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STV6437BH
Audio/video buffer for single SCART and HD output
Data briefAugust 2011 Doc ID 019005 Rev 1 1/4
STV6437BAudio/video buffer for single SCART and HD output
FeaturesI2 C bus control Video section: Selectable 7-MHz/30-MHz, low-pass filters,
plus bypass, on three encoder video inputs 7-MHz low-pass filters on six encoder video
inputs 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 Selectable gain of 6 or 12 dB for each
channel Selective video output muting 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 Click-noise suppression management 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 STV6437B is a fully integrated solution for
filtering and buffering standard- 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 STV6437B is an assortment of switches and
low-pass filters (three HD/SD filters and one SD
filter) with output buffers and a dual audio
amplifier that operates with either differential or
single-ended inputs.
Table 1. Device summary
Introduction STV6437B2/4 Doc ID 019005 Rev 1
1 IntroductionThe STV6437B is an I²C-controlled integrated circuit for filtering and buffering audio and
video signals in any single-SCART or non-SCART application with HD component output. It
can be used in products such as HD set-top boxes or DVD/BD players and recorders for
world-wide markets.
It can be connected to six video DAC outputs of an MPEG decoder, allowing simultaneous
switching and driving of either the composite and RGB signals, or S-video/composite
signals, to the TV SCART output, and the HD component output to RCA HD sockets. The
STV6437B manages the slow blanking and fast blanking signalling through the I²C bus.
The STV6437B is one of the family of five, 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).
Integrated switch from RGB/composite SCART
to S-video SCART.
Avoids change of output configuration for video
DACs.
Three selectable SD/HD filters and six
independently-mutable RGB and component
output buffers.
Allows suppression of either SD/HD component
output or SD SCART output when both are
connected to the TV.
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.
Fixed-gain video buffers selectable as 6 dB or dB.
Makes the device future-proof for next generation
of SoC, with ever-finer technology and lower video
DAC supplies.
Smart pop-noise manager. Allows silent swap between active and standby
modes.
Selective standby command for audio or each
individual video output.
As low as 1-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 four 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 STV6418AH. Provides dual-source solution at no cost premium
in case of market shortage or sudden rise in
demand.
STV6437B Revision historyDoc ID 019005 Rev 1 3/4
2 Revision history
Table 2. Document revision history
STV6437B4/4 Doc ID 019005 Rev 1
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
