NXP Semiconductors SAA7129H/V1,557

Overview

SAA7129H/V1,557 from NXP Semiconductors (formerly Philips Semiconductors) is a monolithic 3.3 V CMOS digital video encoder IC that converts ITU-R BT.656-compliant 4:2:2 CR-Y-CB data into analog NTSC/PAL/SECAM CVBS, S-video, and RGB outputs. It features dual 54 MHz multiplexed D1 input ports, three 10-bit DACs for CVBS/VBS/C signals, three 9-bit DACs for RGB, and integrated sync/clock generation. It is used in set-top boxes, DVD players, and broadcast equipment requiring multi-standard analog video output.

For engineers reviewing the SAA7129H/V1,557 datasheet, SAA7129H/V1,557 pinout, SAA7129H/V1,557 application, or SAA7129H/V1,557 equivalent, key selection considerations include its 13.5 MHz system pixel clock, QFP44 package with verified 44-pin analog/digital I/O mapping, support for WST/NABTS teletext and CGMS-A encoding, and programmable fader for overlay blending between two independent video streams.

Technical Context

The SAA7129H/V1,557 implements a dual-path architecture: one path encodes CR-Y-CB to composite/S-video using 10-bit DACs with subcarrier synthesis and burst insertion; the other path processes interpolated CR-Y-CB or bypasses to RGB via 9-bit DACs with YUV-to-RGB dematrixing. It supports interlaced and non-interlaced operation across NTSC-M, PAL-B/G, and SECAM standards.

Its synchronization engine operates in master or slave mode, accepting timing from RCV1/RCV2 pins or embedded BT.656 SAV/EAV codes. The on-chip crystal oscillator accepts fundamental or 3rd-harmonic crystals, and the I²C-bus interface runs at 400 kHz with selectable 88h/8Ch slave addresses via SA pin.

Key Specifications

Pinout & Package

Package: QFP44 (SOT307-2), plastic quad flat package, 10 × 10 × 1.75 mm body, 1.3 mm lead length.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital video encoder applications.

Compared with SAA7129H/V1,557, ADV7170KSTZ offers simpler I²C control but omits SECAM and teletext, while SAA7121HL/V1,557 reduces cost and complexity at the expense of fader functionality, CGMS-A, and 10-bit DAC precision.

Availability

SAA7129H/V1,557 is available at Aetrix Electronics and suitable for set-top box video output, DVD player analog encoding, broadcast teletext insertion, and professional video recorder interface applications requiring stable component supply and long-term industrial availability.

Supply support for SAA7129H/V1,557 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.

The SAA7129H/V1,557 belongs to NXP's legacy video processing product line, designed specifically for high-fidelity analog video encoding in broadcast- and consumer-grade equipment requiring multi-standard compatibility and embedded data services.

FAQ

What video standards does the SAA7129H/V1,557 support?

The SAA7129H/V1,557 supports NTSC-M, PAL-B/G, and SECAM standards with full compliance to RS170A and ITU-R BT.470-3 signal specifications. It handles both interlaced and non-interlaced operation and includes standard-specific burst insertion, chrominance pre-emphasis (for SECAM), and programmable subcarrier phase control - all implemented within the SAA7129H/V1,557 silicon without external components.

Does the SAA7129H/V1,557 include an on-chip oscillator?

Yes, the SAA7129H/V1,557 integrates a crystal oscillator supporting both fundamental and 3rd-harmonic crystals via XTALI/XTALO pins. When enabled, it eliminates the need for an external clock source and provides XCLK output for system timing distribution. This oscillator is part of the SAA7129H/V1,557's self-contained architecture and is fully functional across its 0–70 °C operating range.

How does the fader function work in the SAA7129H/V1,557?

The SAA7129H/V1,557 implements a 24-bit YUV color-keyed fader with three independent fade factors (FADE1–FADE3), each adjustable across 63 steps. It blends two video streams - one from MP7–MP0 and another from the video port - based on programmable upper/lower thresholds (KEY1L/KEY1U, etc.). This capability is built into the SAA7129H/V1,557 and enables smooth OSD overlay transitions without external logic.

Can the SAA7129H/V1,557 encode teletext and closed caption data?

Yes, the SAA7129H/V1,557 natively encodes World Standard Teletext (WST) and North-American Broadcast Text System (NABTS) on line 23, and closed caption/extended data service on line 21. It accepts serial bitstreams via TTX pin and generates precise TTXRQ timing requests. This teletext and caption functionality is implemented in hardware within the SAA7129H/V1,557 and requires no external processor or memory.

What is the difference between SAA7129H/V1,557 and SAA7128H?

The SAA7129H/V1,557 excludes Macrovision® Pay-per-View copy protection (rev. 6.1/7.01), which is present only in the SAA7128H. All other features - including NTSC/PAL/SECAM encoding, 10-bit/9-bit DACs, fader, teletext, CGMS-A, and pinout - are identical between the two parts. The SAA7129H/V1,557 is the non-Macrovision variant intended for applications where anti-taping is not required.