Vizio VX42L HDTV10A Service Manual page 46

3. FEATURES
1. Compliant with ATSC digital television standard
2. Supports SCTE DVS-031 and ITU J.83 Annex B digital CATV standard
3. Accepts direct IF (44 MHz or 43.75MHz) and low IF (5.38MHz)
4. Differential IF input with programmable input signal level: 0.5Vpp to 2Vpp
5. NTSC interference rejection capability
6. Compensate echo up to -35 to +60us range for terrestrial HDTV reception
7. Pass all Brazil fading channel ensembles
8. Meet all ATSC/A74 requirements.
9. On-chip programmable gain amplifier
10. 25MHz crystal for clock generation
11. Excellent adjacent and co-channel rejection capability, only single SAW is
required
12. Full-digital timing recovery, no VCXO is required
13. Full-digital frequency offset recovery with wide acquisition range ±1MHz for ATSC
and ±250kHz for CATV reception
14. Dual digital AGC controls for IF and RF respectively
15. MPEG-2 transport stream output in parallel or serial format
16. On-chip error rate estimators for TS packets, TCM decoder, and equalizer
17. EIA/CEA-909 antenna interface, both mode A and mode B are supported
18. Controlled by I2C interface
19. Supports sleep mode to save power consumption
20. Core power supply: 1.8V, peripheral power supply: 3.3V
21. 100-TQFP with lead free package
MT8291
The MediaTek MT8291 is a highly integrated stereo audio CODEC. The MT8291
performs stereo analog-to-digital and two digital-to-analog conversions with
single-ended analog voltage input and output. It's up to 24-bit serial values at sample
rates up to 192 kHz. A 7:1 stereo input multiplexer and an automatic level control are
included. The PGA is available for line inputs and provides gain/attenuation of 21dB in
0.5 steps.
Two DAC outputs reach 2Vrms in a 12V supply environment including a headphone,
two left/right line outputs with volume gain/attenuation from -127 dB to +12 dB and
digital de-emphasis function. Sampled data is transmitted through the serial audio
interface at various rates from 32 kHz to 192 kHz. For audio clock applications, the
MT8291 supports master, slave modes and three data formats in the serial interface.
Two individual sets of I2S ports including three clocks and digital data for each
simultaneously support different sample rates for the ADC and DACs and then output
from DAC1 and DAC2 independently.
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