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 3-
spot 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
Absolute Maximum Ratings (Ta = 25C)
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
1
E94932-TE
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.
CXA1821M
20 pin SOP (Plastic)
LD
PD
A
B
C
D
V
EE
F
E
EI
V
CC
V
CC
LD ON
LC/PD
RFE
RFO
FE
FE BIAS
TE
VC
EO
1k
56k
10k
55k
56k
10k
V
EE
10k
V
EE
VREF
1.25V
APC LD AMP
24k
30k
24k
30k
24k
24k
30k
30k
28k
5.6k
10k
RF EQ AMP
22k
V
C
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
VC
VC
30k
TRACKING
ERROR AMP
V
CC
820k
VC
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
5
CXA1821M
Electrical Characteristics
Power supply
2.5V (V
CC
= 2.5V, V
EE
= 2.5V, VC = GND)
O in the SW conditions represents the ON state.
SW conditions
Bias conditions
Description of I/O waveform
Measurement item
Symbol
and
Min.
Typ.
Max.
Unit
1
2
3
4
5
6
7
8
9
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
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
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
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