This document describes the TDA 2140 monolithic integrated circuit used for regenerating and processing the subcarrier reference signals in PAL colour TV receivers. It includes the main features, absolute maximum ratings, mechanical dimensions, and a block diagram of the circuit.
Detailed pin‑by‑pin information, electrical characteristics, and application notes are provided, covering supply voltage, current consumption, output waveforms, colour‑killer operation, and the automatic phase‑control circuit.
| Supply current (pin 2) | 45 mA – 64 mA |
|---|---|
| Output voltage V1 (B‑Y) peak‑to‑peak | 0.9 Vpp |
Pin 9 is the colour‑killer output, which is activated when the antenna signal is too low or the oscillator is not locked.
The sandcastle pulse is taken from the flyback pulse applied at pin 15 and shaped by the RC network connected to pin 14.
The flyback pulse must be negative with a maximum amplitude of 55 Vpp.