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data bulletin cmx615 ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies digital line to pots interface preliminary information features applications pre-programmed tone generators digital line to pots interface fully integrated dtmf encoder subscriber terminal adapters spm generator wireless local loop simple serial control interface computer telephony integration zero-power (1a) standby mode telephone/radio patch systems 3.58mhz xtal/clock pair gain systems bell 202 / v.23 fsk generator billing/spm systems digital ringing voltage generator codec dc-to-dc c caller id ring dial slic analog telephone port digital line circuit cmx615 the cmx615 is an integrated telecom tone generator and dtmf encoder designed for isdn interfaces, wireless local loop and analog to digital telephone conversion systems. the tone generator covers an extensive range of pre-programmed tones used in analog telephone systems (pots). three outputs are provided: ringing signals, in-band tones or fsk data, and 12khz/16khz metering pulses. simple software control facilitates the interface to a wide range of commonly used cs and slics, enabling a comprehensive analog telephone line presentation. the dtmf encoder generates the appropriate dtmf tones for the pots interface. dtmf tone pairs can be encoded along with each tone singly or with other dual tone signals, such as those used in cidcw systems and on hook signaling systems. other tone standards supported are: fax and modem answer and originate, itu (ccitt) r1 and r2 signals, and sufficient tones for simple melody generation. communication to and from the host c is performed by a c-bus serial interface, which is compatible with common serial interfaces such as: sci, spi, and microwire. the cmx615 operates using a 2.7v to 5.5v supply and is available in the following packages: 16-pin soic (CMX615D4) and 16-pin pdip (cmx615p3).
digital line to pots interface 2 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies contents section page 1 block diagram................................................................................................................ 3 2 signal list................................................................................................................... .... 4 3 external components.................................................................................................... 5 4 general description....................................................................................................... 6 4.1 xtal osc and clock dividers ................................................................................................ 6 4.2 uncommitted amplifier ....................................................................................................... .6 4.3 tone/fsk encoder and tone encoder ............................................................................... 6 4.4 spm generator............................................................................................................... ..... 9 4.5 tx signal control ........................................................................................................... ...... 9 4.6 tx uart..................................................................................................................... ....... 10 4.7 c-bus interface........................................................................................................... .... 11 4.8 c-bus registers........................................................................................................... ... 12 5 application notes ........................................................................................................ 12 5.1 telecom tones............................................................................................................... ... 13 6 performance specification.......................................................................................... 17 6.1 electrical performance ...................................................................................................... 17 6.1.1 absolute maximum ratings.................................................................................................. 17 6.1.2 operating limits .......................................................................................................... ......... 17 6.1.3 operating characteristics................................................................................................. .... 18 6.1.4 timing.................................................................................................................... ............... 20 6.2 packaging................................................................................................................... ....... 21 mx-com, inc. reserves the right to change specifications at any time and without notice.
digital line to pots interface 3 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 1 block diagram v dd v bias v ss in+ tx uart status and irq bus 3.58mhz oscillator psu spm generator xtal xtal/clock serial clock command data reply data cs irq c-bus computer serial port m fsk/tones tx registers setup and mode registers status register interrupt generator rom tone encoder tone/fsk encoder tx signal control spm ring tonefsk ampout in- figure 1: block diagram
