CXA2126 Sony Corporation, CXA2126 Datasheet - Page 31

• Manufacturer Part Number: CXA2126
• Description: Audio/Video Switch with Electronic Volume for 2 Scart
• Manufacturer: Sony Corporation

TV output amplifier
Note) After power on the gain is set to 0dB.
TV Mono Switch
VCR Mono Switch
Mute and Zero Cross Operation
For TV, phono and mono outputs.
There are two mute control bits in the bus map to allow the TV outputs to be muted before the channel change
instruction occurs. The normal structure for a click free audio channel change is as follows:
Note) After power on TV mute and ZCD are set to 0.
Data 1 Mute the TV audio output with the ZCD switched on
Data 2 Change the TV audio source.
Data 7 Un-mute the TV audio output again with the ZCD switched on.
TV Aud Mute Data 1 Bit 1
x 0 x x x x x x = 0dB
x 1 x x x x x x = +6dB
x x x x 0 x x x = Normal stereo output
x x x x 1 x x x = Mono signal switched onto R + L Iine.
x x x 0 x x x x = Normal stereo output
x x x 1 x x x x = Mono signal switched onto R + L Iine.
0
0
1
1
Data 7 Bit 7
Data 7 Bit 3
Data 7 Bit 4
Data 7 Bit 6
ZCD Data 1 Bit 0
0
1
0
1
– 31 –
Un-mute immediately
Un-mute on next zero cross
Mute immediately
Mute on next zero cross
RTV, LTV, Phono_R, Phono_L, Mono outputs
CXA2126Q