CXA1821M RF Amplifier for CD Players 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 3spot optical pickup output. (The voltage-converted optical pickup output is supported.) 20 pin SOP (Plastic) Features • Low power consumption (40mW at ±2.5V) • APC circuit • Both single power supply (+5V) and dual power supply (±2.5V) operations possible. • Compatible with pickup for LC and PD • Supports the RF amplifier at double speed. Absolute Maximum Ratings (Ta = 25°C) 12 • Supply voltage VCC • Operating temperature Topr –20 to +75 • Storage temperature Tstg –65 to +150 • Allowable power dissipation PD 600 Applications Compact disc players Operating Conditions • Supply voltage VCC – VEE Structure Bipolar silicon monolithic IC V °C °C mW 2.8 to 11.0 V EO 11 VC 15k 147 VEE VCC VC VC BUFFER TRACKING ERROR AMP VC 8 9 10 F E EI 260k VC 12p 820k 820k 12p VC 7 VEE 30k 6 D 30k 24k 24k 5 C 30k 4 B 24k 30k 3 A 24k PD 23.8k 123k VC 23.8k VC 26k 260k VEE 10k VEE 2 12 13 TE FE BIAS FOCUS ERROR AMP VC RF SUMMING AMP VEE 28k 1.25V VREF 174k V C 25p RF EQ AMP 5.6k 10k APC LD AMP 56k 10k VCC 55k 13k 10k 25p 56k 87k 1k 14 FE RFE 17 15 LC/PD 18 RFO LD ON 19 16 VCC VCC 22k 1 30k 164k LD 30k 123k 20 Block Diagram and Pin Configuration Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. –1– E94932-TE CXA1821M Pin Description Pin No. Symbol I/O Equivalent circuit Description VCC VCC 10k 55.7k 1k 1 LD Output pin of APC amplifier. 1 O VEE VCC 17µ 55k 2 PD Input pin of APC amplifier. 147 I 2 10k VEE VEE VCC A VEE VEE VCC VCC VCC 24k 3 30k 3 4 5 6 14 A B C D FE BIAS I I I I I B 24k 25p 28k 174k 4 30k 4.9k C 24k 5 87k 25p 100µ 8µ 30k 24k D VEE 6 VC VEE Input pin of RF and FE amplifier for Pins 3, 4, 5 and 6; focus bias adjustment for Pin 14. VC 164k 30k 14 FE BIAS 7 VEE — VEE. –2– CXA1821M Pin No. Symbol I/O Equivalent circuit VCC VCC VCC Description VCC VCC VCC 12p 12p 8 9 10 11 18 F E EI EO LC/PD I I — — I 147 11 260k 147 8 820k 96.3k 96.3k 23.8k 8µ 18 VEE 8µ VEE VC VC 820k 147 8µ 9 260k 10 VCC VCC DC voltage output pin of (VCC + VEE)/2. 200µ 120 12 VC 15k 147 O 12 120 300µ 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 VCC and for PD IC when left open. 16k VEE Connect to GND when dual power supply (±2.5V) is used; connect a smoothing capacitor when single power supply (+5V) is used. VCC 123k 147 13 TE O 13 Output pin of tracking error amplifier. The F-E signal is output. 10p 400µ VEE VEE VCC 25p 15 FE O 147 174k 15 10p 400µ VEE –3– VEE Output pin of focus error amplifier. CXA1821M Pin No. Symbol I/O Equivalent circuit Description VCC 22k 147 16 RFO Output pin of RF amplifier. 16 O VEE 22k 5.6k 17 17 RFE — 7.3k 10k 200µ VEE Equalizing pin is used of RF amplifier. Frequency response can be adjusted by connecting CR to this pin. VC VCC 50µ 147 19 LD ON I 19 30k VREF VEE 20 VCC — ON/OFF selection pin of APC amplifier. ON for VCC and OFF for VEE VEE VEE VEE VCC. –4– 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 3 2 1 Measurement item V16-3 V16-4 V15-1 V15-2 V15-3 V15-4 V15-5 V15-6 V13-1 V13-2 V13-3 V13-4 V13-5 V13-6 V1-1 V1-2 V1-3 V1-4 V1-5 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 V12-1 V16-2 Output voltage 1 V16-1 Voltage gain IEE ICC