CXA1821M

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.) 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. Applications Compact disc players Structure Bipolar silicon monolithic IC Block Diagram and Pin Configuration FE BIAS LD ON LC/PD RFO RFE VCC EO VC FE TE 20 pin SOP (Plastic) 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 Operating Conditions • Supply voltage VCC – VEE V °C °C mW 2.8 to 11.0 V 19 13 20 18 17 16 15 14 TRACKING ERROR AMP VC 12 FOCUS ERROR AMP APC LD AMP RF EQ AMP 5.6k 10k VC VC BUFFER 123k 147 VC EI 10 260k 12p VEE 15k V C 25p 56k 174k VC 23.8k 23.8k VC RF SUMMING AMP VCC 56k 10k 10k 1k VREF 1.25V VEE 28k 26k 820k VEE 260k 24k 30k 24k 30k 24k 30k 24k 1 2 30k VC 7 8 3 4 5 6 F 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– VEE LD PD A B C D E 9 820k 55k 12p 13k VC 11 30k 30k 123k VEE 164k 25p 87k 22k 10k VCC VCC E94932-TE CXA1821M Pin Description Pin No. Symbol I/O Equivalent circuit Description VCC VCC 10k 1k 55.7k 1 LD O 1 Output pin of APC amplifier. VEE VCC 17µ 55k 2 PD I 147 2 10k Input pin of APC amplifier. VEE VEE VEE VEE VCC 24k 3 30k 24k 4 30k VCC VCC VCC A 25p 28k 174k 3 4 5 6 14 A B C D FE BIAS I I I I I B 4.9k C 24k 5 30k 24k D 6 30k VEE VEE 164k 100µ 8µ 87k 25p Input pin of RF and FE amplifier for Pins 3, 4, 5 and 6; focus bias adjustment for Pin 14. VC VC 14 FE BIAS 7 VEE — VEE. –2– CXA1821M Pin No. Symbol I/O Equivalent circuit VCC VCC VCC VCC Description 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. DC voltage output pin of (VCC + VEE)/2. Connect to GND when dual power supply (±2.5V) is used; connect a smoothing capacitor when single power supply (+5V) is used. VCC VCC 12p 12p 147 11 8 9 10 11 18 F E EI EO LC/PD I I — — I 147 8 820k 18 820k 147 9 260k 10 260k 96.3k 8µ VEE VC 96.3k 23.8k 8µ VEE VC 8µ 300µ VCC VCC 200µ 120 12 VC O 147 12 120 15k 16k VEE VCC 147 123k 13 TE O 13 Output pin of tracking error amplifier. The F-E signal is output. 10p 400µ VEE VCC VEE 25p 15 FE O 147 15 10p 400µ VEE VEE 174k Output pin of focus error amplifier. –3– CXA1821M Pin No. Symbol I/O Equivalent circuit VCC Description 147 22k 16 RFO O 16 Output pin of RF amplifier. VEE 22k 5.6k 17 17 RFE — 10k 200µ 7.3k 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 VREF ON/OFF selection pin of APC amplifier. ON for VCC and OFF for VEE 30k VEE VEE VEE VEE 20 VCC — VCC. –4– Electrical Characteristics SW conditions and measurement method — –11.0 Output DC measurement Power supply ±2.5V (VCC = 2.5V, VEE = –2.5V, VC = GND) Bias conditions Min. Typ. Max. Description of I/O waveform Unit Measurement item 123456789 20 Input GND 7 16 Input GND OOOO OOOO OOOO 15 Input GND O O 15 V15-4 = V15-2 – V15-3 O 310mV 310mV 15 13 Input GND O O O O O O O 15 Output DC measurement Output DC measurement Output DC measurement Symbol E1 7.23 –7.23 — 22.1 1.3 — –30.0 18.3 18.3 –3.0 — — 0 21.2 21.2 0 — 1.9 –30 19.8 19.8 