Page 1
—1—
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
• 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.
Page 2
—2—
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
Page 3
—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
Page 4
—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
Page 5
—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
Page 6
—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
Page 7
—7—
CXA2546Q
Data Format
First Bit
Last Bit
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
D32
D33
D34
D35
D36
NOP
NOP
ISW
LOUD
VRC1
VRF1
VRC2
VRF2
TONE BASS
TONE MID
TONE TREBLE
FADER
FADER SELECT
Page 8
—8—
CXA2546Q
ISW
LOUD
VRC1/VRC2
Mode
IN14/IN24, GAIN134/GAIN234
IN13/IN23, GAIN134/GAIN234
IN12/IN22, GAIN12/GAIN22
IN11/IN21, GAIN11/GAIN21
D3
1
1
0
0
D4
1
0
1
0
Mode
ON
OFF
D5
1
0
Output (dB)
0
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
–22
–24
–26
–28
–30
–32
–34
–36
–38
–40
–42
–44
–46
–48
–50
–52
–54
–56
–58
–60
–62
–64
–66
–68
–70
–72
–74
–76
–78
–80
– ∞
D6/D13
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
D7/D14
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
D8/D15
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
0
D9/D16
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
—
—
D10/D17
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
—
—
D11/D18
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
—
—
—
—
—
—
—
—
—
—
Page 9
—9—
CXA2546Q
VRF1/VRF2
BASS/MID/TREBLE
BOOST/CUT
FADER
Output (dB)
0
–1
D12/D19
1
0
Mode
BOOST
CUT
D23/D27/D31
1
0
Output (dB)
15
12
10
8
6
4
2
0
D20/D24/D28
1
1
1
1
0
0
0
0
D21/D25/D29
1
1
0
0
1
1
0
0
D22/D26/D30
1
0
1
0
1
0
1
0
Output (dB)
– ∞
–60
–45
–30
–25
–20
–18
–16
–14
–12
–10
–8
–6
–4
–2
0
D32
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D33
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D34
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D35
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Page 10
—10—
CXA2546Q
FADER SELECT
RESET
Reset is performed automatically when power is first supplied to the IC; there is no reset pin.
The following table shows the respective statuses of various settings after a reset has been performed.
Mode
FRONT
REAR
D36
1
0
Mode
INPUT
VRC1
VRF1
VRC2
VRF2
LOUD
TONE BASS
TONE MID
TONE TREBLE
FADER
Set value
1
– ∞ dB
–1 dB
– ∞ dB
–1 dB
OFF
0 dB
0 dB
0 dB
0 dB, REAR
Page 11
—11—
CXA2546Q
Timing Chart
Timer Waiting Period Setting Chart (VCC=7 to 12 V, operating temperature=–40 °C to 85 °C)
Waiting period
Min. Typ. Max.
3 µs 5 µs 9 µs
30 µs 50 µs 90 µs
300 µs 500 µs 900 µs
3 ms 5 ms 9 ms
30 ms 50 ms 90 ms
300 ms 500 ms 900 ms
TIMER pin
capacitance C
C=100 pF
C=0.001 µF
C=0.01 µF
C=0.1 µF
C=1 µF
C=10 µF
tce
CE
DATA
CLK
CE
D1 D2 D34 D35 D36 Invalid D1 D2
t1 tck tsu th t2 tL
t1 ≥ 0.5µs
t2 ≥ 0.5µs
tck ≥ 1.0µs
tsu ≥ 0.5µs
th ≥ 0.5µs
tce ≥ 4.0µs
tL ≥ tT+0.5µs
(tT is the maximum value for the timer operation time)
D1 for the next data transfer
to the CXA2546 is shifted
at this clock rise.
Page 12
—12—
CXA2546Q
Item Symbol Conditions Min. Typ. Max. Unit
— 25 35 mA
— 0.004 0.01 %
— 8 10 µVrms
8 — — dBm
72 90 —
85 90 —
13 15 17
5 6 7
13 15 17
dB
13 15 17
13 15 17
13 15 17
13 15 17
13 15 17
3 — 6
0 — 1.5
1 — VCC–1
V
No signal
1 kHz, 5 dBm output
Short-circuit at input, A weight
1 kHz
1 kHz
100 Hz, VRC=–32 dB
10 kHz, VRC=–32 dB
DATA, CLK, CE
DATA, CLK, CE
IN11 to 14 The IC is not
IN21 to 24 destroyed or
VRIN1, 2 does not operate
FDIN1, 2 abnormally.