Symbol Offset voltage 1 Current consumption RF amplifier FE amplifier TE amplifier APC –5– Center amplifier Measurement No. Electrical Characteristics O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O 1 2 3 4 5 6 7 8 9 SW conditions 270mV 270mV 310mV 310mV –280mV 280mV E1 2.0V 0.5V 2.0V 2.0V 2.0V E2 Bias conditions +0mV +0mV +177mV +123mV +69mV E3 Measurement pin — –30.0 18.3 18.3 Output DC measurement Output DC measurement 15 Input 1kHz 260 mVp-p Output AC measurement 15 Input 1kHz 260 mVp-p Output AC measurement Output DC measurement Output DC measurement 12 1 1 1 1 1 13 13 I1 = 0.8mA LD OFF Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement –100 — 2.1 0.6 –1.5 — — 1.9 –3.0 19.8 19.8 –30 1.9 — — 2.3 2.0 0.0 –1.7 — — 0 22.7 22.7 0 — — 0 21.2 21.2 0 — — 22.1 — –7.23 7.23 Typ. +100 0.0 — — 1.1 –0.3 –1.9 — 3.0 25.8 25.8 30 –1.9 3.0 24.3 24.3 30.0 –0.3 — 25.2 25.0 — 11.0 Max. mV V dB mV V dB mV V dB mV mA Unit ∗ O in the SW conditions represents the ON state. 13 V13-4 = V13-2 – V13-3 13 Input 1kHz 140 mVp-p Output AC measurement 13 Input 1kHz 140 mVp-p Output AC measurement 13 Input GND 15 15 15 V15-4 = V15-2 – V15-3 15 Input GND 16 Output DC measurement 1.3 Output DC measurement 16 –3.0 19.2 16 Input GND –25.0 –11.0 Output DC measurement Input GND — Min. 16 Input 1kHz 100 mVp-p Output AC measurement 7 20 Input GND measurement method and Description of I/O waveform Power supply ±2.5V (VCC = 2.5V, VEE = –2.5V, VC = GND) CXA1821M –6– GND GND VEE GND GND VEE VCC DC + E1 AC S7 1µ C1 E3 0.8mA I1 150k S6 R2 150k 33µ S5 R1 C2 S4 S3 S2 S1 S8 A 10 9 8 7 6 5 4 3 2 1 EI E F VEE D C B A PD LD EO VC TE FE BIAS FE RFO RFE LC/PD LD ON VCC 11 12 13 14 15 16 17 18 19 20 13k R7 10k R6 10k R5 10k R4 10k R3 S9 E2 A 33µ C3 26k R8 GND GND GND GND GND GND VCC VEE VCC GND CXA1821M Electrical Characteristics Measurement Circuit CXA1821M 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. A I-V 3 RFE 24k A I-V 17 5.6k RF SUMMING AMP B 4 B RF EQAMP 28k 24k 22k RFO 16 10k C I-V 5 24k C D I-V RFOUT 4.9k 7.3k 6 24k D VC VC GND 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. A I-V 3 30k A I-V B 4 30k B I-V C 174k 5 15 30k C I-V D 25p D 25p 87k 164k FOCUS ERROR AMP FE VCC FE BIAS 6 14 30k VC FEOUT 47k GND GND –7– FOCUS BIAS CXA1821M 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 VCC and as a bias for PD IC when left open. 18 LC/PD VC 260k VC F 123k 26k 13k 23.8k TE 8 I-V 150k 820k 23.8k 12p 820k E 9 I-V TRACKING ERROR AMP 150k TEOUT 13 123k VC TRK E GAIN VC EI 11 10 GND EO 22k 22k 12p 260k 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 VCC, APC is ON; connected to VEE, it is OFF. 100µ/6.3V VCC 22 10µH LD 1 1k VCC 56k PD 2 19 10k 1µ/6.3V 100 56k 55k 10k 10k VREF 1.25V 500 VEE PD LD VEE GND –8– LDON MICRO COMPUTER CXA1821M Center Voltage Generation Circuit This circuit provides the center potential when this IC is used at single power supply. The maximum current is approximately ±3mA. The output impedance is approximately 147Ω. Connect this circuit to GND when used at dual power supply. VCC VCC 30k 33µ/6.3V VC BUFFER 12 VC VC 147 30k 33µ/6.3V 15k VEE VEE 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. VCC VEE Dual power supply +power supply –power supply Single power supply Power supply GND –9– VC GND OPEN CXA1821M VC 12 11 VC EO EI 10 150k I-V I-V E F D GND C B A PD LD 22k GND 500 1µ/6.3V GND 22 VCC E F 8 150k 100 100µ/6.3V 10µH 9 TE 13 14 7 D 6 I-V VEE FE FE BIAS 15 16 RFO C 5 I-V 17 RFE B 4 I-V 18 LC/PD A 3 19 LD ON PD 2 I-V 20 VCC LD 1 22k VC GND 47k TRK E GAIN 33µ/6.3V SSP CXA1372 FOCUS BIAS VCC SSP CXA1372 SSP CXA1372 VCC GND +5V MICRO COMPUTER Application Circuit • For single power supply +5V ∗ Connect Pin 18 to VCC when LC is used. GND SSP CXA1372 11 EO 10 EI 12 VC I-V GND F E 150k 150k 9 E TE F 8 22k VEE PD GND LD I-V 33µ/6.3V VEE D C B 1µ/6.3V GND VCC 500 100 10µH A 100µ/6.3V 22 13 14 FE BIAS VEE 7 D FE 6 I-V 15 16 RFO C 5 I-V 17 RFE B 4 I-V 18 LC/PD A 3 LD ON PD 2 I-V VCC LD 1 19 20 22k GND 47k TRK E GAIN 33µ/6.3V VEE FOCUS BIAS VCC SSP CXA1372 SSP CXA1372 VCC GND +2.5V MICRO COMPUTER • For dual power supply ±2.5V ∗ Connect Pin 18 to VCC when LC is used. Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party and other right due to same. – 10 – CXA1821M Example of Representative Characteristics Current consumption characteristics 10 Current consumption (mA) 9 8 7 6 5 4 2 3 4 5 6 7 8 9 Single power supply voltage (V) 10 11 RF amplifier frequency characteristics RF amplifier gain (dB) 30 Supply voltage ±2.5V RF Amp 100 mV input A + B + C + D input ∗ Short between VC and GND 26 22 18 14 10 100 1k 10k 100k 1M 10M Frequency (Hz) FE amplifier frequency characteristics (Frequency response comparison for A+C input and B+D input) FE amplifier frequency errer characteristics AA AAAAAAA AAAAAA AAAAA AA Supply voltage ±2.5V FE Amp 260mVp-p input A + C input B + D input ∗ Short between VC and GND 20 10 0 100 1k 10k 100k –30 Supply voltage ±2.5V FE amplifier gain (dB) FE amplifier gain (dB) 30 FE Amp 260mVp-p input A + C + B + D input ∗ Short between VC and GND –40 –50 –60 100 Frequency (Hz) 1k 10k Frequency (Hz) – 11 – 100k CXA1821M TE amplifier frequency characteristics (Frequency response comparison for F input and E input) FE adjustment range characteristics 3 30 TE amplifier gain (dB) 2 1 0 –1 –2 20 10 Supply voltage ±2.5V 150k TE Amp 140mVp-p input 150k F input E input ∗ Short between VC and GND 8 F 9 E EI 10 EO 11 13k 26k –2 –1 0 1 2 0 100 3 1k 10k Frequency (Hz) Input DC voltage (V) TE amplifier frequency error characteristics 0 TE amplifier gain (dB) –3 –3 Supply voltage ±2.5V TE Amp 140mVp-p input F + E input ∗ Short between VC and GND –10 –20 –30 –40 100 1k 10k 100k Frequency (Hz) AAAAAAAAAA APC I/O voltage characteristics 2 1 Output DC voltage (V) Output DC voltage (V) AAAAAAA AAAA AAA AAAAA AA A AA Supply voltage ±2.5V ∗ Short between VC and GND 0 –1 AA Supply voltage ±2.5V APC ON APC OFF ∗ Short between VC and GND –2 0 100 200 Input DC voltage (mV) – 12 – 300 100k CXA1821M Unit: mm 20PIN SOP (PLASTIC) + 0.4 12.45 – 0.1 20 + 0.4 1.85 – 0.15 11 0.15 6.9 10 + 0.1 0.2 – 0.05 1.27 0.24 0.5 ± 0.2 1 0.45 ± 0.1 + 0.2 0.1 – 0.05 7.9 ± 0.4 + 0.3 5.3 – 0.1 Package Outline M PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SOP-20P-L01 LEAD TREATMENT SOLDER PLATING EIAJ CODE SOP020-P-0300 LEAD MATERIAL COPPER ALLOY PACKAGE MASS 0.3g JEDEC CODE – 13 –