CXD1958Q

CXD1958Q MMDS TCM/QAM Demodulator + FEC + ADC Description The CXD1958Q is an integrated TCM/QAM demodulator for MMDS systems using the DAVIC MMDS standard. This highly integrated device incorporates an internal 8-bit ADC, image rejection and root-raised cosine filters, all-digital symbol timing recovery PLL, adaptive decision feedback equalizer (DFE) with 10 feedforward and 30 feedback taps, 4-D TCM decoder, and DAVIC/DVB compliant forward error correction comprising (204,188) Reed Solomon decoder, a programmable de-interleaver with I = 12 and I = 204, and a de-randomiser. All internal clocks are generated from a single external 30MHz reference crystal. Device functionality also includes 3-wire bus interface for configuring up to 2 tuner synthesizers, a sigma delta tuner IF-AGC output, a user programmable RFAFC sigma delta output, spectrum inversion of the received signal for tuner compatibility, and a highly configurable MPEG2-TS interface. An I2C bus interface provides on-board configuration and status monitoring of various functions including access to the equalizer tap values and constellation points. JTAG provides boundary scan test compatibility. Features DAVIC MMDS V1.1 and V1.3 compliant Supports 16, 64 and 256QAM Supports 16, 64 and 256 TCM Internal 8-bit ADC Interface for 10-bit external ADC 36.125MHz nominal IF input Symbol rate range 5 – 5.304Mbaud in 6MHz channels Integrated matched filtering with 0.15 roll-off factor ±400KHz internal carrier of...