digital line to pots interface 4 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 2 signal list cmx615 d4/p3 signal description pin no. name type 1 xtal output the output of the on-chip xtal oscillator inverter. 2 xtal/clock input the input to the oscillator inverter from the xtal circuit or external clock source. 3 serial clock input the c-bus serial clock input from the host m c. see section 4.8 4 command data input the c-bus serial data input from the host m c. 5reply data tri-state a 3-state c-bus serial data output to the host m c. this output is high impedance when not sending data to the host m c. 6 cs input chip select. the c-bus transfer control input provided by the host m c. 7 irq output a wire-orable output for connection to a host m c interrupt request input. this output is pulled down to v ss when active and is high impedance when inactive. an external pull-up resistor is required. 8 v ss power the negative supply rail (ground). 9 tonefsk output the sinewave output of the tones and fsk signal generators. 10 spm output the sinewave output of the spm signal generator. 11 v bias output an internally generated bias voltage of v dd /2, except when the device is in zero power mode when v bias will discharge to v ss . it should be bypassed to v ss by a capacitor mounted close to the device pins. 12 in+ input the non-inverting input to the uncommitted amplifier. 13 in- input the inverting input to the uncommitted amplifier. 14 ampout output the output of the uncommitted amplifier. 15 ring output the squarewave output of the ringing signal generator. 16 v dd power the positive supply rail. levels within the device are proportional to this voltage. it should be bypassed to v ss by a capacitor mounted close to the device pins. it is recommended that the printed circuit board is laid out with a ground plane in the cmx615 area to provide a low impedance connection between the v ss pin and the v dd and v bias bypass capacitors. table 1: signal list
digital line to pots interface 5 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 3 external components 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 xtal/clock xtal irq serial clock reply data command data cs ring ampout in- v bias in+ tonefsk x1 r1 c1 c2 c3 c4 v ss v dd v dd v dd cmx615 spm figure 2: recommended external components r1 100k : c1, c2 18pf c3, c4 1.0f x1 3.579545 mhz resistors 5%, capacitors 10% unless otherwise stated. table 2: recommended external components recommended external component notes: 1. resistors 5%, capacitors 10% unless otherwise stated. 2. for best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of v dd , peak to peak. tuning fork crystals generally cannot meet this requirement. to obtain crystal oscillator design assistance, please consult your crystal manufacturer.
digital line to pots interface 6 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 4 general description the cmx615 is a telecom tone generator and dtmf tone encoder. it has separate output ports for the three different classes of signals encoded. these include ringing signal, in-band tones or fsk data at 1200bps, and high frequency metering pulses (spm tones). it has a transmit level attenuator for in-band tones or fsk data and an envelope control for spm tones. it also has an uncommitted amplifier and uses the industry standard 3.58mhz xtal for its oscillator. these functions are controlled over a c-bus serial c interface, which also carries the transmit fsk data. the cmx615 may be powersaved into zero-power mode for minimum power consumption by issuing a c-bus reset command. individual functions may be powersaved by the use of bits 6 and 7 in the setup register. not powersaving the tx powersave (set bit 6 of the setup register to 1) will take the tx functions (tone/fsk encoding, dtmf, spm and ringing signal generation) out of powersave. not powersaving the uncommitted amplifier (set bit 7 of the setup register to 1) will take the amplifier out of powersave. approximately 50ms should be allowed for the tx dc level to settle at v bias before enabling the tx functions (set bit 6 of the mode register to 1). 4.1 xtal osc and clock dividers frequency and timing accuracy of the cmx615 is determined by a 3.579545mhz clock present at the xtal/clock pin. this may be generated by the on-chip oscillator inverter using the external components c1, c2 and x1 of figure 2, or may be supplied from an external source to the xtal/clock input. if the clock is supplied from an external source, c1, c2 and x1 should not be fitted. the on-chip oscillator is turned off in the 'zero-power' mode. if the clock is provided by an external source, which is not always running, then the 'zero-power' mode must be set when the clock is not available. failure to observe this rule may cause a rise in the supply current drawn by cmx615. 4.2 uncommitted amplifier this amplifier, with suitable external components, can be used for adjusting the transmit signal level (for the line hybrid). 4.3 tone/fsk encoder and tone encoder when bit 5 of the mode register is set to 1 then these blocks generate fsk signals as determined by bit 0 of the setup register and the tx data bits from the uart block, as shown in the table below: setup register bit 0 tone/fsk generator fsk signal frequency 0 (space) fsk signal frequency 1 (mark) 0 v23 1200bps fsk 2100hz 1300hz 1 bell 202 1200bps fsk 2200hz 1200hz table 3: tone/fsk encoder and tone encoder when bit 5 of the mode register is set to 0, these blocks generate single or dual tones from the range shown in table 4, table 5, table 6, and table 7 on the following pages. bit 6 of the mode register is then used to enable or disable the blocks output to the tx signal control, ring, and tonefsk outputs. there are four tone fields addressed by bits 0 and 1 of the mode register.
