Sony CXA2546Q Datasheet

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E97602C91-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.
Absolute Maximum Ratings (Ta=25 °C)
Supply voltage VCC 13 V
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
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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
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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
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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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