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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 = 25C) 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
17 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 100 8
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 8 VEE VC
96.3k 23.8k 8 VEE VC 8 300
VCC
VCC 200
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 400 VEE VCC VEE
25p
15
FE
O
147 15 10p 400 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 200
7.3k
VEE
Equalizing pin is used of RF amplifier. Frequency response can be adjusted by connecting CR to this pin.
VC
VCC 50 147
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 1 S1 3 A LC/PD 18 S9 VCC PD LD ON 19 E2 VEE VCC 33
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 33 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
100/6.3V
LD 1 1k VCC 56k 2 10k 100 55k 10k 56k 10k VREF 1.25V VEE VEE 19 LDON MICRO COMPUTER
10H
PD
1/6.3V
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 147. Connect this circuit to GND when used at dual power supply.
VCC
VCC
30k
VC BUFFER 12 147 VC
33/6.3V
VC 33/6.3V
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
33/6.3V
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
100/6.3V
I-V I-V I-V I-V
I-V
150k
10H
1/6.3V
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
100/6.3V
I-V I-V I-V I-V
33/6.3V
150k
I-V
150k
500 100
22
10H
1/6.3V
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
33/6.3V
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 150k 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

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