digital line to pots interface 7 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies tx tones register bits 4-7 frequency tx tones register bits 0-3 frequency d7 d6 d5 d4 (hz) d3 d2 d1 d0 (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 252.4 0 0 0 1 * 17.1 0 0 1 0 268.7 0 0 1 0 * 20.5 0 0 1 1 285.3 0 0 1 1 * 24.9 0 1 0 0 315.5 0 1 0 0 * 34.1 0 1 0 1 330.5 0 1 0 1 * 41.0 0 1 1 0 375.2 0 1 1 0 * 51.2 0 1 1 1 404.3 0 1 1 1 - 1 0 0 0 468.0 1 0 0 0 262.9 1 0 0 1 495.8 1 0 0 1 293.6 1 0 1 0 520.6 1 0 1 0 348.2 1 0 1 1 548.0 1 0 1 1 392.6 1 1 0 0 562.8 1 1 0 0 1600 1 1 0 1 578.4 1 1 0 1 1633 1 1 1 0 595.0 1 1 1 0 1827 1 1 1 1 612.5 1 1 1 1 587.2 table 4: tone field 0, mode register bit 1 and bit 0 = 0 and 0 respectively note: * these outputs are routed to the ring digital output instead of the tonefsk output. any single tone output level at tonefsk output is 0dbm. tx tones register bits 4-7 frequency tx tones register bits 0-3 frequency d7 d6 d5 d4 (hz) d3 d2 d1 d0 (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 120 0 0 0 1 330 0 0 1 0 150 0 0 1 0 416 0 0 1 1 154 0 0 1 1 420 0 1 0 0 250 0 1 0 0 425 0 1 0 1 300 0 1 0 1 433 0 1 1 0 350 0 1 1 0 440 0 1 1 1 360 0 1 1 1 450 1 0 0 0 367 1 0 0 0 460 1 0 0 1 375 1 0 0 1 480 1 0 1 0 380 1 0 1 0 500 1 0 1 1 383 1 0 1 1 600 1 1 0 0 400 1 1 0 0 620 1 1 0 1 450 1 1 0 1 720 1 1 1 0 475 1 1 1 0 930 1 1 1 1 480 1 1 1 1 - table 5: tone field 1, mode register bit 1 and bit 0 = 0 and 1 respectively
digital line to pots interface 8 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies tx tones register bits 4-7 frequency tx tones register bits 0-3 frequency d7 d6 d5 d4 (hz) d3 d2 d1 d0 (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 700 0 0 0 1 700 0 0 1 0 900 0 0 1 0 900 0 0 1 1 1100 0 0 1 1 1100 0 1 0 0 1300 0 1 0 0 1300 0 1 0 1 1500 0 1 0 1 1500 0 1 1 0 1700 0 1 1 0 1700 0111 - 0111 - 1 0 0 0 950 1 0 0 0 2100 1 0 0 1 1400 1 0 0 1 2225 1 0 1 0 1800 1 0 1 0 - 1 0 1 1 2130 1 0 1 1 2750 1 1 0 0 697 1 1 0 0 1209 1 1 0 1 770 1 1 0 1 1336 1 1 1 0 852 1 1 1 0 1477 1 1 1 1 941 1 1 1 1 1633 table 6: tone field 2, mode register bit 1 and bit 0 = 1 and 0 respectively tx tones register bits 4-7 frequency tx tones register bits 0-3 frequency d7 d6 d5 d4 (hz) d3 d2 d1 d0 (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 540 0 0 0 1 540 0 0 1 0 660 0 0 1 0 660 0 0 1 1 780 0 0 1 1 780 0 1 0 0 900 0 1 0 0 900 0 1 0 1 1020 0 1 0 1 1020 0 1 1 0 1140 0 1 1 0 1140 0111 - 01 11 - 1 0 0 0 1380 1 0 0 0 1380 1 0 0 1 1500 1 0 0 1 1500 1 0 1 0 1620 1 0 1 0 1620 1 0 1 1 1740 1 0 1 1 1740 1 1 0 0 1860 1 1 0 0 1860 1 1 0 1 1980 1 1 0 1 1980 1110 - 11 10 - 1111 - 11 11 - table 7: tone field 3, mode register bit 1 and bit 0 = 1 and 1 respectively
digital line to pots interface 9 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 4.4 spm generator this block operates independently and has its own output pin. it can transmit 12khz or 16khz and is controlled by bit 4 of the setup register. bit 7 of the mode register is used to enable or disable this block. the signal has a rise and fall time each of about 4.5ms. the spm signal rises from the bias level to 0dbm in 16 steps of | 2db magnitude, and falls from 0dbm to bias level in 16 steps of | 2db magnitude. 4.5 tx signal control this block adjusts the amplitude of the fsk transmit signal output level, the level skew between dtmf tones, and the signal routing to the output ports. output signal levels are proportional to v dd . the nominal output signal levels (at 0db attenuation and v dd = 5.0v) are: single tone 0dbm dual tone (per tone) -3dbm dtmf high frequency tone -3dbm dtmf low frequency tone -5dbm fsk signal 0dbm the ring signal is digital: a square wave with amplitude of ? v dd peak to peak. when the ring signal is not selected, the ring output pin is connected to v ss . the level attenuator provides for level adjustment from 0db to -14db in -2db steps. the typical level is determined by bits 2 to 4 of the mode register as shown in table 8. mode register signal level adjustment bit 4 bit 3 bit 2 (db) 000 0 001 -2 010 -4 011 -6 100 -8 101 -10 110 -12 111 -14 table 8: typical level settings as determined by bits 2, 3, and 4 of the mode register
