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Conexant satellite demodulator operates from 0.5W

Posted: 20 Jan 2003 ?? ?Print Version ?Bookmark and Share

Keywords:conexant systems? cx24123? qpsk demodulator? fec decoder? cx24121?

Conexant Systems Inc. has introduced the single-stream CX24123 QPSK demodulator and FEC decoder that supports symbol rates from 1 megasymbols per second (Msps) to 45Msps and requires 0.5W of power to operate.

Available in 64-pin TQFP, the device is suitable for use in worldwide satellite STBs, PC receivers, personal video recorders, and residential gateway applications. The IC will also be offered in a 80-pin TQFP, which is pin-compatible with the company's previous CX24121 device.

The CX24123 takes an incoming analog signal from the tuner, converts it to a digital signal, checks it for any errors, and then outputs a digital data transport stream to an A/V decoder chip. When used in conjunction with the CX24109 satellite tuner, it forms a complete satellite front-end system. The device is compliant with international DVB/DSS/DCII industry standards.

The IC is also DiSEcC 2.x compliant, which enables two-way communication between the STB and peripheral satellite equipment, providing operators with equipment monitoring and diagnostic capabilities. Additional diagnostic features include an integrated SNR and bit error rate monitors.

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