CXA2126 Sony Corporation, CXA2126 Datasheet - Page 23

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

Zero Cross Detector (ZCD)
The zero cross detector reduces the effect of "click noise" when implementing a volume change or an audio
mute. The change volume or mute instruction sent by I
cross) signal amplitude is detected.
The zero cross detection circuit can be turned off by setting the "ZCD" bit low in the I
Hardware Mute
A hardware mute pin is provided which will mute all audio outputs when the pin voltage exceeds 2.5V. This
muting is instantaneous.
VCR Output
The outputs ROUT1 and LOUT1 have a fixed gain of 0dB from the input. If any attenuation is required then it is
possible to insert a series resistance on the input. (Fig. 2-2)
Phono Outputs
There is a stereo phono output which carries the same signal as the TV output. This is typically used for
connection to a hi-fi. The user may connect an external attenuator which is a.c. coupled to the outputs.
Mono Output
The mono output is a mix of the TV right and left channels.
Audio
Source
1 F
RIN1
RIN2
RIN3
LIN1
LIN2
LIN3
12
22
14
24
3
5
–6dB
–6dB
–6dB
–6dB
Fig. 2-2. VCR Audio Output
Mute
VCR Audio Output
– 23 –
2
C will only be implemented when a minimal (ie zero
SWITCH
MONO
2
2
34
36
2
C write mode.
ROUT1
LOUT1
560
Optional
Low Pass Filter
10 F
C
Scart Pin
CXA2126Q