digital line to pots interface 10 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 4.6 tx uart this block connects the c, via the c-bus interface, to the fsk encoder. the block can be programmed to convert transmit data from 8-bit bytes to asynchronous data characters by adding start and stop bits. the transmit data is then passed to the fsk encoder. data to be transmitted should be loaded by the c into the tx data register when the tx data ready bit (bit 6) of the status register goes high. it will then be treated by the tx uart block in one of two ways, depending on the setting of bit 1 of the setup register: if bit 1 of the setup register is 0 (tx sync mode) then the 8 bits from the tx data register will be transmitted sequentially at 1200bps, lsb (d0) first. if bit 1 of the setup register is 1 (tx async mode) then bits will be transmitted as asynchronous data characters at 1200bps according to the following format: one start bit (space) eight data bits (d0-d7) from the tx data register, with the lsb (d0) transmitted first one stop bit (mark) failure to load the tx data register with a new value when required will result in bit 7 (tx data underflow) of the status register being set to 1. if the tx async mode of operation is selected then a continuous mark (1) signal will be transmitted until a new value is loaded into tx data. if the tx sync mode is selected then the byte already in the tx data register will be re-transmitted. figure 3: transmit uart functions (async)
digital line to pots interface 11 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 4.7 c-bus interface this block provides for the transfer of data and control or status information between the cmx615s internal registers and the c over the c-bus serial bus. each 'c-bus' transaction consists of a single register address byte sent from the c, as illustrated in figure 4, which may then be followed by either of: a single data byte sent from the c to be written into one of the cmx615s write only registers, as illustrated in figure 5. a single byte of data read out from one of the cmx615s read only registers, as illustrated in figure 6. data sent from the c on the command data (command data) line is clocked into the cmx615 on the rising edge of the serial clock (serial clock) input. reply data (reply data) sent from the cmx615 to the c is valid when the serial clock is high. the interface is compatible with the most common c serial interfaces such as sci, spi and microwire, and may also be easily implemented with general purpose c i/o pins controlled by a simple software routine. see figure 9 for detailed c-bus timing requirements. cs serial clock command data address (01 hex = reset) = level not important note: the serial clock line may be high or low at the start and end of each transaction. hi-z reply data 7 654 321 0 figure 4: 'c-bus' transactions (single byte from m c) cs serial clock command data address hi-z data to cmx615 reply data 7 654 321 0 7 654 321 0 figure 5: 'c-bus' transactions (one address and one data byte from m c) cs serial clock hi-z address data from cmx615 command data reply data 7 654 321 0 7 654 321 0 figure 6: 'c-bus' transactions (one address byte from m c and one reply byte from cmx615)