ICC
THD
Vn
Vom
CS
ATTm
Glb
Glh
Gbb
Gbc
Gmb
Gmc
Gtb
Gtc
Vsh
Vsl
Vin
Current consumption
Total harmonic distortion
Output noise voltage
Max. output voltage
Separation
Max. attenuation factor
Loudness LOW boost
Loudness HIGH boost
Max. Bass boost gain
Max. Bass cut gain
Max. Mid boost gain
Max. Mid cut gain
Max. Treble boost gain
Max. Treble cut gain
Input voltage HIGH
Input voltage LOW
Input voltage range
Electrical Characteristics
VCC=8 V, Ta=25 °C, input=0 dB unless otherwise specified
Page 13
—13—
CXA2546Q
Electrical Characteristics Measurement Circuit
GAIN234
LDLC2
LDHC2
INAO2
VRIN2
TCHC2
TCMC21
TCMC22
TCLC21
TCLC22
TCO2
FDIN2
GAIN134
LDLC1
LDHC1
INAO1
VRIN1
TCHC1
TCMC11
TCMC12
TCLC11
TCLC12
TCO1
FDIN1
FNTO1
FNTO2
GAIN22
R5
10k
C1
0.22µ
C3
820P
C5
10µ
C7
0.0027µ
C9
0.033µ
C11
0.022µ
C13
10µ
C15
0.39µ
C17
10µ
A
B
AC
V6
R7
10k
R8
10k
A
B
R14
10k
C20
0.01µ
V1
VEE
S4
C19
100µ
VCC
R12
10k
R13
10k
V2
V3
R15
10k
V5
AC
1k
R19
C21
220p
R15
10k
R20
1k
R18
1k
OPAMP
R17
10k
CE
CLK
DATA
S1
C18
B
V4
AC
A
S5_A
10µ
C15
0.39µ
C14
10µ
C12
0.022µ
C10
0.033µ
C8
0.0027µ
S2
C6
10µ
820P
C4
0.22µ
C2
10k
R5
10k
R4
10k
R2
AC
V14
S14
B
A
AC
V13
S13
B
A
S12
AC
V12
S11
AC
V11
S21
AC
V21
S22
AC
V22
S23
AC
V23
S24
AC
V24
R3
R1
10k
10k
S5_B
-60dBm
B
A
B
A
B
A
B
A
B
A
B
A
B
A
S3
20
19
18
17
16
15
14
22
21
23
13
24
35
34
33
32
31
30
29
28
27
26
25
36
10
2
3
4
5
6
7
8
9
1
11
12
48
45
44
43
42
41
40
39
38
37
46
47
GAIN11
IN14
IN13
IN12
IN11
IN21
IN22
IN23
IN24
GAIN21
REO1
CE
CLK
DGND
GND
V
CC
VCT
DATA
TIMER
REO2
3.5 to 6V
5V
0V
5V
0V
5V
0V
3.5 to
6V
GAIN12
Page 14
—14—
CXA2546Q
Application Circuit
GAIN234
LDLC2
LDHC2
INAO2
VRIN2
TCHC2
TCMC21
TCMC22
TCLC21
TCLC22
TCO2
FDIN2
FNTO1
FNTO2
GAIN22
C1
0.22µ
C3
820P
C5
10µ
C7
0.0027µ
C9
0.033µ
C11
0.022µ
C13
10µ
C15
0.39µ
C17
10µ
R7
10k
R8
10k
C20
0.01µ
C19
33µ
R12
10k
R13
10k
TO POWER SUPPLY
C18
10µ
C15
0.39µ
C14
10µ
C12
0.022µ
C10
0.033µ
C8
0.0027µ
C6
10µ
820P
C4
0.22µ
C2
TO CPU
C21
10µ
OUTPUT SIGNAL
GAIN134
LDLC1
LDHC1
INAO1
VRIN1
TCHC1
TCMC11
TCMC12
TCLC11
TCLC12
TCO1
FDIN1
20
19
18
17
16
15
14
22
21
23
13
24
22k
2.2k
22k
2.2k
35
34
33
32
31
30
29
28
27
26
25
36
48
45
44
43
42
41
40
39
38
37
46
47
10
2
3
4
5
6
7
8
9
1
11
12
GAIN11
IN14
IN13
IN12
IN11
IN21
IN22
IN23
IN24
GAIN21
GAIN12
INPUT SIGNAL
SOURCES
REO1
CE
CLK
DGND
GND
V
CC
VCT
DATA
TIMER
REO2
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.
