TDA7417 datasheet(21/34 Pages) STMICROELECTRONICS

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TDA7417

Description of the audioprocessor

21/34

4.10

IN/OUT control

IN/OUT control offers selectable full-differential stereo input or Bass output as figure15

shown. When used as full-differential input, bass buffer output is disabled, full-differential

input switch sw1(sw4) closes and sw2(sw3) closes. When used as bass output, full-

differential input switch sw1(sw4) opens and sw2(sw3) still closes, single ended bass output

signal is converted to full differential output. IN/OUT control supports high impedance status

when bass buffer output is disabled, full-differential input switch sw1(sw4) opens and

sw2(sw3) closes.

Figure 17.

IN/OUT control

4.11

Audioprocessor Testing

In the test mode, which can be activated by setting bit D7 of the IIC subaddress byte and bit

D0 of the testing audioprocessor byte, several internal signals are available at the QDL pin.

In this mode, the input resistance of 100kOhm is disconnected from the pin. Internal signals

available for testing are listed in the data-byte specification. External clock can be available

at the SE1R pin.

Enable

3.5dB

-3.5dB

sw1

sw2

50k

sw3

sw4

–1

BassOUTL

FDL

OUT/INL+

OUT/INL-

AC00063

TDA7417 Datasheet(PDF) 21 Page - STMicroelectronics