廬
STV6433
Filtered Video Buffers for STB and DVD Devices
TARGET SPECIFICATION
FEATURES
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Y, C Inputs with 7.1 MHz filters
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40 dB Stop Band Attenuation at 27 MHz
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RF Signal with 14 dB Notch Filter at 4.5 MHz
for Sound Trap
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RF Signal with -170 ns Differential Group
Delay between 400 kHz and 3.58 MHz
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6 dB Gain
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Capabilities of Integrated Output Buffers:
Double-adapted Loads (75鈩? on CVBS
Output, Single-adapted Loads on Y and C
Outputs
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AC-coupled Inputs
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DC-coupled Outputs for Y, CVBS and RFOUT
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DC- or AC-coupled Output for COUT
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Bottom Clamp on Y, Bias Clamp on C
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Crosstalk: 55 dB (typical)
SO8
Order Code:
STV6433
DESCRIPTION
The STV6433 is a filtered video output interface for DVD, Satellite and Cable Set-Top Box applications.
After removing D/A conversion noise using integrated low pass filters, the STV6433 adapts the Y and C
signals coming from the digital decoder in amplitude and impedance for transmission to the TV set and an
auxiliary device (VCR, DVD recorders, etc.) via adapted 75-ohm cables.
A Y+C adder with buffer for providing a CVBS signal to external loads and a pre-processing of a CVBS
signal for RF modulator (RFOUT) are included in STV6433.
This pre-processing is a notch filtering at 4.5 MHz (before the addition of the audio signal in the RF
modulator) and a 170 ns Y/C delay (to compensate the nominal distorsion in the TV IF filter).
The STV6433 is powered by a 5V voltage supply and is fully-compatible with STi55xx digital encoders.
September 2003
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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