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CXA2549M RF Amplifier for CD Players Description The CXA2549M is an IC developed for compact disc players. This IC incorporates an RF amplifier, focus error amplifier, APC circuit and RF level control circuit. (The voltage-converted optical pickup output is supported.) Features * Low power consumption (45 mW at 2.5 V) * High-band RF amplifier * APC circuit * RF level control circuit * Both single power supply and dual power supply operations possible. * Compatible with pickup for LC and PD Applications Compact disc players Structure Bipolar silicon monolithic IC Block Diagram and Pin Configuration (50%/30%/OFF) 24 pin SOP (Plastic) Absolute Maximum Ratings (Ta=25 C) * Supply voltage VCC 12 V * Operating temperature Topr -20 to +75 C * Storage temperature Tstg -65 to +150 C * Allowable power dissipation PD 650 mW Operating Conditions Supply voltage VCC--VEE 4.5 to 5.5 V AGCCONT AGCVTH LC/PD LD ON RFTC RF_I RFO VCC RFE FE_BIAS FE TE 24 23 22 21 20 19 18 17 16 15 14 13 VCC RF_EQ_AMP 5.7K APC LD AMP 56k 25p VCC FPCUS ERROR AMP 25.4K VC 50A 174k 15K 17.4K 670mV 56k 10k 10k 1k VC 5K 164k 87k 13.4k RF SUMMING AMP VCC 10k 14K 25p VC 55k VC VREF 1.25V VC 23.8k 23.8k 158.45k w w w .d sh ta a ee VEE EO LD C A E 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. PD --1-- VC EI D B F u. t4 1 260k 12p VEE VC BUFFER 23.3K 23.3K 23.3K 23.3K 24K 24K 24K 24K 260k VEE VC R34 147 om c VEE 12p VC 26k 13k 820k 820k VCC 10k 30k 30k VC 11 12 2 3 4 5 6 7 8 9 10 E97428-TE www..com 158.45k TRACKING ERROR AMP VC 42.6K R26 VC 15k VEE VC CXA2549M Pin Description Pin No. Symbol IO Equivalent circuit Description VCC VCC 10k 1k 55.7k 1 LD O 1 Output pin of APC amplifier. VEE VCC 17 2 PD I 2 55k 147 10k Input pin of APC amplifier. VEE VEE VEE VEE VCC 24k 23.2k VCC VCC VCC A3 25p 3 4 5 6 14 A B C D FE BIAS I I I I I B4 24k 23.2k 14k 174k 4.2k C5 24k 23.2k 100 8 87k 25p Input pin of RF and FE amplifiers for Pins 3, 4, 5 and 6; focus bias adjustment for Pin 14. D6 24k 23.2k VEE VC VEE 164K VC 14 FE BIAS 7 VEE -- VEE. --2-- CXA2549M Pin No. Symbol IO VCC Equivalent circuit 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 23 is a bias for LC when connected to VCC and for PD IC when left open. VCC VCC 12p 12p 147 11 8 9 10 11 23 F E EI EO LC/PD I I -- -- I 147 260k 8 820k 23 820k 147 96.3k 8 VEE VC 96.3k 23.8k 8 VEE VC 9 260k 10 8 300 VCC VCC 200 120 12 VC O 147 12 120 15k 16k DC voltage output pin of (VCC+VEE)/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. VEE VCC 13 TE O 147 13 158.45k Output pin of tracking error amplifier. The F-E signal is output. 10p 400 VEE VCC VEE 25p 15 FE O 147 15 174k Output pin of focus error amplifier. 10p 400 VEE VEE --3-- CXA2549M Pin No. Symbol IO Equivalent circuit Description 25.4k 5.7k 25 16 REF -- 16 5k Equalizing pin of RF amplifier. Frequency response can be adjusted by connecting CR to this pin. VCC 147 25.4k 17 RFO O 17 60k 800 Output pin of RF amplifier. 