NXT2002 VSB/QAM Receiver - Overview

The NXT2002 Multimode VSB/QAM demodulator is configurable to work in either the ATSC compliant 8 VSB mode for terrestrial broadcasting or in the ITU-J.83B/SCTE DVS-031/ DOCSISTM compliant 64 QAM or 256 QAM modes for Digital TV-Cable Connect and Digital TV-Cable Interactive reception. The NXT2002 is designed for off air and cable digital television receiver, Set- Top, PCTV, and datacast applications where cost and industry leading performance is a must.

The NXT2002 is a highly integrated solution to DTV reception demonstrating superior performance in the presence of multipath, phase noise, impulse noise, adjacent and co-channel interference in terrestrial and cable environments. The NXT2002 handles 0dB echoes through a wide range of delays.

The sparsed equalizer provides better AWGN performance, exceptional dynamic multipath tracking, and less stochastic jitter than conventional equalizers. Advanced integrated adaptive control provides fast reliable acquisition and re-acquisition. These advancements in equalizer technology improve the overall demodulator performance resulting in reliable operation in environments where competing solutions may not acquire or maintain signal lock.

Features include automatic acquisition and reacquisition of the DTV signal. The NXT2002 is capable of reporting detailed statistical and signal quality information to the host processor. The RF Sense input together with the signal quality information enhance the end users‘ ease of operation. The improved AGC control allows separate programmable gain compensation between the RF and IF blocks optimizing the gain distribution. Six programmable ports are user configurable. The NXT2002 provides the tuner with a buffered interface configurable for I2C compatible, 3- or 4- wire control. The NXT2002 can be configured to operate from a 25 MHz crystal or from an external 25 MHz clock source. The on-chip integration of the ADC, AGC integrator, tuner control and the all-digital carrier recovery circuitry further reduces the cost of external components.