13 V13-4 = V13-2 – V13-3 O 270mV 270mV 2.0V 2.0V 2.0V 0.5V O 2.0V +69mV +123mV +177mV +0mV +0mV OO O 13 13 1 1 1 1 1 LD OFF I1 = 0.8mA Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement Measurement No. 1 Input GND –25.0 19.2 ICC Measurement pin E2 E3 11.0 mA — 25.0 25.2 — V –0.3 30.0 24.3 24.3 3.0 –1.9 V — 0 30 mV dB mV mV dB Current consumption 2 IEE 3 16 Input 1kHz 100 mVp-p Output AC measurement O O –280mV 16 280mV 16 Output DC measurement Output DC measurement Output DC measurement Offset voltage 1 V16-1 5 Voltage gain V16-2 RF amplifier 6 Maximum output amplitude H V16-3 7 Maximum output amplitude L V16-4 8 O O Offset voltage V15-1 9 Voltage gain 1 V15-2 15 Input 1kHz 260 mVp-p Output AC measurement 15 Input 1kHz 260 mVp-p Output AC measurement 10 Voltage gain 2 V15-3 FE amplifier 11 Voltage gain difference V15-4 12 Maximum output amplitude L V15-5 TE amplifier APC Center amplifier –5– 12 13 Maximum output amplitude H V15-6 14 Offset voltage V13-1 15 Voltage gain 1 V13-2 13 Input 1kHz 140 mVp-p Output AC measurement 13 Input 1kHz 140 mVp-p Output AC measurement 22.7 22.7 –3.0 1.9 — — –1.5 0.6 2.1 — 0 — — –1.7 0.0 2.0 2.3 — 25.8 25.8 3.0 — –1.9 –0.3 1.1 — — 0.0 V dB 16 Voltage gain 2 V13-3 17 Voltage gain difference V13-4 18 Maximum output amplitude H V13-5 19 Maximum output amplitude L V13-6 20 Output voltage 1 V1-1 21 Output voltage 2 V1-2 22 Output voltage 3 V1-3 23 Output voltage 4 V1-4 24 Maximum output amplitude V1-5 25 Output voltage 1 V12-1 Output DC measurement –100 — +100 mV CXA1821M ∗ O in the SW conditions represents the ON state. C3 GND I1 S8 1 20 0.8mA E3 VEE 2 C1 GND 1µ S1 3 A LC/PD 18 S9 VCC PD LD ON 19 E2 VEE VCC 33µ GND 4 RFE B 17 S2 Electrical Characteristics Measurement Circuit S3 5 C RFO 16 A VCC LD VCC R3 GND 10k R4 A –6– S4 6 D VEE 7 VEE C2 GND 33µ S5 R1 8 150k AC S7 S6 R2 150k 9 GND DC 10 EI + E1 E F FE 15 10k R5 FE BIAS 14 10k R6 TE 13 10k GND GND GND VC 12 GND R7 EO 11 13k R8 GND 26k CXA1821M 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. I-V A A 3 24k RF SUMMING AMP 4 24k 28k 10k 5.6k RF EQAMP 22k RFO 16 RFOUT RFE 17 I-V B B I-V C C 5 24k 4.9k 7.3k I-V D D 6 24k 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 A B 3 30k I-V B 4 30k 25p 174k 5 30k 87k 6 30k VC 25p 164k FOCUS ERROR AMP 14 15 FE VCC I-V C C FEOUT I-V D D FE BIAS 47k GND FOCUS BIAS GND –7– 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 VC F I-V 150k E I-V 150k EI GND 10 260k 12p 11 9 8 820k 820k VC VC EO 12p 23.8k 123k TRK E GAIN 22k 22k 260k 26k 13k 23.8k 123k TE TRACKING ERROR AMP 13 TEOUT 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. VCC 22 100µ/6.3V LD 1 1k VCC 56k 2 10k 100 55k 10k 56k 10k VREF 1.25V VEE VEE 19 LDON MICRO COMPUTER 10µH PD 1µ/6.3V 500 GND PD LD –8– 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 VC BUFFER 12 147 VC 33µ/6.3V VC 33µ/6.3V 30k 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 