Description

The CXD2027Q/R are audio signal processors designed for DBS applications. These LSIs perform all digital processing from QPSK demodulation to analog audio output on a single chip.

Features

QPSK and PCM demodulators and DAC output are configured on a single chip.

Descrambler interface according to the COATEC system and SkyPort system .

Functions

QPSK demodulator

• Carrier, clock and data regeneration

• ALC and VCXO adjustment-free

PCM demodulator

• Frame sync protection by correlation detection

• De-interleaving and descrambling

• BCH error correction, range bit error correction

• Audio data range control

Expansion from 10 to 14 bits in A mode

Upper bit majority correction in B mode

• Control sign integration correction, chargeable flag integration correction by master frame synchronization

• Interface output for external DAC

• Digital interface output

1-bit DAC output

• Quadruple oversampling filter

• Digital de-emphasis circuit

• 1-bit stereo DAC with 2nd-order ∆∑ format noise shaper

S/N ratio : 90dB (Typ.)

Distortion : 0.011 (Typ.)

CPU interface

• I2C bus

Descrambler interface

• COATEC system, SkyPort system

Mute functions

• Error occurrence frequency detection mute

• Audio chargeable flag detection mute

• Control sign (B7) detection mute