TDA8261TW

INTEGRATED CIRCUITS DATA SHEET TDA8261TW Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer Product specification Supersedes data of 2004 Oct 25 2004 Dec 02 Philips Semiconductors Product specification Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer 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) Five frequency steps from 125 kHz to 2 MHz Crystal frequency output to drive demodulator IC Compatible with 5, 3.3 and 2.5 V I2C-bus Fully compatible and easy to interface with digital satellite demodulators of the Philips Semiconductors family 5 V DC supply voltage 32-pin high heat-dissipation package. APPLICATIONS Direct Broadcasting Satellite (DBS) QPSK demodulation Digital Video Broadcasting (DVB) QPSK demodulation BS digital 8PSK demodulation. GENERAL 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 MH...