Page 15
—15—
CXA2546Q
Description of Operation
(1) Input amplifier gain
(2) LOUD
The loudness function achieves the necessary frequency response by using a filter as shown below. The
resistors are built in this IC so that fL and fH can be set by selecting C1 and C2.
Rint
33
38
37
36
VCT
Rext
INAO1
39
40
41
42
IN14
IN13
IN12
IN11
GAIN134
GAIN12
GAIN11
Gain=1+
Rint
Rext
Rint is included in this IC, (22kΩ)
No Rext → 0 dB
R1=1.08k
R2=24.05k
38.8k
13.02k
CXA2546Q
3
4
LDHC1
LDHC2
C2
32
5
VRIN1
VRIN2
3
5
LDLC1
LDLC2
VCT
VCT
fL
fH
fL=1/ (2πC1R1)
fH=1/ (2πC2R2)
C1
Page 16
—16—
CXA2546Q
(3) Tone control
BASS : LPF
MID : BPF
TREBLE : HPF
VCT
8k
8k
R1=8k
VCT
C1
27
18
TCLC12
TCLC22
VCT
R2=8k
fL
fL=1/ (2πC1R1//R2)
CXA2546Q
4k
4k
16k
HPF
16k
VCT
R4=8k
C3C2
VCT
VCT
29
8
TCMC12
TCMC22
28
7
TCMC11
TCMC21
CXA2546Q
fH fL
fM
LPF
R3=4k
fL=1/ (2πC2R3)
fH=1/ (2πC3R4)
10k
10k
10k
10k
R5=5k
CXA2546Q
C4
VCT
VCT
3
1
TCHC11
TCHC21
fH
fH=1/ (2πC4R5)
Page 17
—17—
CXA2546Q
(4) Zero-cross detector and timer
A built-in zero-cross detection circuit is used to detect the zero-cross points of the input signal. When data
arrived at the IC, they are executed at the next zero-cross point or when there is no input signal. This is to
minimize 'click' noise during the transition of levels.
The timer circuit is added to ensure that the data is executed even when a zero-cross point is not detected
after a certain period of time from the falling edge of the CE pulse.
(5) VCT pin
The internal circuit of VCT pin has the following structure.
Insert a buffer when using it as a reference voltage for an external circuit.
(6) Power-off mute
When VCC goes below 5 V, the output stage bias of the fader output pins FNTO1, FNTO2, REO1, and
REO2 is turned off and the pins go to high impedance. This operation prevents popping noises caused by
the output pin potential deviating from VCC/2 when the power is turned off.
VCC
CE
C
TIMER
CXA2546Q
10µA
0.5V
15
Time constant=(0.5/10µ) × C [s]
100k
100k
CXA2546Q
17
VCT
GND
V
CC
Page 18
—18—
CXA2546Q
Example of Representative Characteristics
20
10
0
–10
–20
1 10 100 1k 10k 100k
MIDBASS TREBLE
15dB
–15dB
1 10 100 1k 10k 100k
10
0
–10
–20
–40
–30
VRC=0dB
V
RC=–10dB
VRC=–20dB
V
RC=–30dB
V
RC=–40dB
Tone control frequency response
Voltage (dB)
Frequency (Hz)
Loudness frequency response
Voltage (dB)
Frequency (Hz)
Page 19
SONY CODE
EIAJ CODE
JEDEC CODE
M
PACKAGE STRUCTURE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE MASS
EPOXY RESIN
SOLDER / PALLADIUM
PLATING
42/COPPER ALLOY
48PIN QFP (PLASTIC)
15.3 ± 0.4
12.0 – 0.1
+ 0.4
0.8
0.3 – 0.1
+ 0.15
0.24
13
24
2536
37
48
1 12
2.2 – 0.15
+ 0.35
0.9 ± 0.2
0.1 – 0.1
+ 0.2
13.5
0.15 – 0.05
+ 0.1
QFP-48P-L04
QFP048-P-1212
0.7g
0.15
Package Outline Unit : mm
CXA2546Q
—19—
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
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