147 18 18 RF_I I 15k Input pin of RF amplifier output RFO with capacitance coupled. 20 19 RFTC -- 147 19 50 50 External time-constant pin for RF level control. 10 50 147 20 AGCVTH -- 20 13.4k 10 Variable pin of reference level for RF level control. The reference level can be varied by the external resistor. --4-- CXA2549M Pin No. Symbol IO Equivalent circuit Description 15 15 21 AGCCONT I 147 21 50k 7 RF level control ON (limit level of 50 % / 30 %)/ OFF switching pin. 50 % for VCC, 30 % for open or VC and OFF for VEE. VCC 50 147 22 LD ON I 22 VREF ON/OFF selection pin of APC amplifier. ON for VCC and OFF for VEE. 30k VEE VEE VEE VEE 24 VCC -- VCC --5-- Electrical Characteristics Bias conditions and measurement method Input GND Input GND Input GND Input 1 kHz 100 mVp-p. Output AC measurement Output DC measurement Output DC measurement Input GND Output DC measurement -- -30.0 20.3 20.3 -3.0 Output DC measurement Output DC measurement input GND Output DC measurement 1.9 -25 21.9 21.9 -3.0 Output DC measurement Output DC measurement Output DC measurement Output DC measurement Output DC measurement 1 1 1 0 A 1 LD OFF I1=0.8mA Output DC measurement Output DC measurement Level control : 50 % (E4 : 3.8 V) O 50 mV 2.0 V 3.8 V/1.3 V 700 A -Level control OFF (E4 :1.3 V) Level control : 30 % (E4 : 3.3 V) O 50 mV 2.0 V 3.3 V/1.3 V 700 A 1 -Level control OFF (E4 :1.3 V) Level control : -50 % (E4 : 3.8 V) O 800 mV 2.0 V 3.8 V/1.3 V 170 A 1 -Level control OFF (E4 : 1.3 V) Level control : -30 % (E4 :1.8 V) O 800 mV 2.0 V 1.8 V/1.3 V 170 A 1 12 -Level control OFF (E4 : 1.3 V) Output DC measurement 1.9 -- -- -1.5 0.6 2.1 -- 2.2 19.9 -- -- 0 23.3 23.3 0 -- -- 10 24.9 24.9 0 -- -- -1.7 0 2.0 2.3 -- 45 27.9 27.9 3.0 -- -1.9 -0.3 1.1 -- -- 0 -2950 -2350 -1150 Output DC measurement -35 --10 22.9 -11.61 -8.6 5.59 8.6 11.61 -5.59 15 25.9 -- -2 30.0 26.3 26.3 3.0 -1.9 mA mA mV dB V V mV dB dB dB V V mV dB dB dB V V V V V V V mV Min. Typ. Max. Unit Description of I/O waveform 2.5 V power supply (VCC=2.5 V, VEE=-2.5 V, VC=GND) SW conditions Measurement item 6 E1 24 7 17 17 O 280 mV -280 mV 15 15 15 15 O 310 mV 310 mV 13 13 O 13 O 270 mV 270 mV 2.0 V 2.0 V 2.0 V 0.5 V O 2.0 V 1.3 V 1.3 V 0 A 1.3 V 590 A 1.3 V 410 A 1 1.3 V 230 A 1 13 OO 13 13 V13-4=V13-2-V13-3 15 O 15 V15-4=V15-2-V15-3 Input 1 kHz 100 mVp-p. Output AC measurement Input 1 kHz 100 mVp-p. Output AC measurement 17 O 17 E2 E3 E4 I1 7 8 9 10 Symbol Measurement No. 1 2 Current consumption ICC IEE 3 Offset voltage 1 V17-1 4 Voltage gain V17-2 OOOO RF amplifier 5 Maximum output amplitude H V17-3 OOOO 6 Maximum output amplitude L V17-4 OOOO 7 Offset voltage V15-1 8 Voltage gain 1 V15-2 O O 9 Voltage gain 2 V15-3 O O FE amplifier 10 Voltage gain difference V15-4 11 Maximum output amplitude L V15-5 O O 12 Maximum output amplitude H V15-6 O O 13 Offset voltage 1 V13-1 Measurement pin 1 2 3 4 5 14 Voltage gain 1 V13-2 O Input 1 kHz 140 mVp-p. Output AC measurement Input 1 kHz 140 mVp-p. Output AC measurement 15 Voltage gain 2 V13-3 TE amplifier 22 APC RF level