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?1 e94932a1y-te rf amplifier for cd players CXA1821M 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. absolute maximum ratings (ta=25 c) supply voltage v cc 12 v operating temperature topr 20 to +75 c storage temperature tstg 65 to +150 c allowable power dissipation p d 600 mw operating conditions supply voltage v cc v ee 2.8 to 11.0 v description the CXA1821M is an ic developed for compact disc players. this ic incorporates an apc circuit and rf, focus error, and tracking error amplifiers for 3- spot optical pickup output. (the voltage-converted optical pickup output is supported.) features low power consumption (40 mw at 2.5 v ) apc circuit both single power supply (+5 v) and dual power supply (2.5 v) operations possible. compatible with pickup for lc and pd supports the rf amplifier at double speed. applications compact disc players structure bipolar silicon monolithic ic block diagram and pin configuration 20 pin sop (plastic) ld pd a b c d v ee f e ei v cc 4 17 v cc ld on lc/pd rfe rfo fe fe bias te vc eo 1 2 20 1k 56k 10k 55k 56k 10k v ee 10k v ee vref 1.25v apc ld amp 19 24k 30k 24k 30k 24k 24k 30k 30k 28k 5.6k 10k rf eq amp 22k vc vc rf summing amp 174k 25p 164k focus error amp 87k 25p v ee 26k 13k 12p 23.8k 23.8k 123k 820k 12p v cc 30k v ee 147 vc vc vc 260k 123k 260k vc buffer 15k 3 18 5 6 15 16 7 8 13 14 12 9 10 11 vc vc 30k tracking error amp v cc 820k vc
CXA1821M 2 1 2 3 4 5 6 14 7 ld pd a b c d fe bias v ee o i i i i i i 1k 10k 55.7k v cc v cc v ee 1 2 55k v ee 147 17 v ee 10k v ee v ee v cc 4.9k 28k v ee 24k 30k 24k 30k 24k 30k 24k 30k 100 87k 174k v ee 8 25p 14 25p fe bias 164k 4 5 6 3 a b c d v cc v cc v cc v cc vc vc output pin of apc amplifier. input pin of apc amplifier. input pin of rf and fe amplifier for pins 3, 4, 5 and 6; focus bias adjustment for pin 14. v ee . pin no. symbol i/o equivalent circuit description pin description
CXA1821M 3 8 9 10 11 18 12 13 f e ei eo lc/pd vc te i i i o o 96.3k v ee 147 260k vc v cc 8 12p 8 18 820k 820k 260k 11 147 23.8k 96.3k v ee vc 8 12p v cc v cc v cc v cc 8 300 v cc 147 9 10 120 v ee v cc 147 200 120 16k 12 15k v cc 10p v ee 147 400 123k 13 v ee v cc input pin of tracking error amplifier for pins 8 and 9. an external resistor for v-i conversion should be connected because these pins are for current input. gain adjustment of input signal from pin 9 for pins 10 and 11. pin 18 is a bias for lc when connected to v cc and for pd ic when left open. dc voltage output pin of (v cc +v ee )/2. connect to gnd when dual power supply (2.5 v) is used; connect a smoothing capacitor when single power supply (+5 v) is used. output pin of tracking error amplifier. the f-e signal is output. pin no. symbol i/o equivalent circuit description
CXA1821M 4 15 16 17 19 20 fe rfo rfe ld on v cc o o i 147 22k v cc v ee 16 7.3k 5.6k v ee 200 17 10k 22k vc 30k v ee v cc 147 50 v ee 19 v ee v ee vref output pin of focus error amplifier. output pin of rf amplifier. equalizing pin is used of rf amplifier. frequency response can be adjusted by connecting cr to this pin. on/off selection pin of apc amplifier. on for v cc and off for v ee v cc . pin no. symbol i/o equivalent circuit description v cc 10p v ee 147 400 174k v ee 25p 15
CXA1821M 5 electrical characteristics power supply 2.5 v (v cc =2.5 v, v ee = 2.5 v, vc=gnd) sw conditions bias conditions description of i/o waveform measurement item symbol and min. typ. max. unit 123456789 e1 e2 e3 measurement method 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 20 7 16 16 16 16 15 15 15 15 15 15 13 13 13 13 13 13 1 1 1 1 1 12 input gnd input gnd input gnd input 1khz 100 mvp-p input gnd input 1khz 260 mvp-p input 1khz 260 mvp-p v 15-4 =v 15-2 v 15-3 input gnd input 1khz 140 mvp-p input 1khz 140 mvp-p v 13-4 =v 13-2 v 13-3 ld off i 1 =0.8ma output dc measurement output ac measurement output dc measurement output dc