ST STV6437B User Manual

STV6437B

Audio/video buffer for single SCART and HD output

Features

■I2C 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 ACor 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

Data brief

TQFP48 EPD 7 × 7 × 1 mm3

(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 standardand 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.

Table 1.	Device summary
Order code		Temperature range	Package	Packaging
STV6437BH		0 to 70 °C	TQFP48 (7 × 7 mm2) EPD	Tray
STV6437BHT		0 to 70 °C	TQFP48 (7 × 7 mm2) EPD	Tape and reel

August 2011	Doc ID 019005 Rev 1	1/4
For further information contact your local STMicroelectronics sales office.		www.st.com

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

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.

ACand DC-coupled high-drive capability video outputs (for 70-Ω (minimum) loads).

Fixed-gain video buffers selectable as 6 dB or 12 dB.

Smart pop-noise manager.

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 (minimum).

Pin-compatibility with four other products.

Pin-compatibility with STV6418AH.

Benefits

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.

Reduces component count.

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.

Allows silent swap between active and standby 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.

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.

Provides dual-source solution at no cost premium in case of market shortage or sudden rise in demand.

2/4	Doc ID 019005 Rev 1