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STV6437
Audio/video buffer and four-channel SD/PS/HD video filter
Data briefAugust 2011 Doc ID 019028 Rev 1 1/4
STV6437Audio/video buffer and four-channel SD/PS/HD video filter
FeaturesI2 C bus control Video section: Selectable 7-MHz/15-MHz/30-MHz, low-
pass filters, plus bypass, on three encoder
video inputs 7-MHz, low-pass filter on one encoder
video input DC-coupled inputs Each output is capable of driving an AC- or
DC-coupled, 150-Ω video load at 3V pp
and CVBS output can drive a dual, 75-Ω
video load Fixed gain of 6 dB for each channel Selective video output muting of HD and
SD channels Audio section: Stereo sound capability Differential or single-ended audio inputs Audio outputs drive 2-kΩ loads at 3 V RMS Selectable audio gain of 0 to 28 dB Audio output muting 9 V to 12 V single supply operation Pop-noise suppression management Low power mode Audio/video standby function
Applications Set-top boxes (IP, cable, satellite, terrestrial) Integrated digital TV plug-in Blu-ray and DVD players
DescriptionThe STV6437 is a fully integrated solution for
filtering and buffering standard-definition,
progressive-scan and high-definition signals, and
buffering stereo audio signals from the MPEG
decoder of a digital receiver, Blu-ray or DVD
player, or iDTV plug-in.
The STV6437 embeds four buffers with low-pass
filters, three for HD (selectable 7/15/30 MHz) and
one for SD (7 MHz), and a dual audio amplifier
that operates with either differential or single-
ended inputs.
Table 1. Device summary
Introduction STV64372/4 Doc ID 019028 Rev 1
1 IntroductionThe STV6437 is an I²C-controlled integrated circuit for filtering and buffering audio and
video signals in any consumer electronics application with HD component and SD analog
outputs. It can be used in products such as HD set-top boxes or DVD/BD players and
recorders.
The STV6437 has a high level of integration and requires only the usual passive
components for decoupling and termination. The tiny package VFQFPN-28 ensures a small
footprint.
The STV6437 is one of the family of three, pin-compatible products (Figure 1) that complete
the new generation of audio and video switches and buffers from STMicroelectronics.
Together they cover, both technically and price-wise, the whole market spectrum from
mid-range SD retail (zapper set-top boxes or basic recorders) up to DVR HD operators
(set-top boxes or recorders with HD component output).
DC-coupled video inputs. Reduces component count.
AC- and DC-coupled high-drive capability video
outputs (for 70-Ω (minimum) loads).
Connects to any type of display and drives several
composite and RF modulator outputs without
external active components.
Smart pop-noise manager. Allows silent swap between active and standby
modes.
Selective standby command for audio and each
set of SD or HD video outputs.
As low as 4-mW standby consumption supporting
compliance to 0.5-W standby requirements.
8-step selectable audio gain up to +28 dB,
supporting output of 3.1 V RMS (minimum).
Easy fine-tune of THD and SNR depending on
requirements, whilst matching any specific audio
output level, including China Cable, and saving
external op-amps.
Pin-compatibility with two other products. Combines single-device space-saving (up to 50%)
benefits with commodity price/flexibility benefits to
allow a single PCB design covering the entire
market spectrum.
Pin-compatibility with STV6440AJ. Provides dual-source solution at no cost premium
in case of market shortage or sudden rise in
demand.
STV6437 Revision historyDoc ID 019028 Rev 1 3/4
2 Revision history
Table 2. Document revision history
STV64374/4 Doc ID 019028 Rev 1
This datasheet has been :
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Datasheets for electronic components.
