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?1 CXA2502M e95621b22-ps dolby ? ? b-c type noise reduction system for playback description the CXA2502M is a bipolar ic incorporating stereo dolby b-c type noise reduction (nr) system for playback. pins of this ic are compatible with those of the dolby b type nr ics cxa1102m/ cxa1552m. a reduction in the number of external parts and small package have been achieved due to the fact that the spectral skewing circuits are all on-chip and this ic is intended for playback. features few external parts spectral skewing circuit are on-chip nr off/b/c and aux/tape switches small package (16-pin sop) low current consumption 12ma typ. built-in two channels structure bipolar silicon monolithic ic absolute maximum ratings (ta = 25?) supply voltage v cc 17 v operating temperature topr ?0 to +85 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d 600 (sop) mw 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. 16 pin sop (plastic) ? this ic is available only to the licensees of dolby laboratories licensing corporation from whom licensing and applications information may be obtained. ? ?olby?and the double d symbols are trademarks of dolby laboratories licensing corporation.
?2 CXA2502M block diagram, pin configuration and application circuit hdet hls hls hdet ldet lls lls ldet ssk ssk iref mode control moa moa p12 p11 pbin1 ( 30dbm) auxin1 ( 30dbm) p13 lineout1 ( 6dbm) p1 p23 lineout2 ( 6dbm) v cc c2 10 v cc c21 1 auxin2 c22 1 pbin2 c1 47 vct nrsw c b off c23 1 lineout2 tch2 c24 100n tcl2 c25 68n 2 3 4 5 6 7 8 1 p21 p22 auxin2 ( 30dbm) pbin2 ( 30dbm) c11 1 auxin1 tape aux c12 1 pbin1 gnd iref mode c13 1 lineout1 tch1 c14 100n tcl1 c15 68n r1 20k 9 10 11 12 13 14 15 16 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 .
3 CXA2502M pin description pin no. symbol z (in) vdc (v) equivalent circuit description 3 14 pb in 40k vct playback input. reference level = 30dbm v cc gnd vct 40k 1 16 aux in 40k vct auxiliary input. reference level = 30dbm v cc gnd vct 40k 6 11 line out 0 vct line output. 200 v cc 200 gnd 2 v cc v cc positive power supply. 4 vct 0 vct dual power supply: ground single power supply: vcc/2 5 nrsw nr control high: c type medium:b type low: nr off v cc gnd 22k 50a
4 CXA2502M 7 10 tch 0.4v time constant for the hls. v cc gnd 36k 13k 330k 8 9 tcl 0.4v time constant for the lls. v cc gnd 13.5k 480k 15 gnd gnd dual power supply: negative power supply single power supply: ground 12 mode mode control high: tape low: aux v cc gnd 22k 50a 13 iref 0 1.25v reference current which determines the built-in filter cut-off frequency. v cc gnd 1.25v pin no. symbol z (in) vdc (v) equivalent circuit description
5 CXA2502M electrical characteristics (ta = 25 c, v cc = 9v) characteristics symbol min. p/a nr f (hz) other conditions typ. max. unit operating voltage vopr i cc vlout vlin vpin b-r-1 b-r-2 b-r-3 b-r-4 c-r-1 c-r-2 c-r-3 c-r-4 c-r-5 c-r-6 aux pb pb pb pb pb pb pb pb pb pb pb off off off b b b b c c c c c c 1k 1k 1k 500 5k 10k 10k 500 500 2k 2k 5k 10k no signal 25db 25db 40db 0db 60db 25db 60db 25db 25db 0db 7.2 8.0 7.0 32 32 1.4 3.9 9.7 1.1 14.2 7.2 18.7 5.4 3.5 5.5 12.0 6.0 30 30 2.9 5.4 10.4 0.4 16.2 9.2 20.7 7.4 5.5 3.5 16.0 18.0 5.0 28 28 4.4 6.9 11.4 1.9 18.2 11.2 22.7 9.4 7.5 1.5 v ma dbm dbm dbm db db db db db db db db db db current consumption lineout level aux in level pb in level decode characteristics b type boost (1) (2) (3) (4) c type boost (1) (2) (3) (4) (5) (6) measurement conditions ? signal handling vomax pb off 1k thd = 1% 13.5 16.0 db 1) nr off thd (off) pb off 1k +10db 0.01 0.1 % 2) b thd (b) pb b 1k +10db 0.03 0.1 % 3) c thd (c) pb c 1k +10db 0.04 0.2 % rec-pb pb-rec ch to ch ct-1 ct-2 ct-3 pb aux pb off off off 1k 1k 1k 0db 0db 0db 85 85 68 70 70 60 db db db offset voltage (off-c type) voff pb off c 100 0 100 mv decode s/n ratio sn (ccir) pb c rg = 5k ? (ccir/arm) 75 83 db total harmonic distortion ? 0db means the level which provides 6dbm to the line output when nr is off.