VC GND OPEN –9– CXA1821M Application Circuit • For single power supply +5V MICRO COMPUTER SSP CXA1372 SSP CXA1372 SSP CXA1372 FOCUS BIAS +5V VCC GND VCC GND 33µ/6.3V TRK E GAIN 47k VC 22k 14 20 19 18 17 16 12 15 13 11 22k FE BIAS VC TE RFE LD ON LC/PD RFO VCC VEE PD LD 150k 100µ/6.3V I-V I-V I-V I-V I-V 150k 10µH 1µ/6.3V 100 GND B C D A E F GND VCC 500 I-V 10 2 7 8 1 3 4 5 6 9 EI C D A B E F EO FE PD LD ∗ Connect Pin 18 to VCC when LC is used. • For dual power supply ±2.5V MICRO COMPUTER SSP CXA1372 SSP CXA1372 SSP CXA1372 VCC FOCUS BIAS +2.5V VEE GND GND GND 22k 20 18 14 17 16 12 19 15 13 11 22k FE BIAS TE VC LD ON LC/PD RFO RFE VCC VEE PD LD 100µ/6.3V I-V I-V I-V I-V 33µ/6.3V 150k I-V 150k 500 100 22 10µH 1µ/6.3V A B D VEE C F GND VCC PD LD VEE ∗ 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 – GND GND E I-V 10 7 8 2 3 1 4 5 6 9 EI C D A B E F EO FE GND 33µ/6.3V 47k TRK E GAIN VCC VC 22 CXA1821M Example of Representative Characteristics Current consumption characteristics 10 9 Current consumption (mA) 8 7 6 5 4 2 3 4 5 6 7 8 9 Single power supply voltage (V) 10 11 RF amplifier frequency characteristics 30 Supply voltage ±2.5V RF Amp 100 mV input A + B + C + D input ∗ Short between VC and GND RF amplifier gain (dB) 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) 30 Supply voltage ±2.5V FE Amp 260mVp-p input A + C input B + D input ∗ Short between VC and GND 20 –30 FE amplifier frequency errer characteristics Supply voltage ±2.5V FE Amp 260mVp-p input A + C + B + D input ∗ Short between VC and GND –40 FE amplifier gain (dB) FE amplifier gain (dB) 100k 10 –50 0 100 1k Frequency (Hz) 10k –60 100 1k Frequency (Hz) 10k 100k – 11 – CXA1821M FE adjustment range characteristics 3 Supply voltage ±2.5V ∗ Short between VC and GND 30 TE amplifier frequency characteristics (Frequency response comparison for F input and E input) 2 Output DC voltage (V) 1 TE amplifier gain (dB) 20 0 –1 10 –2 Supply voltage ±2.5V 1 50k TE Amp 140mVp-p input 150k F input E input ∗ Short between VC and GND 8F 9 E EI 10 EO 11 13k 26k –3 –3 –2 –1 0 1 2 3 0 100 1k Frequency (Hz) 10k 100k Input DC voltage (V) TE amplifier frequency error characteristics 0 Supply voltage ±2.5V TE Amp 140mVp-p input F + E input ∗ Short between VC and GND TE amplifier gain (dB) –10 –20 –30 –40 100 1k Frequency (Hz) 10k 100k APC I/O voltage characteristics 2 1 Output DC voltage (V) 0 –1 Supply voltage ±2.5V APC ON APC OFF ∗ Short between VC and GND 0 100 200 Input DC voltage (mV) 300 –2 – 12 – CXA1821M Package Outline Unit: mm 20PIN SOP (PLASTIC) + 0.4 12.45 – 0.1 20 11 + 0.4 1.85 – 0.15 0.15 + 0.3 5.3 – 0.1 7.9 ± 0.4 + 0.2 0.1 – 0.05 1.27 0.24 M PACKAGE STRUCTURE PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SOP-20P-L01 SOP020-P-0300 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER PLATING COPPER ALLOY 0.3g – 13 – 0.5 ± 0.2 1 0.45 ± 0.1 10 6.9 + 0.1 0.2 – 0.05