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E97102B8Y
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.
Absolute Maximum Ratings (Ta=25 C)
Supply voltage
V
CC
13
V
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
65 to +150
C
Allowable power dissipation
P
D
SOP
350 (75C) mW
SSOP
220 (75C) mW
Recommended Supply Voltage Range
Supply voltage
V
CC
6 to 12
V
Description
The CXA1846AM/AN is an electrical volume
control IC for use in car radios/stereos and radio-
cassette recorders featuring serial data control. It
has improved over the CXA1846M/N by reducing
the `pop' noise during volume level-switchings.
Features
Volume adjustment (0dB to 87dB,
dB)
Balance
Serial data control (DATA, CLK, CE)
Single 8V power supply
Zero-cross detection circuit
Structure
Bipolar silicon monolithic IC
Electronic volume control
CXA1846AM/AN
Block Diagram and Pin Configuration
VOLUME
8dB STEP
VOLUME
1dB STEP
100k
100k
VCTBUFF
LATCH
SHIFT REGISTER
ZCDET
LATCH CONTROL
VOLUME
8dB STEP
VOLUME
1dB STEP
VCTBUFF
VCTBUFF
50K
50K
INP1
INN1
VCT1
INAO1
VRIN1
OUT1
NC
GND
VCT
V
CC
INP2
INN2
VCT2
INAO2
VRIN2
OUT2
CE
DATA
CLK
INIT
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CXA1846AM
CXA1846AN
20 pin SOP (Plastic)
20 pin SSOP (Plastic)
For the availability of this product, please contact the sales office.
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CXA1846AM/AN
Pin Description
1
20
2
19
3
18
4
17
5
16
INP2
INP1
INN2
INN1
VCT2
VCT1
INAO2
INAO1
VRIN2
VRIN1
50k
VCT
--
VCT
--
VCT
--
VCT
8.2k
VCT
129
V
CC
GND
20
1
129
V
CC
GND
2
19
V
CC
GND
18
3
V
CC
GND
4
17
V
CC
GND
16
5
Input operational amplifier positive
phase input
Input operational amplifier
reversed phase input
VCT buffer output
Input operational amplifier
Volume input
Pin No.
Symbol
I/O resistance
voltage
Equivalent circuit
Description
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CXA1846AM/AN
Electrical Characteristics
(Unless otherwise specified V
CC
= 8V, Ta = 25C)
Item
Symbol
Measurement Condition
Min.
Typ.
Max.
Unit
Circuit current
Total harmonic distortion
Output noise voltage
Maximum output voltage
Separation
Maximum attenuation
Input voltage
High
Low
Input voltage range
Maximum output current
I
CC
THD
Vn
Vom
CS
ATTm
Vsh
Vsl
Vin
Imax
No signal
1kHz, 5dBm
Input shorted
1kHz
1kHz
Data, INIT
CLK, CE
Input buffer amplifier output current
5
8
12
mA
--
0.003
0.01
%
--
5
7
Vrms
8
--
--
dBm
85
90
--
dB
85
90
--
dB
3
--
6
V
0
--
1.5
V
1
--
V
CC
1
V
--
--
1
mA
RESET
The IC is reset by reducing the voltage at the INIT pin to 1V or less when CLK is high. Reset can not be
performed when CLK is low. The table below shows the status when the IC has been reset.
MODE
Setting
VRC1
VRF1
7dB
VRC2
VRF2
7dB
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