CXA1946BQ Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

Fabricante

CXA1946BQ

Electronic Volume

Sony Semiconductor 

CXA1946BQ/BR

Description of Operation

The CXA1946BQ/BR is a serial control electronic volume IC designed for use in audio systems.

The internal circuit of the IC consists of the following blocks:

1. Input selector

2. Volume

3. Loudness

4. Tone control

5. Fader

6. VCT buffer

7. Serial data I/O

8. Zero-cross detector (with timer)

9. Power-off mute

The operation of each block and notes on their use are described below.

Note that when the circuits for channels 1 and 2 are identical, the suffix “X” is added to pin names and device

names in order to distinguish between the two channels.

1. Input selector

There are two channels (stereo), each with four systems of input pins; the input selector selects one of

those input systems.

The gain between the input pins and the output pin of the input selector can be set independently for each

input system, except the gain for inputs 3 and 4 is common.

Determine the gain for each system through the settings of the feedback circuit constants as shown in Figs.

1 and 2. When each input gain is set to × 1, short INAOX and GAIN × 1,GAIN × 2,GAIN × 34.

The input impedance is 50kΩ (typ.) for each input.

The output impedance for INAO1 and INAO2 is low impedance (roughly 0Ω). The gain is not affected by the

load impedance.

VCT

GAINX2

GAINX1

INX4

50k

INX3

50k

INX2

50k

INX1

50k

GAINX34

INAOX

Fig. 1. Input Selector (1)

– 17 –

Share Link: