STV6433 Datasheet, PDF (1/10 Pages) STMicroelectronics – Filtered Video Buffers for STB and DVD Devices

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STV6433
Filtered Video Buffers for STB and DVD Devices
FEATURES
s Y, C Inputs with 7.1 MHz filters
s 40 dB Stop Band Attenuation at 27 MHz
s RF Signal with 14 dB Notch Filter at 4.5 MHz
for Sound Trap
s RF Signal with -170 ns Differential Group
Delay between 400 kHz and 3.58 MHz
s 6 dB Gain
s Capabilities of Integrated Output Buffers:
Double-adapted Loads (75Ω) on CVBS
Output, Single-adapted Loads on Y and C
Outputs
s AC-coupled Inputs
s DC-coupled Outputs for Y, CVBS and RFOUT
s DC- or AC-coupled Output for COUT
s Bottom Clamp on Y, Bias Clamp on C
s Crosstalk: 55 dB (typical)
TARGET SPECIFICATION
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
1/10
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.