Sony CXA1846AM Electronic volume control Datasheet

CXA1846AM/AN
Electronic volume control
For the availability of this product, please contact the sales office.
Description
The CXA1846AM/AN is an electrical volume
control IC for use in car radios/stereos and radiocassette 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
CXA1846AM
20 pin SOP (Plastic)
CXA1846AN
20 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage
VCC
13
V
• Operating temperature Topr
–40 to +85
°C
• Storage temperature
Tstg –65 to +150 °C
• Allowable power dissipation
350 (75°C) mW
PD SOP
SSOP 220 (75°C) mW
Structure
Bipolar silicon monolithic IC
Recommended Supply Voltage Range
Supply voltage
VCC
6 to 12
V
INP1
INN1
VCT1
INAO1
VRIN1
OUT1
NC
GND
VCT
VCC
Block Diagram and Pin Configuration
20
19
18
17
16
15
14
13
12
11
LATCH
LATCH CONTROL
100k
VCTBUFF
VCTBUFF
50K
VOLUME
1dB STEP
VCTBUFF
100k
VOLUME
8dB STEP
ZCDET
SHIFT REGISTER
INN2
VCT2
INAO2
VRIN2
6
7
8
9
10
INIT
5
CLK
4
DATA
3
VOLUME
1dB STEP
CE
2
VOLUME
8dB STEP
OUT2
1
INP2
50K
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—
E97102B8Y
CXA1846AM/AN
Pin Description
Pin No.
Symbol
I/O resistance
voltage
Equivalent circuit
Description
VCC
1
20
INP2
INP1
50kΩ
VCT
129
Input operational amplifier positive
phase input
1
20
GND
VCC
2
19
INN2
INN1
—
VCT
129
Input operational amplifier
reversed phase input
2
19
GND
VCC
3
18
VCT2
VCT1
—
VCT
VCT buffer output
3
18
GND
VCC
4
17
INAO2
INAO1
—
VCT
4
Input operational amplifier
17
GND
VCC
5
16
VRIN2
VRIN1
8.2kΩ
VCT
Volume input
5
16
GND
—2—
CXA1846AM/AN
Pin No.
Symbol
I/O resistance
voltage
Equivalent circuit
Description
VCC
6
15
OUT2
OUT1
—
VCT
Volume output
6
GND
VCC
7
CE
≅∞
—
129
Latch enable
7
GND
VCC
8
DATA
≅∞
—
129
Serial data input
8
GND
VCC
9
CLK
≅∞
—
129
Serial clock
9
GND
VCC
10
INIT
—
—
129
10
System reset
GND
11
VCC
—
12
VCT
—
VCT
13
GND
—
—
+ power supply
Mid-point potential
GND
—3—
CXA1846AM/AN
Electrical Characteristics
Item
Circuit current
Total harmonic distortion
Output noise voltage
Maximum output voltage
Separation
Maximum attenuation
High
Input voltage
Low
Input voltage range
Maximum output current
(Unless otherwise specified VCC = 8V, Ta = 25°C)
Symbol
ICC
THD
Vn
Vom
CS
ATTm
Vsh
Vsl
Vin
Imax
Measurement Condition
No signal
1kHz, 5dBm
Input shorted
1kHz
1kHz
Data, INIT
CLK, CE
Input buffer amplifier output current
Min.
