CXA1946AQ Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

Fabricante

CXA1946AQ

Electronic Volume

Sony Semiconductor 

VCT

CXA1946AQ/AR

GAINX2

GAINX1

GAINX34

INAOX

INX4

50k

INX3

50k

INX2

50k

INX1

50k

Fig. 2. Input Selector (2)

2. Volume

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.

3. Loudness

The configuration of the loudness circuit is shown in Fig. 3. CLDHCX and CLDLCX are connected externally,

and the loudness frequency characteristics are determined by these constants. The relationships between

CLDHCX/CLDLCX and the frequency characteristics are as follows:

1/fL = 2πCLDLCXR1

1/fH = 2πCLDHCXR2

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.

VRINX (input impedance 9.5kΩ)

CLDHCX

0.0022µ

CLDLCX

0.047µ

20k

R2

8.92k

LDHCX

25.7k

20k

4.98k

OFF

ON

LOUD

R1

6.18k

LDLCX

Total 40k

fH

fL

Loudness frequency

characteristics

VOUTX

Loudness

Volume

Fig. 3. Volume and Loudness

– 18 –

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