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Audio/video buffer for single SCART and HD output
Features
2
■ I
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 3 V 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
Table 1. Device summary
STV6437B
Data brief
(48-pin thin quad flat pack with exposed pad down)
Applications
■ Set-top boxes (IP, cable, satellite, terrestrial)
■ Integrated digital TV plug-in
■ Blu-ray and DVD players
Description
The STV6437B is a fully integrated solution for
filtering and buffering standard- and highdefinition 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.
TQFP48 EPD 7 × 7 × 1 mm3
Order code Temperature range Package Packaging
2
STV6437BH 0 to 70 °C TQFP48 (7 × 7 mm
STV6437BHT 0 to 70 °C TQFP48 (7 × 7 mm
August 2011 Doc ID 019005 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
) EPD Tray
2
) EPD Tape and reel
www.st.com
4
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Introduction STV6437B
1 Introduction
The 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).
Features Benefits
Integrated switch from RGB/composite SCART
to S-video SCART.
Three selectable SD/HD filters and six
independently-mutable RGB and component
output buffers.
DC-coupled video inputs. Reduces component count.
AC- and DC-coupled high-drive capability video
outputs (for 70-Ω (minimum) loads).
Fixed-gain video buffers selectable as 6dB or
12 dB.
Smart pop-noise manager. Allows silent swap between active and standby
Selective standby command for audio or each
individual video output.
8-step selectable audio gain up to +28 dB,
supporting output of 3.1 V RMS (mi nimum).
Pin-compatibility with four other products. Combines single-device space-saving (up to 50%)
Avoids change of output configuration for video
DACs.
Allows suppression of either SD/HD component
output or SD SCART output when both are
connected to the TV.
Connects to any type of display and drives several
composite and RF modulator outputs without
external active components.
Makes the device future-proof for next generation
of SoC, with ever-finer technology and lower video
DAC supplies.
modes.
As low as 1-mW standby consumption supporting
compliance to 0.5-W standby requirements.
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.
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.
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STV6437B Revision history
Figure 1. Pin-compatible devices
Analog
audio/video
outputs
Set-top box
market segments
High-end
HD
Mid-range
Low-end
High-end
SD
Mid-range
Low-end
PbPr Y
LRCVBSLRCVBS LRCVBS
STV6418AH
STV6417AG
STV6430AGSTV6419AG
Pin-compatible ICs
LQFP-48 / TQFP-48 exposed pad
PbPr Y
LRCVBS
STV6437BH
PbPr Y
LR CVBS CVBS
STV6440AJ
STV6437AJ
STV6432AJ
Pin-compatible ICs
QFN25 5x5
S-Video
LR
2 Revision history
Table 2. Document revision history
Date Revision Changes
04-Aug-2011 1 Initial release.
Doc ID 019005 Rev 1 3/4
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STV6437B
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