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description the CXA1917AM/as is a bipolar ic designed for use in the dolby s type noise reduction system (nr). an external operational amplifier is required to configure the decoder. the stereo dolby b-c-s type nr combines use of a cxa1563m/s and two CXA1917AM/as ics. features considerable reduction in the number of external parts (half compared to cxa1417s/q) the same dolby level as that of cxa1560 series ics (?dbm) structure bipolar silicon monolithic ic absolute maximum ratings (ta = 25?) supply voltage v cc to v ee 17 v operating temperature topr ?0 to +75 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d (CXA1917AM) 600 mw (cxa1917as) 1200 mw recommended operating conditions supply voltage v cc 4.5 to 6.5 v v ee ?.5 to ?.5 v ?1 CXA1917AM/as e95y15c27 dolby ? s type noise reduction processor sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustr ating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. 30 pin sop (plastic) 30 pin sdip (plastic) ? this ic is available only to the licensees of dolby laboratories licensing corporation from whom licensing and applications information may be obtained. ? "dolby" and the double d symbols are trademarks of dolby laboratories licensing corporation.
?2 CXA1917AM/as block diagram and pin configuration (encoder unit) c30 2.2n c25 39n r31 13k 2% r34 1.5k r30 8.2k 2% r27 10k 2% c34 8.2n c40 47n c42 0.22 10% r28 24k 2% c44 0.1 c45 0.47 10% c48 0.1 10% c46 0.22 10% c43 0.47 10% c41 0.1 c31 8.2n c29 470p gnd recout gnd input mc mc4 mc3 mc1 20k 15k 17.5k 20k antsat flvcr slvcr v to i conv h sldet slicg fldet flicg shdet v to i conv h shvcr fhvcr fhdet fhicg shicg v ref & i ref lfdet lfvcr lficg v ee v cc vct vct vct vct vct r12 10k c14 100n c8 22n r9 39k vct r26 18k 2% 39k 2% c27 680p r24 10k 2% c24 39n c26 1 10% c23 0.22 c20 22n r16 39k 2% c17 100n c7 100n c16 0.22 c21 1.8n vct r20 5.1k 2% r14 16k 2% c11 100n r15 2.4k 2% r10 27k 2% c19 1.8n 5 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 6 7 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 1 3 4 r25 33 r45 47 r47 33 r46 33 r48 47 hlsmp mctc zhsh zl2 lfin tcl1 tcl2 scinh fboh tcf1h tcf2h tcs2h tcs1h vct v ee mc4in mc3in mcbo hlsout zhsl recout scinl scbol fbol tcs1l tcs2l tcf1l tcf2l iref v cc c38 1 mc4 mc3ds mc3dt mc2 mc1 vct r19 note) split supply: short vct to gnd single supply: short gnd to v ee and open vct tolerances of resistors are 5% without otherwise specified tolerances of film capacitors are 5% without otherwise specified tolerances of chemical capacitors are 20% without otherwise specified
3 CXA1917AM/as pin description (dcv values are for vcc = 6.0v and v ee = 6.0v.) pin no. symbol dcv (v) equivalent circuit description 1 hlsmp 0 hls main path input 2 mctc 3.9 time constant for the mc2 3 zhsh 0 dc cut capacitance for the hls/hf/sb detector 4 zl2 0 hf/lf/fb pass band rectifier input v cc v ee 1 v cc v ee 1.5k 9.2k 2p 2 v cc v ee 2.6k 3 v cc gnd 16k vct 4
