TDA8261TW Description
The direct conversion QPSK demodulator is the front-end receiver dedicated to digital TV broadcasting, satisfying both DVB and DBS TV standards. The wide range oscillator (from 950 to 2175 MHz) covers the American, European and Asian satellite bands, as well as the Satellite Master Antennae (SMA) TV US standard. The Zero-IF concept discards traditional IF filtering and intermediate conversion techniques.
TDA8261TW Key Features
- Direct conversion Quadrature Phase Shift Keying (QPSK) and 8PSK demodulation (Zero-IF)
- 950 to 2175 MHz frequency range
- High-level asymmetrical RF input
- 0 to 50 dB variable gain on RF input
- Loop-controlled 0° to 90° phase shifter
- High AGC linearity (<1 dB per bit with an 8-bit DAC), AGC between 0 and 3 V
- External baseband filters for In-phase (I) and Quadrature (Q) signal paths
- I2C-bus controlled PLL frequency synthesizer
- Low phase noise
- Operation from a 4 MHz crystal (allowing the use of an SMD crystal)