control --6-- 16 Voltage gain difference V13-4 17 Maximum output amplitude H V13-5 O 18 Maximum output amplitude L V13-6 19 Output voltage 1 V1-1 20 Output voltage 2 V1-2 21 Output voltage 3 V1-3 Output voltage 4 V1-4 23 Maximum output amplitude V1-5 24 50 % limit V1-6 OOOO 25 30 % limit V1-7 OOOO -1620 -1120 -120 mV 26 -50 % limit V1-8 1550 2350 2800 mV 27 -30 % limit V1-9 598 -100 1098 -- 1598 100 mV mV 28 Center output voltage V12-1 O in the SW conditions represents the ON state. CXA2549M Electrical Characteristics Measurement Circuit GND GND VEE VEE GND GND GND GND GNDGND GND VEE VCC R1 1M C3 0.1 C1 33 A R3 R5 R8 R9 10k 10k S10 E3 22 21 20 19 18 17 16 15 14 E4 E2 S9 24 23 10k 13 VCC RF_I LC/PD LD ON RFTC RFO RFE FE AGCCONT AGCVTH LD A C VEE E EO FE_BIAS PD B D F 1 150k C4 33 R2 2 3 4 5 6 7 8 R4 9 150k 10 EI 11 12 S8 R7 S1 S3 S2 S4 A R1 R6 26k 0.8mA 300 S5 S6 13k GND VCC VCC VEE GND VEE GND AC E1 S7 I2 I1 GND GND CXA2549M VC TE 10k --7-- CXA2549M 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 17. When the RF signal is equalized, an equalizing circuit is added to Pin 16. A I-V A B I-V B C I-V C D I-V D 3 24k RF SUMMING AMP 5.7k RF EQAMP 5k 25.4k 17 RFO RFOUT 16 REF 4 24k 14k 5 24k 4.2k 4.3k 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 I-V B C I-V C D I-V D 3 23.3k 4 23.3k 25p 174k 23.3k 87k 25p 164k FOCUS ERROR AMP 15 FE FEOUT VCC 5 6 23.3k VC 14 FE BIAS FOCUS 47k BIAS GND GND --8-- CXA2549M 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 23 can be used as a bias for LC when connected to VCC and as a bias for PD IC when left open. 260k VC F I-V 150k E I-V 150k EI 26k VC 13k 23.8k 158.45k 23 LC/PD 8 820k 820k 12p 23.8k 13 TRACKING ERROR AMP 158.45k VC VC TE TEOUT 9 TRK E GAIN EO 22k 22k 10 260k 12p 11 GND --9-- CXA2549M APC & Laser Power Control VCC R1 22 C2 100 LD 1 R6 1k VCC L1 10H 130mV PD C1 1 R3 100 R2 500 LD PD VEE R4 10k VEE R5 55k R8 10k R10 56k LD ON 22 MICRO COMPUTER 2 R11 10k VL R12 56k VREF VEE GND R14 12.5k RF_I C3 0.01 RFO 17 R9 17.4k RF VC VC 19 20 670mV R15 13.4k 18 1.1Vp-p 15k R7 1.9V 42.6k 50 AGCCONT 21 MICRO COMPUTER R13 1M C4 1 VEE VEE * APC When the laser diode is driven by a constant current, the optical power output has extremely large negative temperature characteristics. The APC circuit is used to maintain the optical power output at a constant level. The laser diode current is controlled according to the monitor photo diode output. APC is set to ON by connecting the LD ON pin to VCC ; OFF by connecting it to VEE. * Laser Power Control (LPC) The RF level is stabilized by attaching an offset to the APC VL and controlling the laser power in sync with the RF level fluctuations. The RFO and RF_I levels are compared and the larger of the two is smoothed by the RFTC's external CR. This signal is then compared with the reference level. The laser power is controlled by attaching an offset to VL according to the results of comparison with the reference level. Set the reference level to 670 mV. (center voltage