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| page 1 of 11
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) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! general description the zx76-31-sp+ is a 50 7 rf digital step attenuator that offers an attenuation range up to 31 db in 1.0 db steps. the control is a 5-bit serial interface. the model operates on a single +3 volt supply. see application note an-70-004 for 5v supply voltage. the zx76-31-sp+ is produced using a unique case package for rug- gedness and operation in tough environments. digital step attenuator 31 db, 1 db step, 5 bit, serial control interface, single supply voltage 50 dc-2400 mhz simpli?ed schematic digital serial control rf input 16db 8db 4db 2db 1db rf out rev. b m113397 zx76-31-sp+ edr-7814 090423 page 1 of 11 product features ? low insertion loss ? high ip3, +52 dbm typ ? excellent return loss, 20 db typ ? excellent accuracy, 0.1 db typ ? single supply voltage: +3v ? control inputs buffered by schmitt triggers ? rigid unibody case ? protected by us patent 6,790,049 typical applications ? lab ? instrumentation ? test equipment connectors order p/n price qty. sma ZX76-31-SP-S+ $73.95 ea. (1-9) zx76-31-sp+ case style: hk1172 + rohs compliant in accordance with eu directive (2002/95/ec) the +suf?x has been added in order to identify rohs compliance. see our web site for rohs compliance methodologies and quali?cations. digital step attenuator zx76-31-sp+ page 2 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! rf electrical speci?cations, dc-2400 mhz, t amb =25c, v dd =+3v absolute maximum ratings parameter ratings operating temperature -40c to 85c storage temperature -55c to 100c v dd , supply voltage -0.3v min., 4v max. voltage on control input -0.3v min., 6v max. esd, hbm 500v esd, mm 100v input power +24dbm parameter min. typ. max. units v dd , supply voltage 2.7 3 3.3 v i dd ,supply current 1.5 ma control input voltage low 0 0.3xv dd v control input voltage high 0.7xv dd 5vv control current 400 m a dc electrical speci?cations parameter min. typ. max. units switching speed, 50% control to 0.5db of attenuation value 1.0 m sec switching control frequency 25 khz switching speci?cations * ip3 and 1db compression degrade below 1 mhz parameter freq. range (ghz) min. typ. max. units accuracy @ 1 db attenuation setting dc-1 0.02 0.1 db 1-2.4 0.05 0.15 db accuracy @ 2 db attenuation setting dc-1 0.05 0.15 db 1-2.4 0.15 0.25 db accuracy @ 4 db attenuation setting dc-1 0.07 0.2 db 1-2.4 0.15 0.25 db accuracy @ 8 db attenuation setting dc-1 0.03 0.2 db 1-2.4 0.15 0.3 db accuracy @ 16 db attenuation setting dc-1 0.1 0.3 db 1-2.4 0.15 0.5 db insertion loss @ all attenuator set to 0db dc-1 1.5 2.2 db 1-2.4 2.0 3.0 db ip3 input* (at min. and max. attenuation) dc-2.4 +52 dbm input power @ 0.2db compression* (at min. and max. attenuation) dc-2.4 +24 dbm vswr dc-1 1.2 1.5 1-2.4 1.2 1.5 digital step attenuator zx76-31-sp+ page 3 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! pin description pin con?guration j2 j3 p2 p1 gnd +vdd rf out rf in j2 j3 side view top view j1-10 j1-1 j1 cable pin description function pin number description n/c j1-1 not connected gnd j1-2 ground connection le j1-3 latch enable input n/c j1-4 not connected gnd j1-5 ground connection n/c j1-6 not connected clock j1-7 serial interface clock input gnd j1-8 ground connection data j1-9 serial interface data input n/c j1-10 not connected rf in j2 rf in port (note 1) rf out j3 rf out port (note 1) gnd p1 ground connection v dd p2 positive supply voltage note 1: both rf ports must be held at 0vdc or dc blocked with an external series capacitor. j1 j4 j1-pin number j4-pin number function description wire color j1-2 j4-18 gnd ground connection black j1-3 j4-4 le latch enable input green j1-5 j4-19 gnd ground connection blue j1-7 j4-2 clock serial interface clock input red j1-8 j4-20 gnd ground connection orange j1-9 j4-3 data serial interface data input white note: other pins not connected. cable shield connected to case ground. digital step attenuator zx76-31-sp+ page 4 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! typical