4 CXA1917AM/as 5 lfin 0 hls/lf/fb-stage input 6 tcl1 4.6 primary time constant for the hls/lf/fb detector 7 tcl2 4.6 secondary time constant for the hls/lf/fb detector 8 scinh 0 hls/hf side chain input v cc gnd 5 10.2k v cc 1.5k 6 68k v ee v cc 124k v ee 7 300k v cc v ee 500 500 8 pin no. symbol dcv (v) equivalent circuit description
5 CXA1917AM/as 9 fboh 0 hls/hf/fb vcr output 22 fbol 0 lls/hf/fb vcr output 10 tcf1h 0 primary time constant for the hls/hf/fb detector 22 v cc gnd 1.6k 5.1k 9 vct v cc 80k v ee 10 18 v cc 22k v ee 340k 11 20 v cc 46k v ee 364k 2k 4k 12 11 tcf2h 4.6 secondary time constant for the hls/hf/fb detector 18 tcf2l 4.6 secondary time constant for the lls/hf/fb detector 12 tcs2h 4.6 secondary time constant for the hls/hf/sb detector 20 tcs2l 4.6 secondary time constant for the lls/fb/sb detector pin no. symbol dcv (v) equivalent circuit description
6 CXA1917AM/as 13 tcs1h 4.6 primary time constant for the hls/hf/sb detector 14 vct 0 for dual power supply: ground for single power supply: vct v cc 80k v ee 26k 13 v cc gnd 500 500 2k 14 v cc 1.5k v ee 17 15 v ee 6.0 for dual power supply: negative power supply for single power supply: ground 16 v cc 6.0 positive power supply 17 iref 4.8 reference current input v cc v ee 1.5k 80k 19 19 tcf1l 4.6 primary time constant for the lls/hf/fb detector pin no. symbol dcv (v) equivalent circuit description
7 CXA1917AM/as 21 tcs1l 4.6 primary time constant for the lls/hf/sb detector 23 scbol 0 lls/hf side chain buffer amplifier output v cc v ee 86k 21 70k v cc v ee 500 500 500p 1.64meg 23 24 v cc v ee 200 200 20p 17.5k 20k 20k 500 500 47p 2k 28 25 v cc v ee 3.6k 26 25 recout 0 recording (encoding) output 28 mcbo 0 mc buffer feedback 24 scinl 0 lls/hf side chain input 26 zhsl 0 dc cut capacitance for the lls/hf/sb detector pin no. symbol dcv (v) equivalent circuit description
8 CXA1917AM/as 27 hlsout 0 hls output 29 mc3in 0 mc3 input 30 mc4in 0 mc4 input 47p 20k v cc v ee 500 500 11k 26 27 22k v cc v ee 22k 29 v cc v ee 30 pin no. symbol dcv (v) equivalent circuit description
9 CXA1917AM/as electrical characteristics (ta = 25 c, dolby level: 6dbm (= 388mvrms) at encoder input, vcc = +6v, v ee = 6v) characteristics symbol measurement conditions f (khz) input other min. typ. max. unit operating voltage current consumption encoding characteristics (boost) (1) (2) (3) (4) (5) (6) (7) (8) signal handling total harmonic distortion s/n ratio v opr i cc eb-1 eb-2 eb-3 eb-4 eb-5 eb-6 eb-7 eb-8 vomax thd snr 1 2 0.05 0.3 12 0.3 2 0.05 12 1 1 15db 60 40 40 40 20 20 0 0 0 thd 1% no signal thd = 1% rg = 600 ? ccir/arm 4.5 10.0 22.0 5.9 15.0 12.8 6.7 4.4 2.9 7.3 14.0 62.0 15.0 23.5 7.4 16.5 14.3 8.2 5.9 1.4 5.8 16.0 0.01 65.0 6.5 20.0 25.0 8.9 18.0 15.8 9.7 7.4 0.1 4.3 0.15 v ma db db db db db db db db db % db
