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TDA8261TW - Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer

General Description

The direct conversion QPSK demodulator is the front-end receiver dedicated to digital TV broadcasting, satisfying both DVB and DBS TV standards.

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 (.

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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 o