digital line to pots interface 12 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 4.8 c-bus registers command data byte (bits 7 - 0) addr register 7 6 5 4 3 2 1 0 $01 reset n/a n/a n/a n/a n/a n/a n/a n/a $d0 setup uncommitted amplifier: 0 = powersave 1 = not powersave tx powersave: 0 = powersave 1 = not powersave reserved set to 0 spm: 0 = 12khz 1 = 16khz reserved set to 0 reserved set to 0 fsk mode: 0 = sync 1 = async fsk mode: 0 = v23 1 = bell 202 $d1 mode spm o/p: 0 = disable 1 = enable tone/fsk: 0 = disable 1 = enable tone/fsk: 0 = tone 1 = fsk tx level: (msb) tx level: tx level: (lsb) tone fields: (msb) tone fields: (lsb) $d3 tx data d7 d6 d5 d4 d3 d2 d1 d0 $d4 tx tones d7 d6 d5 d4 d3 d2 d1 d0 table 9: write only registers reply data byte (bits 7 - 0) addr. register 7 6 5 4 3 2 1 0 $df status fsk mode: fsk tx data underflow fsk mode: fsk tx data ready reserved set to 0 reserved set to 0 reserved set to 0 reserved set to 0 reserved set to 0 reserved set to 0 table 10: read only registers notes: accessing the reset register over the c-bus clears all of the bits in the setup, mode, tx data, tx tones and status registers. this will set the device into the zero power mode. note that this is a single- byte c-bus transaction consisting solely of the address byte value $01. if any of bits 6 or 7 of the status register is 1 then the irq output will be pulled low. reading the status register clears the irq output. bits 6 and 7 of the status register are cleared on writing to the tx data register. 5 application notes when using the tone/fsk bit (bit 6) of the mode register, each tone starts from v bias and returns to v bias before ending: tonefsk enable tone / fsk: disable v bias figure 7: tone starting and stopping
digital line to pots interface 13 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies when switching between tones in the same column (bits 4 - 7 or bits 0 - 3) of the tx tones register, the transition will be phase continuous. however, switching to the off state will immediately take the output of that tone generator to v bias . tonefsk tone 1 tone 2 tone = off v bias figure 8: tone changing tx tones register codes that do not have a frequency allocated are indicated by a dash (-) in the tone field tables. these values should not be used. 5.1 telecom tones the following table provides the hex codes to be programmed into the particular tone field location for various telecommunications systems applications. the tables are not exhaustive, but list the more commonly used tones. single tone (hz) field 0 (hex) dual tone (hz) field 0 (hex) 375.2 $60 375.2+1827 $6e 404.3 $70 404.3+1827 $7e 468 $80 468+1827 $8e 495.8 $90 495.8+1827 $9e 520.6 $a0 520.6+1827 $ae 548 $b0 548+1827 $be 562.8 $c0 562.8+1827 $ce 578.4 $d0 578.4+1827 $de 1633 $0d table 11: on hook 'cpe alert tone' group a (hz) field 0 (hex) group b (hz) field 0 (hex) 252.4 $10 468 $80 268.7 $20 495.8 $90 285.3 $30 520.6 $a0 315.5 $40 562.8 $c0 330.5 $50 595 $e0 375.2 $60 612.5 $f0 table 12: nynex (mraa) - amr alert tones
digital line to pots interface 14 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies (hz) field 1 (hex) off $00 120 $10 150 $20 154 $30 250 $40 300 $50 350 $60 400 $c0 425 $04 440 $06 450 $07 480 $09 500 $0a 600 $0b 620 $0c table 13: single frequency call progress tones additive mixing (hz) field 1 (hex) m ultiplicative m ixing (hz) field 1 (hex) off $00 350+440 $66 400*16.2 $b2 440+480 $f6 400*20 $a3 480+620 $fc 400*25 $94 400+425 $c4 400*33 $85 400+450 $c7 400*40 $76 425+450 $d4 400*50 $67 425+480 $f4 450*25 $e4 120+620 $1c 600*120 $fd 150+450 $27 table 14: dual frequency call progress tones
