STV6437 Audio/video buffer and four-channel SD/PS/HD video filter Data brief Features ■ I2C bus control ■ Video section: – Selectable 7-MHz/15-MHz/30-MHz, lowpass 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 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. Low power mode – Audio/video standby function Table 1. VFQFPN-28 EPD 5× 5 × 1 mm3 (28-pin very fine quad flat pack with exposed pad Device summary Order code Temperature range Package Packaging STV6437AJ 0 to 70 °C VFQFPN-28 (5 × 5 mm2) EPD Tray STV6437AJT 0 to 70 °C VFQFPN-28 (5 × 5 mm2) EPD Tape and reel August 2011 Doc ID 019028 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Introduction 1 STV6437 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). 2/4 Features Benefits 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. Smart pop-noise manager. Allows silent swap between active and standby modes. Selective standby command for audio and each set of SD or HD video outputs. As low as 4-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 two 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 STV6440AJ. Provides dual-source solution at no cost premium in case of market shortage or sudden rise in demand. Doc ID 019028 Rev 1 STV6437 Revision history Figure 1. Pin-compatible devices Pr Pb Y Analog audio/video outputs Pr Pb Y Pr Pb Y S-Video Set-top box market segments R L CVBS R L CVBS R L CVBS R L CVBS R L CVBS R L CVBS High-end STV6418AH STV6440AJ STV6437BH HD Mid-range STV6417AG STV6437AJ Low-end STV6419AG STV6430AG High-end STV6432AJ SD Mid-range Low-end Pin-compatible ICs LQFP-48 / TQFP-48 exposed pad 2 Pin-compatible ICs QFN25 5x5 Revision history Table 2. Document revision history Date Revision 12-Aug-2011 1 Changes Initial release. Doc ID 019028 Rev 1 3/4 STV6437 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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