MAX9598 Maxim Integrated Products, MAX9598 Datasheet - Page 12

• Manufacturer Part Number: MAX9598
• Description: Low-Power Audio/Video Switch
• Manufacturer: Maxim Integrated Products

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The audio circuit is essentially a stereo, 2x2, nonblock-
ing, audio crosspoint with output drivers. The encoder
(stereo audio DAC) and the VCR are the two input
sources, and the two outputs go to the TV SCART con-
nector and the VCR SCART connector. See Figure 1.
Low-Power Audio/Video Switch for
Dual SCART Connectors
12
Figure 1. MAX9598 Audio Section Functional Diagram
______________________________________________________________________________________
ENC_INR
VCR_INR
ENC_INL
VCR_INL
CPVSS
VAUD
C1P
C1N
MAX9598
Audio Section
ZERO-CROSS
ZERO-CROSS
DETECTOR
DETECTOR
CHARGE
PUMP
EP
EP
EP
EP
The integrated charge pump inverts the +3.3V supply
to create a -3.3V supply. The audio circuit operates
from bipolar supplies so the audio signal is always
biased to ground.
A
A
A
A
V
V
V
V
VAUD
= 4V/V
VAUD
= 4V/V
VAUD
= 4V/V
VAUD
= 4V/V
TV_OUTL
VCR_OUTL
TV_OUTR
VCR_OUTR