performance curves insertion loss (ref) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) insertion loss (db) -40oc +25oc +85oc attenuation (1 db) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) attenuation (db) -40c +25c +85c attenuation (2 db) 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) attenuation (db) -40c +25c +85c attenuation (4 db) 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) attenuation (db) -40c +25c +85c attenuation (8 db) 7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) attenuation (db) -40c +25c +85c attenuation (16 db) 14.0 14.5 15.0 15.5 16.0 16.5 17.0 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) attenuation (db) -40c +25c +85c digital step attenuator zx76-31-sp+ page 5 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! typical performance curves zx76-31-sp+ return loss in (ref) 0 5 10 15 20 25 30 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) return loss (db) -40c +25c +85c return loss out (ref) 0 5 10 15 20 25 30 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) return loss (db) -40c +25c +85c return loss in (major atten. steps) @ +25 o c 10 20 30 40 50 60 70 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) return loss (db) 0 db 1 db 2 db 4 db 8 db 16 db 31 db return loss out (major atten. steps) @ +25 o c 10 20 30 40 50 60 70 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) return loss (db) 0 db 1 db 2 db 4 db 8 db 16 db 31 db attenuation (31 db) 20 22 24 26 28 30 32 34 0 500 1000 1500 2000 2500 3000 3500 4000 frequency (mhz) attenuation (db) -40c +25c +85c digital step attenuator zx76-31-sp+ page 6 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! typical performance curves ip3 (major atten. steps) @ +25 o c 35 40 45 50 55 60 65 70 75 80 0 400 800 1200 1600 2000 2400 frequency (mhz) ip3 (dbm) 0 db 1 db 2 db 4 db 8 db 16 db 31 db compression @ input power=+24dbm (major atten. steps) @ +25 o c -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0 400 800 1200 1600 2000 2400 frequency (mhz) compression (db) 0 db 1 db 2 db 4 db 8 db 16 db 31 db ip3 (major atten. steps) @ -40 o c 35 40 45 50 55 60 65 70 75 80 0 400 800 1200 1600 2000 2400 frequency (mhz) ip3 (dbm) 0 db 1 db 2 db 4 db 8 db 16 db 31 db compression @ input power=+24dbm (major atten. steps) @ -40 o c -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0 400 800 1200 1600 2000 2400 frequency (mhz) compression (db) 0 db 1 db 2 db 4 db 8 db 16 db 31 db ip3 (major atten. steps) @ +85 o c 35 40 45 50 55 60 65 70 75 80 0 400 800 1200 1600 2000 2400 frequency (mhz) ip3 (dbm) 0 db 1 db 2 db 4 db 8 db 16 db 31 db compression @ input power=+24dbm (major atten. steps) @ +85 o c -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0 400 800 1200 1600 2000 2400 frequency (mhz) compression (db) 0 db 1 db 2 db 4 db 8 db 16 db 31 db digital step attenuator zx76-31-sp+ page 7 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! outline drawing recommended mounting hardware: use unc#2 pan head screws with internal tooth lock washers for unit mounting. outline dimensions ( ) inch mm a bcdefghj klmnpqrs wt. grams 1.20 .75 .46 1.18 .04 .17 .45 .59 .33 .21 .22 .18 1.00 .50 .35 .18 .106 35 30.5 19.1 11.6 30.0 1.0 4.3 11.4 14.9 8.3 5.3 5.6 4.6 25.4 12.7 8.9 4.6 2.69 digital step attenuator zx76-31-sp+ page 8 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! simpli?ed schematic the zx76-31-sp+ serial interface consists of 5 control bits that select the desired attenuation state, as shown in table 1: truth table digital serial control rf input 16db 8db 4db 2db 1db rf out le clock data msb lsb t lesup t sdsup t sdhld t lepw figure 1: serial interface timing diagram table 2. serial interface ac characteristics symbol parameter min. max. units f clk serial data clock frequency (note 1) 10 mhz t clkh serial clock high time 30 ns t clkl serial clock low time 30 ns t lesup le set-up time after last clock falling edge 10 ns t lepw le minimum pulse width 30 ns t sdsup serial data set-up time before clock rising edge 10 ns t sdhld serial data hold time after clock falling edge 10 ns note 1. fclk veri?ed during the