5
—
—
8
85
85
3
0
1
—
Typ. Max. Unit
8
12
mA
0.003 0.01
%
5
7
µVrms
—
—
dBm
90
—
dB
90
—
dB
—
6
V
—
1.5
V
— VCC – 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
VRC1
VRF1
VRC2
VRF2
Setting
–∞
–7dB
–∞
–7dB
—4—
CXA1846AM/AN
Data Allocation
Fast bit
D1
NOP
D2
D3
D4
D5
VRC1
D6
D7
D8
VRF1
D9
NOP
D10
D11
D12
D13
VRC2
D14
D15
D16
VRF2
MSB
LSB
VRC1/VRC2
Setting
0
–8
–16
–24
–32
–40
–48
–56
–64
–72
–80
–∞
–∞
D2/D10
1
1
1
1
1
1
1
1
0
0
0
0
0
D3/D11
1
1
1
1
0
0
0
0
1
1
1
1
0
D4/D12
1
1
0
0
1
1
0
0
1
1
0
0
0
D6/D14
1
1
1
1
0
0
0
0
D7/D15
1
1
0
0
1
1
0
0
D8/D16
1
0
1
0
1
0
1
0
VRF1/VRF2
Setting
0
–1
–2
–3
–4
–5
–6
–7
—5—
D5/D13
1
0
1
0
1
0
1
0
1
0
1
0
0
CXA1846AM/AN
Data Timing
CE
DATA
D1
D2
D3
D15
D16
CLK
Min. 0.5µs
Min. 0.5µs
Max. 1MHz
CE
Min. 4µs
—6—
CXA1846AM/AN
Test Circuit
TP1
TP2
TP3
V4
50mV
R3
R6
C6
V6
AC
–60dBm
GND
GND
B
S1
S4
1k
V2 10µ
C9
10k 1µ
10µ
A
1k
C2
C4
S3
R4
100p
10k
R8
10µ
VCC
S2
AC
C7
20
19
18
17
16
15
14
13
12
11
INP1
INN1
VCT1
INAO1
VRIN1
OUT1
NC
GND
VCT
VCC
GND
V7
8V
VRIN2
OUT2
CE
DATA
CLK
INIT
3
4
5
6
7
8
9
10
1k
1k
1k
S8
S7
C3
100p
R1
GND
–60dBm
10µ
R5
1k R2
10k
C1
C5
1k
GND
V5
10k 1µ AC
R7
50mV
V3
TP4
5V
0V
CLK
B
V1 10µ
A
S6
1n
INAO2
2
C10
VCT2
1
S5
AC
INN2
GND
INP2
GND
TP5
—7—
C8
DATA
CE
5V
0V
5V
0V
CXA1846AM/AN
Application Circuit
VCC
OUT1 C7
GND
10µ
10k
IN1
C2
R4
C5
C8
10µ
10k
10µ
10µ
47µ
C10
R4
IN2
19
17
VRIN1
OUT1
GND
VCT
VRIN2
OUT2
CE
DATA
CLK
INIT
1
2
3
4
5
6
7
8
9
10
10µ
10k
C1
R1
VCC
INAO1
INAO2
11
VCT1
12
VCT2
13
INN1
14
INN2
15
INP1
16
INP2
18
NC
GND
20
10µ
C11
0.01µ
R4
10k
R3
10µ
GND
OUT2 C6
SERIAL CTL
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.
—8—
CXA1846AM/AN
Total harmonic distortion
1.0
Total harmonic distortion [%]
RL = 10kΩ
VCC = 8V
Volumue = 0dB
0.1
20kHz
100Hz
0.01 1kHz
0.001
–30
–20
–10
Output level [dBm]
—9—
0 2 4 6 8 10
CXA1846AM/AN
Package Outline Unit : mm
CXA1846AM
20PIN SOP (PLASTIC)
+ 0.4
12.45 – 0.1
+ 0.4
1.85 – 0.15
20
11
6.9
10
+ 0.1
0.2 – 0.05
1.27
0.24
0.5 ± 0.2
1
0.45 ± 0.1
+ 0.2
0.1 – 0.05
7.9 ± 0.4
+ 0.3
5.3 – 0.1
0.15
M
PACKAGE STRUCTURE
SONY CODE
SOP-20P-L01
EIAJ CODE
SOP020-P-0300
JEDEC CODE
CXA1846AN
PACKAGE MATERIAL
EPOXY RESIN
LEAD TREATMENT
SOLDER PLATING
LEAD MATERIAL
COPPER ALLOY
PACKAGE MASS
0.3g
20PIN SSOP (PLASTIC)
+ 0.2
1.25 – 0.1
∗6.5 ± 0.1
0.1
11
20
1
6.4 ± 0.2
∗4.4 ± 0.1
A
10
0.65
b
(0.15)
(0.22)
0.5 ± 0.2
0.1 ± 0.1
DETAIL B : SOLDER
b=0.22 ± 0.03
+ 0.03
0.15 – 0.01
+ 0.1
b=0.22 – 0.05
+ 0.05
0.15 – 0.02
0.13 M
DETAIL B : PALLADIUM
NOTE: Dimension “∗” does not include mold protrusion.
0° to 10°
PACKAGE STRUCTURE
DETAIL A
PACKAGE MATERIAL
EPOXY RESIN
SONY CODE
SSOP-20P-L01
LEAD TREATMENT
SOLDER / PALLADIUM
PLATING
EIAJ CODE
SSOP020-P-0044
LEAD MATERIAL
42/COPPER ALLOY
PACKAGE MASS
0.1g
JEDEC CODE
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
—10—
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