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TDA8822 Datasheet(PDF) 2 Page - NXP Semiconductors |
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TDA8822 Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 28 page 1997 Jan 08 2 Philips Semiconductors Preliminary specification Universal I2C-bus programmable RF modulator TDA8822 FEATURES • 5 V power supply • Video amplifier with clamp and white clip circuits • Programmable video modulation depth • FM sound modulator (4.5, 5.5, 6.0 and 6.5 MHz) • Programmable picture-to-sound ratio • Programmable deviation of the sound subcarrier • Input for modulated NICAM sound subcarrier or second frequency modulated sound subcarrier • Asymmetrical or symmetrical RF output buffer • Symmetrical RF oscillator for UHF or VHF band according to the application • One I2C-bus programmable output port • On-chip Phase-Locked Loop (PLL) frequency synthesizer for the RF carrier • On-chip PLL frequency synthesizer for the sound carrier • On-chip power supply regulator • On-chip I2C-bus and/or hardware controlled Test Pattern Signal Generator (TPSG) with LED driver • RF output switch-off during tuning. APPLICATIONS • Video recorders • Cable converters • Satellite receivers • Set top boxes. GENERAL DESCRIPTION The TDA8822 is a programmable modulator which generates an RF TV channel from a baseband video signal and a baseband audio signal in the event of negative video and FM sound standards (B/G, I, D/K, M and N standards). Two PLL frequency-synthesizers set the picture carrier frequency and the sound subcarrier frequency to the required frequencies. These PLL frequency-synthesizers are programmed via the I2C-bus. The I2C-bus controls these features: • Video modulation depth • Sound subcarrier modulation deviation • Picture-to-sound ratio. This makes the IC suitable for multistandard applications without any adjustment into the application. Additional features are provided like an input for the NICAM or second FM carrier, a test pattern signal generator with a LED driver and a general purpose output port. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TDA8822T SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1 TDA8822M SSOP24 plastic shrink small outline package; 24 leads; body width 5.3 mm SOT340-1 |
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