ST STV6437 User Manual

Audio/video buffer and four-channel SD/PS/HD video filter

Features

2

■ I

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 3 V 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

Table 1. Device summary

STV6437

Data brief

(28-pin very fine quad flat pack with exposed pad

Applications

■ Set-top boxes (IP, cable, satellite, terrestrial)

■ Integrated digital TV plug-in

■ Blu-ray and DVD players

Description

The 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 single­ended inputs.

VFQFPN-28 EPD 5× 5 × 1 mm3

Order code Temperature range Package Packaging

2

STV6437AJ 0 to 70 °C

STV6437AJT 0 to 70 °C

August 2011 Doc ID 019028 Rev 1 1/4

For further information contact your local STMicroelectronics sales office.

VFQFPN-28 (5 × 5 mm
EPD

VFQFPN-28 (5 × 5 mm
EPD

)

Tray

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)

Tape and reel

www.st.com

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Introduction STV6437

1 Introduction

The 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).

Features Benefits

DC-coupled video inputs. Reduces component count.
AC- and DC-coupled high-drive capability video

outputs (for 70-Ω (minimum) loads).

Smart pop-noise manager. Allows silent swap between active and standby

Selective standby command for audio and each
set of SD or HD video outputs.

8-step selectable audio gain up to +28 dB,
supporting output of 3.1 V RMS (mi nimum).

Pin-compatibility with two other products. Combines single-device space-saving (up to 50%)

Pin-compatibility with STV6440AJ. Provides dual-source solution at no cost premium

Connects to any type of display and drives several
composite and RF modulator outputs without
external active components.

modes.
As low as 4-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.

in case of market shortage or sudden rise in
demand.

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