MAX9597CTI+T Maxim Integrated Products, MAX9597CTI+T Datasheet - Page 14

• Manufacturer Part Number: MAX9597CTI+T
• Description: IC AUD/VID INTERACE 28TQFN-EP
• Manufacturer: Maxim Integrated Products
• Type: Audio/Video Interfacer

Specifications of MAX9597CTI+T

• Applications: DVD, Set-Top Boxes
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

video transmitter circuit might have a different ground
than the video receiver, thereby level shifting the DC
bias. The 50Hz power line hum might cause the video
signal to change DC bias slowly.
Internal video signals that are between 0V and 1V can
be DC-coupled. Most video DACs generate video sig-
nals between 0V and 1V because the video DAC
sources current into a ground-referenced resistor. For
the minority of video DACs that generate video signals
between 2.3V and 3.3V because the video DAC sinks
current from a V
video signal to the MAX9597.
The MAX9597 restores the DC level of incoming,
AC-coupled video signals with either transparent sync-
tip clamps or bias circuits. When using an AC-coupled
input, the transparent sync-tip clamp automatically
clamps the input signal minimum to ground, preventing it
Low-Power Audio/Video Interface
for Single SCART Connectors
Figure 3. MAX9597 Video Section Function Diagram
14
______________________________________________________________________________________
DD
-referenced resistor, AC-couple the
ENC_CVBS_IN
ENC_R/C_IN
ENC_G_IN
ENC_B_IN
CLAMP/BIAS
CLAMP
CLAMP
CLAMP
V
GND
V
+6V
VID
12
EP
LPF
LPF
LPF
LPF
from going lower. A small current of 2µA pulls down on
the input to prevent an AC-coupled signal from drifting
outside the input range of the part. The transparent sync-
tip clamp is used with CVBS, RGB, and luma signals.
The transparent sync-tip clamp is transparent when the
incoming video signal is DC-coupled and at ground or
above. Under such conditions, the clamp never acti-
vates. Therefore, the outputs of video DACs that gener-
ate signals between 0V and 1V can be directly
connected to the MAX9597 inputs.
The bias circuit accepts AC-coupled chroma, which is
a subcarrier with the color information modulated onto
it. The bias voltage of the bias circuits is around
600mV.
ENC_R/C_IN can receive either a red video signal or a
chroma video signal. Set the input configuration by writ-
ing to bit 3 of register 08h. See Table 10.
MAX9597
A
A
A
A
A
A
V
V
V
V
V
V
= 2V/V
= 2V/V
= 2V/V
= 2V/V
= 1V/V
= 1V/V
TV_CVBS_OUT
TV_R/C_OUT
TV_G_OUT
TV_FS_OUT
TV_B_OUT
TV_SS_OUT