functional pattern test. serial programming sections of the functional pattern are clocked at 10mhz to verify fclk speci- ?cation. the serial interface is a 5-bit serial in, parallel-out shift register buffered by a transparent latch. it is controlled by three cmos-compatible signals: data, clock, and latch enable (le). the data and clock inputs allow data to be serially entered into the shift register, a process that is independent of the state of the le input. the le input controls the latch. when le is high, the latch is transparent and the contents of the serial shift register control the attenuator. when le is brought low, data in the shift register is latched. the shift register should be loaded while le is held low to prevent the attenuator value from changing as data is entered. the le input should then be toggled high and brought low again, latching the new data. the timing for this operation is de?ned by figure 1 (serial interface timing diagram) and table 2 (serial interface ac characteristics). table 1. truth table attenuation state c16 c8 c4 c2 c1 reference 0 0000 1 (db) 0 0001 2 (db) 0 0010 4 (db) 0 0100 8 (db) 0 1000 16 (db) 1 0000 31 (db) 1 1111 note: not all 32 possible combinations of c1 - c16 are shown in table control cables for programming and cd with software can be ordered separately. for details see page 10. digital step attenuator zx76-31-sp+ page 9 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! the zx76-31-sp+, uses a common 5-bit serial word format, as shown in table 3: 5-bit attenuator serial programming register map. the ?rst bit, the msb, corresponds to the 16-db step and the b1 bit corresponds to the 1 db step. table 3. 5-bit attenuator serial programming register map b5 b4 b3 b2 b1 b0 c16 c8 c4 c2 c1 0 msb (?rst in) lsb (last in) note: the stop bit (b0) must always be low to prevent the attenuator from entering an unknown state. digital step attenuator zx76-31-sp+ page 10 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! recommended accessories two optional cable accessories with and without interface connector are available with zx76-31-sp+, the zx76-cs+ and zx76-ws+. zx76-cs+ shielded cable with interface 25 pin d-type connector j4 and supplied software are used to control the zx76-31-sp+ digital attenuator from a computer, using lpt port. zx76-ws+ shielded cable without interface 25 pin d-type connector enables customer to use the zx76-31-sp+ digital attenuator in his own application. cable length is 4.9 feet / 1.5 meters. note : mini-circuits can supply control cables with other options for the j4 connector and/or different cable lengths. consult factory with your speci?c requirements. zx76-cs+ control cable zx76-cs+ wiring information j1 j4 j1-pin number j4-pin number function description wire color j1-2 j4-18 gnd ground connection black j1-3 j4-4 le latch enable input green j1-5 j4-19 gnd ground connection blue j1-7 j4-2 clock serial interface clock input red j1-8 j4-20 gnd ground connection orange j1-9 j4-3 data serial interface data input white note: other pins not connected. cable shield connected to case ground. digital step attenuator zx76-31-sp+ page 11 of 11 ' . ) ' ' # $ / & - ' ) # . ' ) + " $ ( ) ' ) % & * ( * * ! ' ( ( " & ' & $ " & * " & " " ) , " + * - * " + # # # " ! ordering information j1-pin number function description wire color j1-2 gnd ground connection black j1-3 le latch enable input green j1-5 gnd ground connection blue j1-7 clock serial interface clock input red j1-8 gnd ground connection orange j1-9 data serial interface data input white zx76-ws+ wiring information model number description quantity min. no. of units price $ ea. ZX76-31-SP-S+ digital attenuator - serial interface single positive supply voltage 1-9 73.95 zx76-cs+ cable accessory with interface connector 1 22.95 zx76-ws+ cable accessory without interface connector 1 15.95 zx76-cd* cd rom zx76 programming software 1 no charge *note: to receive the cd, request when placing order. j1 zx76-ws+ control cable note: other pins not connected. cable shield connected to case ground. |
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