TDA8042M

INTEGRATED CIRCUITS DATA SHEET TDA8042M Quadrature demodulator Product specification File under Integrated Circuits, IC02 1997 Apr 11 Philips Semiconductors Product specification Quadrature demodulator FEATURES 5 V supply voltage Internal voltage reference 350 to 650 MHz input frequency range On-chip 0° and 90° phase shifter Symbol rate up to 45 Msymbols/s High input sensitivity Built-in voltage stabilizer AGC amplifier with 21 dB control range AGC detector. APPLICATION Binary Phase-Shift Keying (BPSK) and Quadrature Phase-Shift Keying (QPSK) demodulation. GENERAL DESCRIPTION TDA8042M The TDA8042M is a monolitic bipolar IC dedicated for BPSK and QPSK demodulation. It is designed to be used together with the TDA8043 as part of a complete BPSK/QPSK satellite demodulator and decoder. The bandwidth of the TDA8042M allows symbol rates up to 45 Msymbols/s. It includes two matched mixers, an IF gain controlled amplifier, a symmetrical oscillator, a 0°/90° phase shifter, two low-pass filters and two matched baseband amplifiers. The high input sensitivity makes interfacing with various sources easy. The input sensitivity can be adjusted by means of an internal AGC amplifier. The oscillator operates at half the IF frequency. The local oscillator signal driving the mixers is made by doubling the oscillator frequency by an internal frequency multiplier. The oscillator frequency can be set by the appropriate external LC tank circuit. The internal wideband phase sh...