SONY CXA2547Q

CXA2547Q
2-band Electronic Volume
For the availability of this product, please contact the sales office.
Description
The CXA2547Q 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 (8 dB-step)
• Balance
• Tone control
(2-band, 2 dB-step from –15 dB to +15 dB)
• Fader
2 dB-step to –20 dB, –25 dB, –35 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
48 pin QFP (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
PD
350
mW
(Ta=85 °C)
Recommended Operating Conditions
Supply voltage
VCC
7 to 12
V
Structure
Bipolar silicon monolithic IC
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—
E97Y19B91-TE
CXA2547Q
GAIN134
LDLC1
LDHC1
INAO1
VRIN1
TCHC1
NC
NC
TCLC11
TCLC12
TCO1
FDIN1
Block Diagram and Pin Configuration
36
35
34
33
32
31
30
29
28
27
26
25
GAIN12 37
24 FNTO1
LOUD
VOLUME
2dB STEP
GAIN11 38
INPUT SWITCH
IN14 39
IN13 40
IN12 41
VOLUME
1dB STEP
TONE
FADER
VCTBUFF
22 CE
VCTBUFF
21 CLK
VCTBUFF
20 DGND
ZCDET
VOL
LATCH
CONTROL
LATCH
IN11 42
ZCDET
19 GND
SHIFT REGISTER
INPUT SWITCH
IN21 43
IN22 44
IN23 45
IN24 46
18 VCC
VCTBUFF
17 VCT
ZCDET
VCTBUFF
VOL
16 DATA
VCTBUFF
15 TIMER
VOLUME
2dB STEP
GAIN21 47
VOLUME
1dB STEP
TONE
FADER
LOUD
LOUD
14 REO2
1
2
3
4
5
6
7
8
9
10
11
12
LDLC2
LDHC2
INAO2
VRIN2
TCHC2
NC
NC
TCLC21
TCLC22
TCO2
FDIN2
13 FNTO2
GAIN234
GAIN22 48
23 REO1
—2—
CXA2547Q
Pin Description
Pin
No.
Symbol
I/O resistance
Pin voltage
Equivalent circuit
Description
VCC
2
35
LDLC2
LDLC1
1.08 k
VCT
Sets loudness low cut-off
frequency.
2
35
GND
VCC
3
34
LDHC2
LDHC1
24.05 k
VCT
Set loudness high cut-off
frequency
3
34
GND
VCC
4
33
INAO2
INAO1
—
VCT
4
Input selector output
33
GND
VCC
5
32
VRIN2
VRIN1
10 k
VCT
5
Volume input
32
GND
VCC
6
31
TCHC2
TCHC1
5k
VCT
6
Set tone Treble frequency
31
GND
—3—
CXA2547Q
Pin
No.
7
30
8
29
Symbol
I/O resistance
Pin voltage
NC
—
NC
—
Equivalent circuit
Description
VCC
9
28
TCLC21
TCLC11
8k
VCT
9
Sets tone Bass frequency
28
GND
VCC
10
27
TCLC22
TCLC12
8k
VCT
10
Sets tone Bass frequency
27
GND
VCC
11
26
TCO2
TCO1
—
VCT
11
Tone control output
26
GND
—4—
CXA2547Q
Pin
No.
Symbol
I/O resistance
Pin voltage
Equivalent circuit
Description
VCC
12
25
FDIN2
FDIN1
24 k
VCT
12
Fader input
25
GND
VCC
13
24
REO2
REO1
—
VCT
13
Rear output
24
GND
VCC
14
23
FNT02
FNT01
—
VCT
14
Front output
23
GND
VCC
15
TIMER
~∞
15
Timer constant setting
—
GND
VCC
16
DATA
~∞
124 4k
16
Serial data input
—
GND
—5—
CXA2547Q
Pin
No.
Symbol
17
VCT
18
VCC
19
GND
20
DGND
I/O resistance
Pin voltage
—
VCT
—
VCC
—
Gnd
—
—
Equivalent circuit
Description
1/2 VCC
Power supply input
Ground
Digital ground
VCC
21
CLK
~∞
124 4k
21
Serial clock input
—
GND
VCC
20k
22
CE
~ 20k
22
124 4k
Latch enable input
Take care to set the low level
as the input impedance is low.