measurement output dc measurement output ac measurement output ac measurement output dc measurement output dc measurement output dc measurement output ac measurement output ac measurement output dc measurement output dc measurement output dc measurement output dc measurement output dc measurement output dc measurement output dc measurement output dc measurement 7.23 11.0 ma 11.0 7.23 25.0 25.0 mv 19.2 22.1 25.2 db 1.3 v 0.3 30.0 0 30.0 mv 18.3 21.2 24.3 18.3 21.2 24.3 db 3.0 0 3.0 1.9 v 1.9 30 0 30 mv 19.8 22.7 25.8 19.8 22.7 25.8 db 3.0 0 3.0 1.9 1.9 1.7 0.3 1.5 0.0 1.1 v 0.6 2.0 2.1 2.3 0.0 100 +100 mv current consumption offset voltage 1 voltage gain maximum output amplitude h maximum output amplitude l offset voltage voltage gain 1 voltage gain 2 voltage gain difference maximum output amplitude l maximum output amplitude h offset voltage voltage gain 1 voltage gain 2 voltage gain difference maximum output amplitude h maximum output amplitude l output voltage 1 output voltage 2 output voltage 3 output voltage 4 maximum output amplitude output voltage 1 i cc i ee v 16-1 v 16-2 v 16-3 v 16-4 v 15-1 v 15-2 v 15-3 v 15-4 v 15-5 v 15-6 v 13-1 v 13-2 v 13-3 v 13-4 v 13-5 v 13-6 v 1-1 v 1-2 v 1-3 v 1-4 v 1-5 v 12-1 280mv 280mv 310mv 310mv 270mv 270mv 2.0v +69mv 2.0v +123mv 2.0v +177mv 0.5v +0mv 2.0v +0mv measurement no. rf amplifier fe amplifier te amplifier apc center amplifier measurement pin * in the sw conditions represents the on state.
CXA1821M 6 electrical characteristics measurement circuit ld pd a b c d v ee f e ei 17 v cc ld on lc/pd rfe rfo fe fe bias te vc eo i1 r2 150k v cc 0.8ma s8 1 e3 v ee c1 1 gnd 2 s1 s2 gnd s3 33 v ee c2 gnd a gnd e1 dc ac s4 s6 r1 150k s5 v ee c3 a gnd 33 v cc e2 v cc s9 gnd r3 10k gnd r4 10k gnd r5 10k gnd r6 10k gnd gnd r8 26k r7 13k 11 12 13 14 15 16 18 19 20 3 4 5 6 7 8 9 10 + s7
CXA1821M 7 description of functions rf amplifier each signal current from the photodiodes a, b, c and d is i-v converted, and input to pins 3, 4, 5 and 6. these signals are added by the rf summing amplifier and equalized by the rf equalizing amplifier and then output to pin 16. when the rf signal is equalized, an equalizing circuit is added to pin 17. focus error amplifier the operation of (b+d) (a+c) is performed and the signal is output to pin 15. pin 14 is used for bias adjustment of the focus error signal. d 5 i-v gnd d c i-v c 24k 24k b i-v b 24k a i-v a 24k 28k rf summing amp 4.9k 10k 22k 7.3k vc 5.6k rf eqamp rfe rfo 17 16 3 4 6 rfout vc v cc d 5 i-v gnd d c i-v c 30k 30k b i-v b 30k a i-v a 30k focus error amp 174k vc 47k focus bias 4 6 87k 25p 164k 25p gnd feout fe bias fe 14 15 3
CXA1821M 8 tracking error amplifier each signal current from the photodiodes e and f is i-v converted and input to pins 8 and 9 via an input resistor which determines the gain. the signal is amplified by the gain amplifier, operated by the tracking error amplifier and then the (f-e) signal is output to pin 13. the e input gain can be adjusted by pin 11. pin 18 can be used as a bias for lc when connected to v cc and as a bias for pd ic when left open. apc circuit when the laser diode is driven with constant current, the optical output possesses large negative temperature characteristics. therefore, the current must be controlled with the monitor photodiode to ensure the output remains constant. this constitutes the apc circuit. when ld on pin is connected to v cc , apc is on; connected to v ee , it is off. 12p gnd i-v 260k 150k i-v 150k tracking error amp 260k trk e gain 13k 123k teout eo f e 820k 820k 26k 23.8k 23.8k 123k 22k 22k te lc/pd ei 8 9 10 12p 11 13 18 vc vc vc vc gnd vref 1.25v v ee micro computer ld pd 100 500 56k 1k ldon 22 1 /6.3v 10 h 10k 10k v ee 56k v cc 100 /6.3v 10k v cc 55k 19 1 2 ld pd