reference) When the reference level is changed, connect the external resistor to the AGCVTH pin (Pin 20). The reference level can be lowered by connecting the resistor between Pin 20 and the center output voltage or between Pin 20 and VCC. The AGCCONT pin (Pin 21) is used to switch the level of the laser power control circuit ; OFF, ON (laser power limit of 30 %) and ON (laser power limit of 50 %) For the laser power limit, 50 % is recommended for PD IC ; 30 % for LC. AGCCONT L (VEE) M (VC or OPEN) H (VCC) LPC OFF ON ON LPC limit -- 30 % 50 % VL variable range Approximately 1.27 V Approximately 1.27 V350 mV Approximately 1.27 V570 mV --10-- AGCVTH RFTC CXA2549M 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. VCC VCC 30k VC BUFFER VC 12 147 30k 15k VEE VEE 33/6.3V VC 33/6.3V Notes on Operation 1. Power supply The CXA2549M 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 +power supply Power supply VEE -power supply GND VC GND OPEN Dual power supply Single power supply 2. Laser Power Control The RF level is stabilized by attaching an offset to the APC VL and controlling the laser power in sync with the RF level fluctuations. Therefore, use this circuit in the state where the focus servo is applied. The laser life is shortened by increasing the laser power when the less light is reflected from the disc. It is recommended that the typical laser power value is set lower to maintain the laser life. Take care of the laser maximum ratings when using the laser power control circuit. --11-- CXA2549M Application Circuit * For single power supply +5 V MICRO COMPUTER GND +5V MICRO COMPUTER FOCUS BIAS SSP SSP 1M VC 1 33/6.3V VCC 47k 0.01 24 23 22 21 20 19 18 17 16 15 14 13 GND VEE VCC AGCCONT LC/PD RFTC RFO FE VCC 100/6.3V AGCVTH VEE FE_BIAS LD ON RF_I RFE VCC LD 22 C 33/6.3V 1 2 A 3 4 5 6 7 8 150k E 9 150k 10 11 EO PD B D F EI 12 10H I-V I-V I-V I-V 22k 500 100 I-V I-V GND VC VC TRK E GAIN 1/6.3V C A B D F E LD PD GND GND Connect Pin 23 to VCC when LC is used. * For dual power supply +2.5 V +2.5V MICRO COMPUTER MICRO COMPUTER VEE FOCUS BIAS 22k VC VCC SSP SSP 1M GND 1 33/6.3V VCC 47k 0.01 24 23 22 21 20 19 18 17 16 15 14 13 AGCCONT LC/PD RFTC RFO FE VCC 100/6.3V AGCVTH VEE FE_BIAS LD ON RF_I RFE VCC LD 22 C 33/6.3V 1 2 A 3 4 5 6 7 8 150k E 9 150k 10 11 EO PD B D F EI 12 10H 22k I-V I-V I-V 500 100 I-V I-V VEE GND I-V GND TRK E GAIN 1/6.3V C A B D F E GND LD PD VEE GND Connect Pin 23 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 patent and other right due to same. --12-- 22k GND VC TE SSP VC TE SSP CXA2549M Package Outline Unit : mm 24PIN SOP (PLASTIC) + 0.4 15.0 - 0.1 24 13 + 0.4 1.85 - 0.15 0.15 + 0.3 5.3 - 0.1 7.9 0.4 + 0.2 0.1 - 0.05 0.45 0.1 1.27 + 0.1 0.2 - 0.05 0.12 M PACKAGE STRUCTURE MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SOP-24P-L01 SOP024-P-0300-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY/PHENOL RESIN SOLDER PLATING COPPER ALLOY / 42ALLOY 0.3g --13-- 0.5 0.2 1 12 6.9 |
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