ST STV6419 User Manual

STV6419

Low-cost audio/video switch and 4-channel SD video filter

Features

■I2C bus control

■Interrupt signal output

■Video section:

–Three CVBS inputs; two CVBS outputs

–Two RGB or YPrPb or chroma / one FB input; one RGB or YPrPb or chroma / one FB output

–7-MHz low-pass filters on four encoder inputs

Data brief

LQFP48 7 × 7 × 1.4 mm3

(48-pin low-profile quad flat pack)

–Gain of 6 dB on all RGB and CVBS outputs

–Integrated 150-Ω buffers

–Capabilities of integrated output buffers:

–CVBS_TV can drive two standard 150-Ω video loads

–CVBS_VCR can drive one standard

150-Ω video load and one 600-Ω modulator load

– RGB can drive a standard 150-Ω video load

–ACor DC-coupled video outputs

–Two slow blanking inputs/outputs

–Selectable gain on one stereo input

–Audio muting on the output

–Audio outputs drive 3.1 V RMS into 2 kΩ

–Full-range volume control with soft control

–Audio BSkyB compatible

Applications

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

■Integrated digital TV plug-in

■Blu-ray and DVD players

–Bottom clamp on all CVBS and bottom/average/synchronized clamp on RGB inputs

–AC-coupled inputs for all video signal

–Crosstalk: 50 dB minimum

■Audio section:

–Three inputs; two outputs

–Stereo sound capability

–One mono sound output

–Differential or single-ended audio encoder input

Description

The STV6419 is a highly integrated I2C buscontrolled audio and video switch matrix, optimized for use in digital set-top box or DVD recorder applications. It provides the audio and video routings (CVBS and RGB) required in a non-full two SCART set-top box design.

The STV6419 is a fully integrated solution for filtering and buffering SD signals.

Table 1.	Device summary
Order code		Temperature range	Package	Packaging
STV6419AG		0 to 70 °C	LQFP48 (7 × 7 mm2)	Tray
STV6419AGT		0 to 70 °C	LQFP48 (7 × 7 mm2)	Tape and reel
October 2011		Doc ID 014825 Rev 1		1/4
For further information contact your local STMicroelectronics sales office.				www.st.com

Introduction	STV6419

1 Introduction

The STV6419 is an I2C-controlled integrated circuit for switching, filtering and buffering audio and video signals in any dual, non-full SCART application. It can be used in products such as SD and HD set-top boxes or DVD/BD players and recorders for European markets.

It can be connected to four video DAC outputs of an MPEG decoder, allowing simultaneous switching and driving of the composite and RGB signals, or the S-video signal only, to the TV SCART output, as well as the composite signal to the VCR SCART output. Further, the device provides the switching of the composite and RGB signals, or the S-video signals only, from the VCR SCART to the TV SCART.

The STV6419 manages the slow blanking and fast blanking signalling through the I2C bus.

The STV6419 provides the minimum required set of features to support the dual-SCART connector with significant cost reduction over existing solutions (such as STV6417 or competition) and in line with a price-sensitive, soon-to-be-phased-out legacy topology, for which set-top box manufacturers are no longer willing to pay a premium.

The STV6419 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 SD component output).

Features		Benefits

DC-coupled video inputs.

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

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 STV6417AH.

Pin-compatibility with STV6418AH.

Reduces component count.

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

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.

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

2/4	Doc ID 014825 Rev 1