Sony CXA2546Q Datasheet
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E97602C91-TE
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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 VCC 13 V
• Operating temperature Topr –40 to +85 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 350 mW
(Ta=85 °C)
Recommended Operating Conditions
Supply voltage VCC 7 to 12 V
Description
The CXA2546Q is a 2-channel electronic volume
IC. A 34-bit serial data input controls the level and
characteristics of the output signal. It may be used
in car stereos and general audio systems.
Features
• Loudness
• Volume control
(from 0 dB to –80 dB, –∞ dB : Fine (1 dB-step)
Coarse (2 dB-step)
• Balance
• Tone control
(3-band, 2 dB-step from –15 dB to +15 dB)
• Fader
2 dB-step to –20 dB, –25 dB, –30 dB, –45 dB, –60
dB, –∞ dB)
• Input and gain selector (4 channels)
• Serial data control (DATA, CLK, CE)
• Single 8 V power supply
• Zero-cross detection circuit
(L/R independent operation for the volume block)
• Timer
• Power-off mute
• Countermeasure to the noise of the portable
telephone
Structure
Bipolar silicon monolithic IC
3-band Electronic Volume
48 pin QFP (Plastic)
CXA2546Q
For the availability of this product, please contact the sales office.
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CXA2546Q
Block Diagram and Pin Configuration
LOUD
FNTO1
REO1
CE
CLK
DGND
GND
V
CC
VCT
DATA
TIMER
REO2
FNTO2
GAIN12
GAIN11
IN14
IN13
IN12
IN11
IN21
IN22
IN23
IN24
GAIN21
GAIN22
GAIN134
LDLC1
LDHC1
INAO1
VRIN1
TCHC1
TCMC11
TCMC12
TCLC11
TCLC12
TCO1
FDIN1
GAIN234
LDLC2
LDHC2
INAO2
VRIN2
TCHC2
TCMC21
TCMC22
TCLC21
TCLC22
TCO2
FDIN2
INPUT SWITCH
INPUT SWITCH
VOLUME
2dB STEP
LOUD
VOLUME
1dB STEP
TONE FADER
48
45
44
43
42
41
40
39
38
37
47
46
VOLUME
2dB STEP
VOLUME
1dB STEP
TONE FADER
LOUD
36 35 34 33 32 31 30 29 28 27 26 25
VCTBUFF
VCTBUFF
VCTBUFF
LATCH
LATCH
CONTROL
SHIFT REGISTER
VCTBUFF
VCTBUFF
VCTBUFF
ZCDET
VOL
ZCDET
VOL
ZCDET
1 2 3 4 5 6 7 8 9 10 11 12
22
21
20
19
18
17
16
15
14
23
13
24
—3—
CXA2546Q
Pin Description
Pin
Symbol
I/O resistance
Equivalent circuit Description
No. Pin voltage
2
35
3
34
4
33
5
32
6
31
LDLC2
LDLC1
LDHC2
LDHC1
INAO2
INAO1
VRIN2
VRIN1
TCHC2
TCHC1
1.08 k
VCT
24.05 k
VCT
—
VCT
10 k
VCT
5 k
VCT
2
35
VCC
GND
VCC
GND
3
34
VCC
GND
4
33
VCC
GND
5
32
VCC
GND
6
31
Sets loudness low cut-off
frequency.
Set loudness high cut-off
frequency
Input selector output
Volume input
Set tone Treble frequency
—4—
CXA2546Q
Pin
Symbol
I/O resistance
Equivalent circuit Description
No. Pin voltage
7
30
8
29
9
28
10
27
11
26
TCMC21
TCMC11
TCMC22
TCMC12
TCLC21
TCLC11
TCLC22
TCLC12
TCO2
TCO1
4 k
VCT
4 k
VCT
8 k
VCT
8 k
VCT
—
VCT
VCC
GND
7
30
VCC
GND
8
29
VCC
GND
9
28
VCC
GND
10
27
VCC
GND
11
26
Sets tone Mid frequency
Sets tone Mid frequency
Sets tone Bass frequency
Sets tone Bass frequency
Tone control output
—5—
CXA2546Q
Pin
Symbol
I/O resistance
Equivalent circuit Description
No. Pin voltage
12
25
13
24
14
23
15
16
FDIN2
FDIN1
REO2
REO1
FNT02
FNT01
TIMER
DATA
24 k
VCT
—
VCT
—
VCT
~
∞
—
~
∞
—
VCC
GND
12
25
VCC
GND
13
24
VCC
GND
14
23
VCC
GND
15
VCC
GND
16
124 4k
Fader input
Rear output
Front output
Sets timer constant
Serial data input
—6—
CXA2546Q
Pin
Symbol
I/O resistance
Equivalent circuit Description
No. Pin voltage
17
18
19
20
21
22
1
36
37
38
47
48
39
40
41
42
43
44
45
46
VCT
VCC
GND
DGND
CLK
CE
GAIN234
GAIN134
GAIN12
GAIN11
GAIN21
GAIN22
IN14
IN13
IN12
IN11
IN21
IN22
IN23
IN24
—
VCT
—
VCC
—
Gnd
—
—
~
∞
—
~
20k
—
~
∞
VCT
50 k
VCT
VCC
GND
21
124 4k
VCC
GND
22
124
4k
20k
VCC
GND
47
38
37
36
1
48
VCC
GND
44
42
46
4039
41
43
45
1/2 VCC
Power supply input
Ground
Digital ground
Serial clock input
Latch enable input
Take care to set the level as
the input impedance is low.
External gain setting for input
amplifier
Signal input
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