10 CXA1917AM/as electrical characteristics measurement circuit hlsmp mctc zhsh zl2 lfin tcl1 tcl2 scinh fboh tcf1h tcf2h tcs2h tcs1h vct v ee mc4in mc3in mcbo hlsout zhsl recout scinl scbol fbol tcs1l tcs2l tcf1l tcf2l iref v cc c30 2.2n c25 39n r31 13k r34 1.5k r30 8.2k r27 10k c34 8.2n 2 3 1 c40 47n c42 0.22 r28 24k c44 0.1 c45 0.47 c48 0.1 c46 0.22 c43 0.47 c41 0.1 c31 8.2n c26 1 c23 0.22 r26 18k c27 680p r24 10k c24 39n r19 39k c20 22n r16 39k c17 100n c7 100n c16 0.22 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 c19 1.8n c21 1.8n r20 5.1k r15 2.4k r14 16k r10 27k c11 100n 16 17 18 19 20 21 22 23 24 26 27 28 29 30 r12 10k c29 470p r9 39k c8 22n c14 100n v cc (+6v) gnd v ee ( 6v) a signal genarator distortion anaryzer ccir/arm noise meter 25 r23 33 c38 1
11 CXA1917AM/as application circuit hlsmp mctc zhsh zl2 lfin tcl1 tcl2 scinh fboh tcf1h tcf2h tcs2h tcs1h vct v ee mc4in mc3in mcbo hlsout zhsl recout scinl scbol fbol tcs1l tcs2l tcf1l tcf2l iref v cc c30 2.2n c25 39n r31 13k r34 1.5k r30 8.2k r27 10k c34 8.2n 2 3 5 6 7 1 c40 47n c42 0.22 r28 24k c44 0.1 c45 0.47 c48 0.1 c46 0.22 c43 0.47 c41 0.1 c31 8.2n c26 1 c23 0.22 r26 18k c27 680p r24 10k c24 39n r19 39k c20 22n r16 39k c17 100n c7 100n c16 0.22 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 c19 1.8n c21 1.8n r20 5.1k r15 2.4k r14 16k r10 27k c11 100n 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 r12 10k r9 39k c8 22n lineout ( 6dbm) recout ( 6dbm) v cc (+6v) gnd v ee ( 6v) input ( 25dbm) r5 12k r4 12k c1 4.7 r1 22k r3 1.5k r2 1.5k c2 33 c3 33 decode encode c9 4.7 c4 4.7 c29 470p c14 100n r25 33 r45 47 r47 33 r46 33 r48 47 c38 1 application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility fo r any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same .
12 CXA1917AM/as notes on application the cxa1917a is an encoding ic for the dolby s type (nr). an external operational amplifier is required to configure the decoder circuit. the dolby level voltage of this ic is designed to be 6dbm (388mvrms), which is the same as that of the cxa1562 and cxa1563 dolby b-c type ics. therefore, it is possible to use the cxa1562 or the cxa1563 to configure a b-c-s type switchable processor. the b-c-s type switchable processor can be configured without requiring an external operational amplifier because the cxa1563 has a built-in s-type changeover switch. power supply the cxa1917a will operate with either dual or single power supply. connect vct pin to gnd pin when dual power supply is used. connect v ee pin to gnd pin and open vct pin when a single power supply is used. the power supply half the vcc generated inside the ic is generated at vct pin. the supply voltage range is from 4.5v to 6.5v and from 9v to 13v for dual and single power supplies, respectively. note, however, that the minimum supply voltage is determined by the maximum voltage amplitude of external operational amplifier. because general-purpose operational amplifiers have the maximum voltage amplitude of approximately (vcc v ee ) 2v, actual minimum supply voltages, which satisfy the 15db overload margin, are 5.0v and 10v for dual and single power supplies, respectively. the supply current does not depend so much on the supply voltage, but does depend on the signal level and frequency. the maximum supply current in the worst case is approximately 25ma. recording