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5002B

Dual SCART A/V Switch

TDK Corporation 

AVPro® 5002B

Dual SCART A/V Switch

Register 4: Audio control register C

Function

TV volume control select 1

TV volume control select 2

Not used

Audio1 control

( Note 1 )

Audio2 control

TV source mixer control

( Note 2 )

Bits

xxxxxxx0

xxxxxxx1

xxxxxx0x

xxxxxx1x

xxxxx 0xx

xxxx0xxx

xxxx1xxx

xx00xxxx

xx01xxxx

xx1xxxxx

00xxxxxx

01xxxxxx

1xxxxxxx

Description

Volume control on TV_Lout, TV_Rout

TV_Lout, TV_Rout bypass the volume control

Volume control on Lout, Rout

Lout, Rout bypass the volume control

Reserved, set to 0 for normal operation

Audio1 input is active

Audio1 input disabled

Audio2 level = 0 dB attenuation

Audio2 level = 20 dB attenuation

Audio2 input disabled

TV source = 0 dB attenuation (bypass attenuator/summing node)

TV source level = 20 dB attenuation

TV source disabled

Note 1 Audio1 exhibits excessive DC offset in the disabled state( xxxx1xxx ). This DC offset can propagate to

audio outputs Lout, Rout, TV_Lout and TV_Rout if care is not taken. There are two ways to avoid

excessive DC offset at the audio outputs:

1. Activate Audio1 with register setting xxxx0xxx. The input pin can be either left floating or actively

driven, or

2. Bypass attenuator ‘A’ and the summing node with register code 00xxxxxx. By bypassing the

summing node, the offset at Audio1 will be blocked from the audio path. In this case, the state of

Audio1 control does not impact output DC offset.

Note 2 This effects both the TV audio outputs (TV_Lout, TV_Rout, Lout, Rout) and the Mod_mono audio output.

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