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CONFIDENTIAL – DO NOT COPY
Page 8-22
File No. SG-0184
The carrier frequency offset and symbol timing offset are both estimated and compensated by a
fully digital synchronizer . The synchronizer also controls the rate conversion in the digital
re-sampling device by estimating the sampling frequency offset . All synchronization in MT5111
are integrated in digital circuits , no external VCXO is required.
The equalizer is adopted to cancel the effect of multi-path fading channel during signal
propagation in the air . The equalizer is not only capable of acquiring correct coefficients
combination by specified adaptive algorithms , but also programmable to different configurations
for various channel conditions.
The following FEC decoder corrects most of the errors by the concatenation of TCM and
Reed-Solomon decoders . The on-chip error rate estimator can simultaneously monitor the
receiving qualities at the three stages: equalizer output , TCM decoder , and transport stream
packets . The chip finally outputs the decoded MPEG-2 packets in either the serial or parallel
transport stream format.
In addition to the demodulation of HDTV signal , MT5111 also provides the capability to remove
the NTSC co-channel interference.To achieve the best reception condition , an antenna interface
compliant with EIA/CEA-909 is designed to control the antenna parameters.
MT5111 is designed with efficient mechanisms of power saving . When configured to enter the
sleep mode by the system host , it can immediately turn off almost all embedded hardware
except the on-chip controller to reduce the power consumption . Resuming form sleep mode is
also triggered by the system host . Upon returning to the operation mode , the chip will try to
re-acquire the DTV signal automatically.
MT5111 Key Features:
1. ATSC compliant 8-VSB demodulator
2. Accepts dirtect IF (44 MHZ or 43.75 MHZ) and low IF (5.38 MHZ)
3. Differential IF input with programmable input signal level : 0.5 Vpp to 2 Vpp
4. NTSC interference rejection capability
5. Compensate echo up to –5 to +47 us range
6. On-chip 10-bit ADC for HDTV demodulator
7. On-chip programmable gain amplifier