6 CXA2502M electrical characteristics measurement circuit 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 audio sg dc volt meter s12 s11 c11 1 c12 1 c14 100n c15 68n vmode c13 1 s2_1 ccir/arm filter s21 c21 1 s22 c1 100 c22 1 c24 100n vnrsw c23 1 s2_2 audio analyzer a v cc s3 auxin1 gnd pbin1 iref mode lineout1 tch1 tcl1 auxin2 v cc pbin2 vct nrsw lineout2 tch2 tcl2 CXA2502M c25 68n c2 100 r1 20k
7 CXA2502M application note the CXA2502M is a stereo dolby b-c type nr ic like the cxa1560 series. few external parts and smaller package can be achieved because this ic has a built-in spectral skewing circuit and the reduced number of pins for playback. 1) power supply the CXA2502M is designed to operate on either single or dual power supply. for dual power supply, connect vct pin to gnd, and gnd pin to the negative power supply. for single power supply, connect gnd pin to gnd. v cc /2, generated from the internal circuit, is output to vct pin. connect a by-pass capacitor between this pin and gnd. the operating voltage range is 7.0 to 16v, which satisfies the signal handling of 12db specified by the dolby laboratories. 2) operation mode control the CXA2502M has built-in electronic switches. the operations are controlled by the dc voltages of nrsw and mode control pins. table 1 shows the switching truth tables. for single power supply, vh, vm and vl correspond to v cc , v cc /2 and gnd, respectivery. for dual power supply, vh, vm and vl correspond to v cc , gnd and v ee , respectively. refer to "threshold" on the characteristics graph for the thresholds of the control voltages. nrsw and mode control pins are connected to vct via a 50k ? resistor, so when the pin is open, vm condition results. table 1 3) reference level the CXA2502M dolby level is 6dbm (388mvrms). the reference level of the playback input pin (pb in) is defined as the levels which provide the line output level to the line output pin (line out) in nr off mode. nrsw c type b type nr off vh vm vl mode tape aux
8 CXA2502M example of representative characteristics quiescent current consumption vs. supply voltage v cc supply voltage [v] 46810121416 i cc quiescent current consumption [ma] 9 10 11 12 13 14 15 decode mode nr off b type c type quiescent current consumption vs. input level input level [db] 12 0 4 8 12 i cc quiescent current consumption [ma] 9 10 11 12 13 14 15 decode mode v cc = 9v 0db = 6dbm 8 4 nr off b f = 10khz c f = 10khz b f = 1khz c f = 1khz signal handling v cc supply voltage [v] 46810121416 signal handling [db] 0 10 20 decode mode f = 1khz thd = 1% 0db = 6dbm nr off c type load characteristics frequency [hz] 100 300 1k 0 6 10 decode mode v cc = 9v thd = 1% f = 1khz nr off maximum output level [dbm] 2 8 12 4 3k 10k 12 10 8 6 4 2 0 b type decode characteristics 500 200 100 1k 2k 5k 10k 20k frequency [hz] decode boost [db] v cc = 9v 0db = lineout level 0db 40db 30db 20db 10db 2 24 20 16 12 8 4 0 c type decode characteristics 500 200 100 1k 2k 5k 10k 20k frequency [hz] decode boost [db] v cc = 9v 0db = lineout level 50db 60db 40db 30db 20db 10db 0db 4
9 CXA2502M nr off total harmonic distortion-1 output level [db] 4 0 4 8 12 16 20 distortion [%] 0.001 0.01 0.1 decode mode v cc = 9v 0db = 6dbm f = 10khz f = 100hz f = 1khz b type total harmonic distortion-1 output level [db] 4 0 4 8 12 16 20 distortion [%] 0.001 0.01 0.1 decode mode v cc = 9v 0db = 6dbm f = 10khz f = 100hz f = 1khz c type total harmonic distortion-1 output level [db] 4 0 4 8 12 16 20 distortion [%] 0.01 0.1 1.0 decode mode v cc = 9v 0db = 6dbm f = 10khz f = 100hz f = 1khz nr off total harmonic distortion-2 output level [db] 4 0 4 8 12 16 20 distortion [%] 0.001 0.01 0.1 decode mode f = 1khz 0db = 6dbm v cc = 7v v cc = 16v b type total harmonic distortion-2 output level [db] 4 0 4 8 12 16 20 distortion [%] 0.001 0.01 0.1 decode mode f = 1khz 0db = 6dbm v cc = 7v v cc = 16v c type total harmonic distortion-2 output level [db] 4 0 4 8 12 16 20 distortion [%] 0.01 0.1 1.0 decode mode f = 1khz 0db = 6dbm v cc = 7v v cc = 16v
10 CXA2502M cross talk frequency [hz] 100 300 1k v cc = 9v input = +10db refer to dolby level nr off cross talk [db] 30 3k 10k 40 50 60 70 80 90 ch to ch aux to pb, pb to aux mode control threshold v cc power supply [v] 46810121416 v cm mode control voltage [v] 2 4 6 8 10 12 14 pb aux 0 nr control threshold v cc supply voltage [v] 46810121416 v cn nr control voltage [v] 2 4 6 8 10 12 14 c type nr off 0 b type v cc vct
11 CXA2502M package outline unit: mm package structure package material lead treatment lead material package mass sony code eiaj code jedec code sop-16p-l01 sop016-p-0300 copper alloy solder plating epoxy resin 16pin sop (plastic) 9.9 0.1 + 0.4 16 9 18 1.27 0.45 0.1 5.3 0.1 + 0.3 7.9 0.4 6.9 1.85 0.15 + 0.4 0.5 0.2 0.2 0.05 + 0.1 0.1 0.05 + 0.2 0.2g 0.15 m 0.24 lead plating specifications item lead material copper alloy solder composition sn-bi bi:1-4wt% plating thickness 5-18 m spec. sony corporation

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