processor fig. 1 shows the recording processor. the gain is defined as follows: grec20 log (1 + r62/r63) ...... (1) the processor in fig. 1 has a gain of 14db, therefore, input sensitivity is 20dbm (77.5mvrms). an input sensitivity higher than 25dbm (44mvrms) is generally unacceptable due to noise performance, although this is affected by the operational amplifier in the input circuit. an important characteristic for the external operational amplifier is the noise performance for approximately an input impedance of 20k ? . a bipolar input type will be better than the jfet input type for the recording processor. playback processor fig. 2 shows the playback processor. the gain is defined as follows: gpb20 log (1 + r64/r65) ...... (2) the processor in fig. 2 has a gain of 20db, therefore, the input sensitivity is 26dbm (39mvrms). important characteristics of the playback processor are the frequency response and the feedback loop stability, which depend on the gain of the feedback loop gain and the slew rate of the external operational amplifier. the slew rate has to be higher than 3v/s. the loop gain can be estimated using the gain bandwidth product bg (hz) of the operational amplifier and the decode gain apb. the lower limit of bg/apb is approximately 500khz, and the recommended range is from 1 to 3mhz. switchable processor fig. 3 shows the switchable processor. the gains are the same as in equations (1) and (2). an operational amplifier is required with low noise, average slew rate (> 3v/s), and wide bandwidth ( 10mhz) for this gain setting. a bipolar input type operational amplifier with a wide bandwidth like those of the 4560 and the 4570 is required of the switchable processor. the processor in fig. 3 may generate a significant switching noise, especially when s2 switch is make-break- make type. when s2 switch is a make-to-make type or has a quick switching feature, the switching noise will be within the range acceptable for cassette decks with output muting circuits.
13 CXA1917AM/as 5 7 6 7 5 gnd recout gnd input 2 3 4 1 1 2 3 4 v cc v ee vct v cc gnd v ee vct encoder unit gnd vct r62 12k r63 3k r61 56k c61 4.7 c62 4.7 c63 2.2 lineout ( 6dbm) recout ( 6dbm) recin ( 20dbm) 6 a1 fig. 1. recording processor 7 8 recout gnd input encoder unit gnd vct r65 2k r61 22k c62 4.7 c64 2.2 lineout ( 6dbm) pbin ( 26dbm) r64 18k 5 6 6 a1 2 3 4 1 1 2 3 4 v cc v ee vct v cc gnd v ee vct gnd fig. 2. playback processor 5 7 6 6 7 5 recout gnd input encoder unit gnd vct r61 56k c61 10 c62 10 lineout ( 6dbm) recout ( 6dbm) pbin ( 26dbm) 8 recin ( 20dbm) c63 2.2 r65 2k r63 3k r62 12k s2 s1 a1 gnd 2 3 4 1 1 2 3 4 v cc v ee vct v cc v ee vct gnd r64 18k fig. 3. switchable processor b-c-s type switchable stereo processor fig. 4 shows the stereo processor switchable to any b-c-s type mode. the operational amplifier is unnecessary, because the cxa1563 is used for a b-c type processor and s-type changeover switch is built in the ic. it is recommended that the s type mode be used for recording level calibration.
