CXA1946 SONY [Sony Corporation], CXA1946 Datasheet - Page 18

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CXA1946

Manufacturer Part Number
CXA1946
Description
Electronic Volume
Manufacturer
SONY [Sony Corporation]
Datasheet

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2. Volume
3. Loudness
The volume circuit consists of two sections, an 8dB/step section and a 1dB/step section, as shown in Fig. 3.
This circuit also serves as a balance control because the volume for channel 1 and channel 2 can be set
independently.
To mute the output signal, send –∞dB data.
The input impedance is 9.5kΩ (typ.) for VRIN1 and VRIN2.
The output impedance for VOUT1 and VOUT2 is low impedance (roughly 0Ω). The volume step width and
gain are not affected by the load impedance.
The configuration of the loudness circuit is shown in Fig. 3. C
and the loudness frequency characteristics are determined by these constants. The relationships between
C
The loudness characteristics are not affected by the load impedance of VOUT1 and VOUT2.
Loudness is turned on and off by serial data bit D5.
LDHCX
0.0022µ
C
LDHCX
1/f
1/f
/C
L
H
C
0.047µ
= 2πC
LDLCX
= 2πC
LDLCX
and the frequency characteristics are as follows:
LDLCX
LDHCX
LDHCX
LDLCX
VRINX (input impedance 9.5k )
8.92k
R
R2
R
INX4
INX3
INX2
INX1
1
25.7k
2
20k
GAINX2
GAINX1
4.98k
Loudness
50k
50k
50k
50k
6.18k
R1
20k
LOUD
Fig. 3. Volume and Loudness
VCT
OFF
ON
Fig. 2. Input Selector (2)
GAINX34
– 18 –
Total 40k
LDHCX
and C
Volume
Loudness frequency
characteristics
INAOX
f
L
LDLCX
are connected externally,
f
H
VOUTX
CXA1946AQ/AR

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