MAX4397 datasheet(14/30 Pages) MAXIM

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Audio Outputs

Both right and left channels have a stereo output for the

TV and VCR SCART. The monaural output, which is a

mix of the TV right and left channels, drives the RF

modulator, RF_MONO_OUT. The monaural mixer, a

resistor summer, attenuates the amplitude of each of

the two signals by 6dB. A 12.54dB gain block follows

the monaural mixer. If the left and right audio channels

were completely uncorrelated, then a 9.54dB gain

block is used. See Figures 3 and 4 for the functional

diagram of the audio section.

Clickless Switching

The TV channel incorporates a zero-crossing detect

(ZCD) circuit that minimizes click noise due to abrupt

signal level changes that occur when switching

between audio signals at an arbitrary moment.

Audio/Video Switch for Dual SCART Connectors

______________________________________________________________________________________

ENC_INL+

AUDIO INPUTS

AUDIO OUTPUTS

ENC_INL-

TV_INL

VCR_INL

DIFF/SE

MUTE

Σ/2

MUTE

MUTE IS AN INTERNAL SIGNAL

-6dB, 0dB, OR +6dB

9.54dB

12.54dB

GNDAUD

9.54dB

ZCD

TV_OUTL

RF_MONO_OUT

TV_OUTR

VOLUME CONTROL BYPASS

VOLUME CONTROL

+6dB TO -56dB

VOLUME CONTROL

+6dB TO -56dB

I2C

VCR_OUTL

VCR_OUTR

9.54dB

ENC_INR+

ENC_INR-

TV_INR

VCR_INR

VOLUME CONTROL BYPASS

Figure 3. MAX4397D Audio Section Functional Diagram

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