TDA8822 is a programmable modulator that generates an RF TV channel from a baseband video signal and a baseband audio signal. It has various features, including a 5V power supply, a video amplifier with clamp and white clip circuits, programmable video modulation depth, FM sound modulator, programmable picture-to-sound ratio, etc.
The Philips TDA8822 is a programmable RF modulator designed to generate an RF TV channel from baseband video and audio signals. It supports negative video and FM sound standards including B/G, I, D/K, M, and N. The device features an on-chip Phase-Locked Loop (PLL) frequency synthesizer for both the RF and sound carriers, which are controlled via an I2C-bus interface.
| Analog supply voltage | 4.5 to 5.5 V |
|---|---|
| Digital supply voltage | 4.5 to 5.5 V |
| Total supply current | 60 to 72 mA |
| Sound subcarrier frequency range | 4.5 to 6.5 MHz |
| Sound subcarrier deviation range (B/G, I, D/K, M, N) | 10 to 22.5 kHz |
The available frequencies are 4.5 MHz, 5.5 MHz, 6.0 MHz, and 6.5 MHz.
The modulation depth can be adjusted from 72.5% to 90.0%.