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DESCRIPTION

Designed for World Space satellites digital audio receivers, the STA002 Digital Receiver Front-end integrates all the blocks needed to demodulate incoming digital satellite audio signals from the tuner: analog to digital converter, QPSK demodulator, signal power estimator, automatic gain control, Viterbi decoder, deinterleaver, Reed-Solomon decoder and energy dispersal descrabler. Its advanced error correction functions guarantees a low error rate even with small low gain receiver antennas.

FRONT_END INTERFACE:

■ IF input carrier frequency: f = 1.84 MHz

■ Single internal 6 bit A/D converter

■ QPSK demodulation

■ Input symbol frequency: Fs = 1.84 Msymbols/s

■ Digital Nyquist root filter:

- roll-off value of 0.4

■ Digital carrier loop:

- on-chip quadrature demodulator and tracking loop

- lock detector

- C/N indicator

■ Digital timing recovery:

- internal timing error evaluation, filter and correction

■ Digital AGC:

- internal signal power estimation and filter

- output control signal for AGC (1 bit PWM)

BACK_END INTERFACE:

■ Broadcast Channel selection

■ Audio Service Component selection to MPEG decoder

■ Service Component selection

CONTROL:

■ I2C serial Bus control interface

DECRYPTION:

■ WES scheme supported