digital line to pots interface 15 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies (hz) field 2 (hex) off $00 941+1633 $ff 697+1209 $cc 697+1336 $cd 697+1477 $ce 770+1209 $dc 770+1336 $dd 770+1477 $de 852+1209 $ec 852+1336 $ed 852+1477 $ee 941+1336 $fd 941+1209 $fc 941+1477 $fe 697+1633 $cf 770+1633 $df 852+1633 $ef table 15: dual tone multi frequency generation (hz) field 2 (hex) off $00 950 $80 1100 $30 1300 $40 1400 $90 1800 $a0 2100 $08 2225 $09 2130+2750 $bb table 16: special information tones, fax and modem tones and customer premises alert tones
digital line to pots interface 16 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies (hz) field 2 (hex) 700+900 $12 700+1100 $13 900+1100 $23 700+1300 $14 900+1300 $24 1100+1300 $34 700+1500 $15 900+1500 $25 1100+1500 $35 1300+1500 $45 700+1700 $16 900+1700 $26 1100+1700 $36 1300+1700 $46 1500+1700 $56 table 17: ccitt r1 signaling tones forward mode (hz) field 3 (hex) backward mode (hz) field 3 (hex) off $00 off $00 1380+1500 $89 1140+1020 $65 1380+1620 $8a 1140+900 $64 1500+1620 $9a 1020+900 $54 1380+1740 $8b 1140+780 $63 1500+1740 $9b 1020+780 $53 1620+1740 $ab 900+780 $43 1380+1860 $8c 1140+660 $62 1500+1860 $9c 1020+660 $52 1620+1860 $ac 900+660 $42 1740+1860 $bc 780+660 $32 1380+1980 $8d 1140+540 $61 1500+1980 $9d 1020+540 $51 1620+1980 $ad 900+540 $41 1740+1980 $bd 780+540 $31 1860+1980 $cd 660+540 $21 table 18: ccitt r2 signaling tones
digital line to pots interface 17 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 6 performance specification 6.1 electrical performance 6.1.1 absolute maximum ratings exceeding these maximum ratings can result in damage to the device. min. max. unit supply (v dd - v ss ) -0.3 7.0 v voltage on any pin to v ss -0.3 v dd + 0.3 v current into or out of v dd -50 50 ma v ss -50 50 ma any other pin -20 20 ma d4/p3 package min. max. unit total allowable power dissipation at t amb = 25c 800 mw derating above 25c 13 mw/c above 25c storage temperature -55 125 c operating temperature -40 85 c 6.1.2 operating limits correct operation of the device outside these limits is not implied. notes min. max. unit supply (v dd - v ss ) 2.7 5.5 v operating temperature -40 85 c xtal frequency 1 3.575965 3.583125 mhz notes: 1. a xtal frequency of 3.579545mhz 0.1% is required for correct operation.
digital line to pots interface 18 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 6.1.3 operating characteristics for the following conditions unless otherwise specified: v dd = 2.7v at t amb = 25c and v dd = 3.0v to 5.5v at t amb = -40 to +85c, xtal frequency = 3.579545mhz 0.1%, 0dbm corresponds to 775mv rms . notes min. typ. max. unit dc parameters i dd zero-power mode 1, 2 <1.0 m a opamp only, enabled, v dd = 5.0v 11.5ma opamp only, enabled, v dd = 3.3v 1 0.75 ma all enabled, v dd = 5.0v 1 5.0 7.5 ma all enabled, v dd = 3.3v 1 3.0 4.5 ma logic 1 input level 3 70% v dd logic 0 input level 3 30% v dd logic input leakage current (v in = 0 to v dd ), (excluding xtal/clock input) 3 -1.0 +1.0 a output logic 1 level (i oh = 360a) v dd -0.4 v output logic 0 level (i ol = 360a) 0.4 v irq output off' state current (v out = v dd ) 1.0 a fsk encoder and tx uart level at tonefsk pin 4 -1.0 0.0 1.0 dbm twist (mark level with respect to space level) -2.0 0 +2.0 db tx 1200bits/sec (v23 mode) baud rate (set by uart and xtal frequency) 1194 1200 1206 baud mark (logical 1) frequency 1297 1300 1303 hz space (logical 0) frequency 2097 2100 2103 hz tx 1200bits/sec (bell 202 mode) baud rate (set by uart and xtal frequency) 1194 1200 1206 baud mark (logical 1) frequency 1197 1200 1203 hz space (logical 0) frequency 2197 2200 2203 hz tonefsk signal level level at tonefsk pin for: single tone 4 -1.0 0 1.0 dbm dual tone (per tone) 4 -4.0 -3.0 -2.0 dbm dtmf high frequency group 4 -4.0 -3.0 -2.0 dbm dtmf low frequency group 4 -6.0 -5.0 -4.0 dbm output impedance 10.0 k w tone frequency resolution -2.0 2 hz tone output distortion 5 0.8 % spm signal level level at spm pin 4, 6 -1.5 0 1.0 dbm level at spm pin, at t amb 4, 6, 8 -1.0 0 0.5 dbm tone frequency accuracy -14.0 14.0 hz tone output distortion 5 1.2 % output impedance 10.0 k w
