CXD1958Q中文資料索尼數(shù)據(jù)手冊PDF規(guī)格書

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.

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 offset compensation with negligible losses @ 5Mbaud 6MHz channel

? Symbol timing loop designed to acquire with large offsets. Negligible losses for ±100ppm offsets

? All internal clocks derived from single fixed frequency crystal (30MHz)

? Supports fast re-acquisition mode

? 6μs echo cancellation @ 5Mbaud

? Constellation points and equalizer tap values readable via I2C bus

? C/N estimation readable via I2C bus

? Low implementation loss for AWGN only: 0.5dB @ 64QAM (using internal 8-bit A/D); 0.3dB @ 256QAM (excluding A/D); measured at BER of 3x10–4 Pre R/S

? I = 12 and I = 204 de-interleaving

? Fast I2C bus compatible control interface

? Tuner IF-AGC output

? User programmable tuner RF-AGC output

? Dedicated 3-wire bus interface to configure up to 2 tuner synthesizers

? 3.3V CMOS technology

? Supports JTAG boundary scan

? 100-pin QFP package

Applications

MMDS set-top boxes