This document describes the features and characteristics of the TDA4857PS I2C-bus autosync deflection controller for PC monitors, including full horizontal plus vertical autosync capability, extended horizontal frequency range, comprehensive set of I2C-bus driven geometry adjustments and functions, very good vertical linearity, moire cancellation, start-up and switch-off sequence for safe operation, X-ray protection, flexible switched mode B+ supply function block, internally stabilized voltage reference, drive signal for focus amplifier with vertical parabola waveforms, DC controllable inputs for Extremely High Tension (EHT) compensation, and SDIP32 package.
The TDA4857PS is a high‑performance I2C‑bus autosync deflection controller designed for PC monitors. It provides full horizontal and vertical autosync, extended frequency range, geometry adjustments, and protection features such as X‑ray protection and soft‑start.
The document includes a pin‑out table, electrical characteristics, functional descriptions of the frequency‑locked loop, horizontal oscillator, vertical sync integrator, and soft‑start/standby operation, as well as ordering and package information for the SDIP32 32‑lead package.
| Supply voltage (Vcc) | 9.2 V – 16 V |
|---|---|
| Supply current (standby) | 9 mA |
| Vertical size range | 60 % – 100 % |
| Ambient temperature range | -20 °C to +70 °C |
| Package | SDIP32, 32‑lead plastic shrink package |
The device operates from 9.2 V up to 16 V.
It is supplied in an SDIP32 package with 32 pins.
It can handle horizontal, vertical, composite and sync‑on‑video signals.