digital line to pots interface 19 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies notes min. typ. max. unit uncommitted amplifier open loop gain (input = 1mv rms at 100hz) 60.0 db unity gain bandwidth 5.0 mhz input impedance (at 100hz) 10.0 m w output impedance (open loop) 10.0 k w power-up timing zero-power to reliable signal at ampout, ring, spm, or tonefsk output pins 50 ms xtal/clock input 'high' pulse width 7 100 ns 'low' pulse width 7 100 ns input impedance (at 100hz) 1.0 m w gain (input = 1mv rms at 100hz) 20.0 db operating characteristics notes: 1. at 25 c, not including any current drawn from the cmx615 pins by external circuitry other than x1, c1 and c2. 2. all logic inputs at v ss except for cs input, which is at v dd . 3. excluding xtal/clock pin. 4. at v dd = 5.0v, load resistance greater than 40k w , signal levels are proportional to v dd . 5. frequency above 300hz. 6. spm has a soft rise and fall time of about 4.5ms. the level changes between v bias and 0dbm in 2db steps, 16 steps per rise and fall. when spm is disabled, an extra 4.5ms falling tail end of signal should be taken into consideration. 7. timing for an external input to the xtal/clock pin. 8. over the range v dd = 3.0v to 5.5v at t amb = 25 c
digital line to pots interface 20 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 6.1.4 timing c-bus timings (see figure 9) notes min. typ. max. unit t cse cs -enable to clock-high time 100 ns t csh last clock-high to cs -high time 100 ns t loz clock-low to reply output enable time 0.0 ns t hiz cs -high to reply output 3-state time 1.0 s t csoff cs -high time between transactions 1.0 s t nxt inter-byte time 500 ns t ck clock-cycle time 500 ns t ch serial clock-high time 200 ns t cl serial clock-low time 200 ns t cds command data set-up time 75 ns t cdh command data hold time 25 ns t rds reply data set-up time 75 ns t rdh reply data hold time 0 ns note: these timings are for the latest version of the c-bus as embodied in the cmx615, and allow faster transfers than the original c-bus timings provided in mx-com's publication doc. # 20480060.001. cs hi-z = level not important or undefined serial clock t cse t nxt t ck t cl t cds t rds t cdh t rdh 70% v dd 30% v dd t ch t ck t csoff t csh t hiz t loz command data command data serial clock reply data reply data 76543 21 0 76543 21 0 76543 21 0 figure 9: 'c-bus' timing
digital line to pots interface 21 cmx615 preliminary information ? 1999 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480196.002 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies 6.2 packaging pin 1 a b alternative pin location marking x p j y c k h e l t w z note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e h typ. max. min. dim. j p x w t y k l 0.105 (2.67) 0.093 (2.36) 0.419 (10.64) 45 7 0 10 0.050 (1.27) 0.041 (1.04) 0.413 (10.49) 0.299 (7.59) 0.050 (1.27) 0.016 (0.41) 0.390 (9.90) 0.020 (0.51) 0.003 (0.08) 0.009 (0.23) 0.0125 (0.32) 0.013 (0.33) 0.020 (0.51) 0.395 (10.03) 0.286 (7.26) z 5 5 figure 10: 16-pin soic (d4) mechanical outline: order as part no. CMX615D4 package tolerances note : all dimensions in inches (mm.) angles are in degrees typ. max. min. a b c e e1 h dim. j j1 p y t k l 0.200 (5.06) 0.262 (6.63) 0.390 (9.91). 7 0.150 (3.81) 0.810 (20.57) 0.135 (3.43) 0.100 (2.54) 0.121 (3.07) 0.300 (7.62) 0.290 (7.37) 0.325 (8.26) 0.015 (0.38) 0.070 (1.77) 0.008 (0.20) 0.015 (0.38) 0.014 (0.35) 0.023 (0.58) 0.040 (1.02) 0.065 (1.65) 0.056 (1.42) 0.064 (1.63) 0.740 (18.80) 0.240 (6.10) b a pin 1 e y e1 t k h j1 j c p l figure 11: 16-pin pdip (p3) mechanical outline: order as part no. cmx615p3

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