CXA1821M 9 center voltage generation circuit this circuit provides the center potential when this ic is used at single power supply. the maximum current is approximately 3 ma. the output impedance is approximately 147 ? . connect this circuit to gnd when used at dual power supply. notes on operation power supply the CXA1821M can be used either at dual power supply or single power supply. the table below shows the connection of power supply for each case. v ee vc buffer 30k 147 vc 33 /6.3v 15k v cc 30k v ee v cc 12 33 /6.3v vc dual power supply single power supply v cc +power supply power supply v ee power supply gnd vc gnd open
CXA1821M 10 application circuit for single power supply +5 v * connect pin 18 to v cc when lc is used. for dual power supply 2.5 v * connect pin 18 to v cc when lc is used. ld pd a b c d v ee f e ei v cc ld on lc/pd rfe rfo fe fe bias te vc eo v cc gnd 500 d i-v c i-v b i-v a 100 /6.3v 10 h 1 /6.3v 100 22 gnd i-v gnd f i-v e i-v 150k 150k v cc gnd 33 /6.3v micro computer ssp cxa1372 +5v ssp cxa1372 v cc gnd focus bias ssp cxa1372 vc 47k 22k 22k vc trk e gain 1 2 3 4 5 6 7 8 9 10 17 11 12 13 14 15 16 18 19 20 ld pd ld pd a b c d v ee f e ei v cc ld on lc/pd rfe rfo fe fe bias te vc eo v c c gnd 500 d i-v c i-v b i-v a 100 /6.3v 10 h 1 /6.3v 100 22 gnd i-v gnd e i-v f i-v 150k 150k v cc gnd 33 /6.3v micro computer ssp cxa1372 +2.5v ssp cxa1372 v cc focus bias ssp cxa1372 47k 22k 22k trk e gain 1 2 3 4 5 6 7 8 9 10 17 11 12 13 14 15 16 18 19 20 ld pd v ee v ee 33 /6.3v gnd gnd v ee 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 and other right due to same.
CXA1821M 11 2 34 56 7 891011 4 5 6 7 8 9 10 100 1k 10k 100k 1m 10m 10 14 18 22 26 30 current consumption characteristics single power supply voltage (v) current consumption (ma) rf amplifier frequency characteristics frequency (hz) rf amplifier gain (db) supply voltage 2.5v rf amp 100 mv input a+b+c+d input short between vc and gnd 100 1k 10k 100k 0 10 20 30 fe amplifier frequency characteristics (frequency response comparison for a+c input and b+d input) frequency (hz) fe amplifier gain (db) supply voltage 2.5v fe amp 260mvp-p input a+c input b+d input short between vc and gnd 100 1k 10k 100k 50 40 30 fe amplifier frequency errer characteristics frequency (hz) fe amplifier gain (db) supply voltage 2.5v fe amp 260mvp-p input a+c+b+d input short between vc and gnd 60 example of representative characteristics
CXA1821M 12 fe adjustment range characteristics 3 2 10123 2 1 0 1 2 3 input dc voltage (v) output dc voltage (v) 3 supply voltage 2.5v short between vc and gnd 100 1k 10k 100k 0 10 20 30 te amplifier frequency characteristics (frequency response comparison for f input and e input) frequency (hz) te amplifier gain (db) supply voltage 2.5v te amp 140mvp-p input f input e input short between vc and gnd 150k 150k f ei eo 8 10 11 100 1k 10k 100k 40 30 20 10 te amplifier frequency error characteristics frequency (hz) te amplifier gain (db) supply voltage 2.5v te amp 140mvp-p input f+e input short between vc and gnd 0 0 100 200 300 2 1 0 1 apc i/o voltage characteristics input dc voltage (mv) output dc voltage (v) supply voltage 2.5v apc on apc off short between vc and gnd 2 9 e 13k 26k
CXA1821M 13 package outline unit: mm sony code eiaj code jedec code sop-20p-l01 *sop020-p-0300-a package structure package material lead treatment lead material package weight copper alloy solder plating epoxy resin 0.3g 20pin sop (plastic) 300mil 12.45 -0.1 +0.4 20 11 0.45 0.1 1.27 10 1 5.3 -0.1 +0.3 7.9 0.4 6.9 0.2 -0.05 +0.1 0.5 0.2 0.1 -0.05 +0.2 1.85 -0.15 +0.4 0.15 0.12 m
CXA1821M 14 sony corporation sony code eiaj code jedec code sop-20p-l01 *sop020-p-0300-a package structure package material lead treatment lead material package weight copper alloy solder plating epoxy resin 0.3g 20pin sop (plastic) 300mil 12.45 -0.1 +0.4 20 11 0.45 0.1 1.27 10 1 5.3 -0.1 +0.3 7.9 0.4 6.9 0.2 -0.05 +0.1 0.5 0.2 0.1 -0.05 +0.2 1.85 -0.15 +0.4 0.15 0.12 m 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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