—
GND
VCC
1
36
37
38
47
48
GAIN234
GAIN134
GAIN12
GAIN11
GAIN21
GAIN22
1
~∞
VCT
36
External gain setting for input
amplifier
37
38
47
48
GND
39
40
41
42
43
44
45
46
IN14
IN13
IN12
IN11
IN21
IN22
IN23
IN24
VCC
50 k
VCT
39 40
41 42
Signal input
43 44
45 46
GND
—6—
CXA2547Q
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
NOP
TONE TREBLE
FADER
FADER SELECT
—7—
CXA2547Q
ISW
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
LOUD
Mode
ON
OFF
D5
1
0
VRC1/VRC2
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
—8—
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
—
—
—
—
—
—
—
—
—
—
CXA2547Q
VRF1/VRF2
Output (dB)
0
–1
D12/D19
1
0
BASS/TREBLE
Output (dB)
15
12
10
8
6
4
2
0
D20/D28
1
1
1
1
0
0
0
0
D21/D29
1
1
0
0
1
1
0
0
D22/D30
1
0
1
0
1
0
1
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
BOOST/CUT
Mode
BOOST
CUT
D23/D31
1
0
FADER
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
—9—
D35
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
CXA2547Q
FADER SELECT
Mode
FRONT
REAR
D36
1
0
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
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
∗ Set all the transfer data to “0” for D24, D25, D26 and D27.
—10—
CXA2547Q
Timing Chart
CE
DATA
D1
D2
D34
D35
D36
Invalid
D1
D2
CLK
t1
tck
t1 ≥ 0.5µs
t2 ≥ 0.5µs
tck ≥ 1.0µs
tsu ≥ 0.5µs
th ≥ 0.5µs
tsu
th
t2
tL ≥ tT +0.5µs
(tT is the maximum value for the timer operation time)
tL
D1 for the next data transfer
to the CXA2547 is shifted
at this clock rise.
CE
tce
tce ≥ 4.0µs
Timer Waiting Period Setting Chart (VCC=7 to 12 V, operating temperature=–40 °C to 85 °C)
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
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
—11—
CXA2547Q
Electrical Characteristics
VCC=8 V, Ta=25 °C, input=0 dB unless otherwise specified
Item
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. Treble boost gain
Max. Treble cut gain
Input voltage HIGH
Input voltage LOW
Input voltage range
Symbol
ICC
THD
Vn
Vom
CS
ATTm
Glb
Glh
Gbb
Gbc
Gtb
Gtc
Vsh
Vsl
Vin
Conditions
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.
—12—
Min.
—
—
—
8
72
85
13
5
13
13
13
13
3
0
1
Typ.
25
0.004
8
—
90
90
15
6
15
15
15
15
—
—
—
Max.
35
0.01
10
—
—
—
17
7
17
17
17
17
6
1.5
VCC–1
Unit
mA
%
µVrms
dBm
dB
V
A
B S12
A
IN24
48
1
3
2
47 GAIN21
46
45 IN23
44 IN22
43 IN21
42 IN11
IN12
C5
5
4
6
8
7
9
C13
10
C17
10µ
V6
A B
AC
12
11
REO2
TIMER
DATA
VCT
VCC
GND
DGND
40 IN13
41
CLK
10k
R7
10k
C20
R14
0.01µ
B
S3 A
R8
S4
10k
FNTO2
13
14
15
16
17
18
19
20
21
CE 22
10µ
FNTO1
R13
24
10k
R12
REO1 23
10k
25
B
V4
AC
39 IN14
10µ
26
27
28
C18
A
10µ
29
10µ
C14
30
B
31
38 GAIN11
37
GAIN22
A
B S24
A
B S23
A
B S22
A
B S21
A
B S11
A
B S13
AC
B S14
GAIN12
V14
AC
V12
V13
AC
AC
AC
V11
V21
32
R5
GAIN234
10k
C1
AC
33
LDLC2
0.22µ
C3
V22
34
LDHC2
AC
35
INAO2
V23
36
VRIN2
V24
10k
A
NC
AC
R1
10µ
C7
0.0027µ
NC
R2
10k
R4
10k
R3
GAIN134
C15
10k
LDLC1
R5
LDHC1
10k
C2
0.22µ
INAO1
820P
VRIN1
C8
0.0027µ
TCHC1
TCHC2
NC
TCLC21
NC
C4
820P
C6
0.39µ
TCLC11
S2
C15
TCLC22
TCLC12
0.39µ
C19
TCO1
TCO2
100µ
1k
R18
AC
-60dBm V5
R15 R15 R17
10k 10k 10k
VCC
3.5~
6V
VEE
3.5~6V
FDIN1
FDIN2
V3
V2
1k
S5_A
S5_B
—13—
V1
S1
R19
Electrical Characteristics Measurement Circuit
DATA
CLK
CE
220p
R20
1k
C21
OPAMP
5V
0V
5V
0V
5V
0V
CXA2547Q
22k
2.2k
GAIN22
48
2
3
10µ
C5
5
4
6
8
7
9
C13
10µ
10
17
16
15
14
VCT
DATA
TIMER
REO2
C17
12
11
10µ
18
VCC
R7
R8
10k
10k
C20
0.01µ
FNTO2
13
19
GND
20
21
22
FNTO1
R13
24
10k
R12
23
10k
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.