14 CXA1917AM/as 11 12 13 14 vct linein1 lineout1 pbin1 sin1 mode recout1 v cc linein2 lineout2 pbin2 sin2 ssw nrsw recout2 gnd 15 16 18 21 22 26 27 28 11 12 13 14 7 2 3 8 4 3 2 24 23 22 21 pbin1 linein2 pbin2 linein1 v cc v ee vct gnd line out1 rec out1 gnd gnd c off b s b/c mpx off pb mpx on c16 1 c13 1 c12 1 c11 1 c22 1 c21 1 c26 1 c23 1 vct gnd gnd 5 7 2 3 4 1 6 v cc gnd v ee vct recout gnd input encoder unit 2 5 7 3 4 1 6 v cc gnd v ee vct recout gnd input encoder unit 1 2 1 gnd lineout2 recout2 cxa1563 fig. 4. b-c-s switchable stereo processor
15 CXA1917AM/as example of representative characteristics current consumption vs. supply voltage v cc v ee supply voltage [ma] 8 10121416 i cc current consumption [ma] 12 14 16 18 no signal overload margin vs. supply voltage v cc v ee supply voltage [v] 8 10121416 overload margin [db] 10 15 20 v cc = +6v v ee = 6v 0db = 6dbm f = 1khz overload margin: encoding input level when 1% of total harmonic distortion is generated at the encoding output current consumption vs. input level encoding input level [db] 10 0 10 i cc current consumption [ma] 12 14 16 18 v cc = +6v v ee = 6v 0db = 6dbm 10khz 1khz 100hz total harmonic distortion characteristics output level [db] 10 total harmonic distortion [%] 0.01 1khz 100hz 50 51015 0.1 1.0 encoding characteristics frequency [hz] 30k encoding boost [db] 10 v cc = +6v v ee = 6v 0db = 6dbm 10k 3k 1k 300 100 30 25 20 15 10 5 0 5 ripple rejection frequency [hz] 30k ripple rejection [db] 40 v cc v ee = 12v vripple = 20dbm encode mode 10k 3k 1k 300 100 30 30 20 10 v cc (single supply) c = 47 (14pin) v cc (dual supply) v ee (dual supply) 20 60db 50db 40db 30db 20db 10db 0db +10db v cc = +6v v ee = 6v 0db = 6dbm 10khz
16 CXA1917AM/as package outline unit: mm CXA1917AM 0.45 0.1 1 1.27 15 7.6 ?0.1 + 0.3 10.3 0.4 16 30 18.8 ?0.1 + 0.4 0.2 m 0.1 0.2 ?0.05 + 0.1 0.5 0.2 0.1 ?0.05 a (9.3) 2.3 ?0.15 + 0.4 30pin sop (plastic) sony code eiaj code jedec code sop-30p-l03 sop030-p-0375 package material lead treatment lead material package mass epoxy resin solder plating copper alloy package structure 0.7g 0? to 10? + 0.2 detail a 0.45 0.1 1 1.27 15 7.6 0.1 + 0.3 10.3 0.4 16 30 18.8 0.1 + 0.4 0.2 m 0.1 0.2 0.05 + 0.1 0.5 0.2 0.1 0.05 a (9.3) 2.3 0.15 + 0.4 30pin sop (plastic) sony code eiaj code jedec code sop-30p-l03 sop030-p-0375 package material lead treatment lead material package mass epoxy resin solder plating copper alloy package structure 0.7g 0 ? to 10 ? + 0.2 detail a lead plating specifications item lead material copper alloy solder composition sn-bi bi:1-4wt% plating thickness 5-18 m spec.
17 CXA1917AM/as package outline unit: mm cxa1917as sony corporation sony code eiaj code jedec code 30pin sdip (plastic) 26.9 0.1 + 0.4 15 16 30 1.778 10.16 8.5 0.1 + 0.3 0.25 0.05 + 0.1 0 ? to 15 ? 0.5 0.1 0.9 0.15 3.0 min 0.5 min 3.7 0.1 + 0.4 sdip-30p-01 p-sdip30-8.5x26.9-1.778 1 package structure molding compound lead treatment lead material package mass epoxy resin copper alloy 1.8g 1.all mat surface type. two kinds of package surface: 2.all mirror surface type. solder plating sony code eiaj code jedec code 30pin sdip (plastic) 26.9 0.1 + 0.4 15 16 30 1.778 10.16 8.5 0.1 + 0.3 0.25 0.05 + 0.1 0 ? to 15 ? 0.5 0.1 0.9 0.15 3.0 min 0.5 min 3.7 0.1 + 0.4 sdip-30p-01 p-sdip30-8.5x26.9-1.778 1 package structure molding compound lead treatment lead material package mass epoxy resin copper alloy 1.8g 1.all mat surface type. two kinds of package surface: 2.all mirror surface type. solder plating lead plating specifications item lead material copper alloy solder composition sn-bi bi:1-4wt% plating thickness 5-18 m spec.

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