Introduction to the HDM8515
The HDM8515 digital demodulator for direct broadcast satellite receivers is a single chip solution fully compliant with the European Telecommunications Standards Institute (ETSI) specification ETS 300 421. This chip integrates an A/D converter, a variable rate matched filter, a variable rate QPSK demodulator with a Viterbi decoder, a deinterleaver and a Reed Solomon decoder.

 Features and Benefits
* Fully DVB&DSS compliant
* Dual 6bit A/D converters
* Continuously variable symbol rate from 1Msps to 66Msps (90MHz clock)
* Internal digital root raised cosine filter
* Less than 0.5 dB implementation loss
* Frequency multiplexing capability
* Automated frequency search
* Internal bias cancellation
* Both wideband and narrowband AGC
* Noise calibration for antenna steering
* Output data rate as high as 82Mbps
* Fixed frequency sampling clock
* Simple interface with tuner and analog processing
* Microcontroller interface
* Eight bit parallel or I2C monitor and control interface
* I2C by-pass mode
* DiSeqC 1.2 interface support
* Dual Carrier Loop Filter