1
GAIN234
GAIN21
LDLC2
47
46 IN24
45 IN23
44 IN22
43 IN21
IN11
DGND
41 IN12
C1
42
CLK
REO1
40 IN13
INAO2
CE
VRIN2
39 IN14
38 GAIN11
NC
GAIN12
37
25
26
27
28
29
30
31
32
33
34
10µ
C18
35
10µ
C14
36
10µ
C6
C7
0.0027µ
NC
INPUT SIGNAL
SOURCES
2.2k
GAIN134
0.22µ
C3
LDLC1
C2
0.22µ
C4
820P
LDHC1
LDHC2
INAO1
820P
VRIN1
C8
0.0027µ
TCHC1
TCHC2
NC
TCLC21
NC
C15
22k
C15
TCLC11
0.39µ
TCLC12
TCLC22
TCO1
0.39µ
C19
FDIN1
TCO2
—14—
FDIN2
33µ
Application Circuit
TO POWER SUPPLY
TO CPU
OUTPUT SIGNAL
CXA2547Q
10µ
C21
CXA2547Q
Description of Operation
(1) Input amplifier gain
36 GAIN134
37 GAIN12
38 GAIN11
Rext
33
VCT
INAO1
Rint
39 IN14
Rint is included in this IC, (22kΩ)
40 IN13
41 IN12
Rint
Rext
Gain=1+
42 IN11
No Rext → 0 dB
(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.
fL=1/ (2πC1R1)
fH=1/ (2πC2R2)
3 LDHC1
4 LDHC2
R2=24.05k
C2
38.8k
fH
13.02k
32 VRIN1
5 VRIN2
R1=1.08k
VCT
CXA2547Q
3 LDLC1
C1
5 LDLC2
VCT
—15—
fL
CXA2547Q
(3) Tone control
BASS : LPF
fL=1/ (2πC1R1//R2)
R1=8k
fL
8k
R2=8k
8k
VCT
CXA2547Q
VCT
27 TCLC12
C1
18 TCLC22
VCT
TREBLE : HPF
fH=1/ (2πC4R5)
10k
10k
VCT
10k
10k
R5=5k
CXA2547Q
C4
3 TCHC11
1 TCHC21
VCT
—16—
fH
CXA2547Q
(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.
Time constant=(0.5/10µ) × C [s]
VCC
10µA
0.5V
CE
15
CXA2547Q
TIMER
C
(5) VCT pin
The internal circuit of VCT pin has the following structure.
Insert a buffer when using the pin as a reference voltage for an external circuit.
VCC
100k
VCT 17
100k
CXA2574Q
GND
(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.
—17—
CXA2547Q
Example of Representative Characteristics
Tone control frequency response
20
16
+15
12
4
0
–4
–8
–12
–15
–16
–20
10
100
1k
10k
100k
Frequency (Hz)
Loudness frequency response
10
VRC=0dB
0
Voltage (dB)
Voltage (dB)
8
–10
VRC=–10dB
VRC=–20dB
–20
VRC=–30dB
–30
VRC=–40dB
–40
1
10
100
Frequency (Hz)
—18—
1k
10k
100k
CXA2547Q
Package Outline
Unit : mm
48PIN QFP (PLASTIC)
15.3 ± 0.4
+ 0.1
0.15 – 0.05
+ 0.4
12.0 – 0.1
0.15
36
25
24
13.5
37
48
+ 0.2
0.1 – 0.1
13
12
0.8
+ 0.15
0.3 – 0.1
0.24
M
0.9 ± 0.2
1
+ 0.35
2.2 – 0.15
PACKAGE STRUCTURE
SONY CODE
QFP-48P-L04
EIAJ CODE
QFP048-P-1212
JEDEC CODE
PACKAGE MATERIAL
EPOXY RESIN
LEAD TREATMENT
SOLDER / PALLADIUM
PLATING
LEAD MATERIAL
42/COPPER ALLOY
PACKAGE MASS
0.7g
NOTE : PALLADIUM PLATING
This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
—19—