ATSC demodulator for DTV systems  - TVP9900 - Texas Instruments

TI announced the TVP9900, an ATSC (VSB/QAM) demodulator for Digital TV (DTV) systems (ATSC = American Television Standards Committee). The demodulator is compatible with North American Digital TV broadcasts, including HDTV standard, and its performance fulfill the ATSC’s A/74 recommendations.

TI claim, the highly integrated TVP9900 VSB/QAM demodulator saves Digital TV production up to 20% of TV receiver’s BOM. The footprint of this demodulator is only 14×14 mm, saves board space up to 300 mm2 over alternative demodulation solutions.

Key features of TVP9900 VSB/QAM  demodulator:

• ATSC 8-VSB Demodulation and FEC
• ITU-J.83B Compliant 64/256 QAM Demodulation and FEC
• Direct 44-MHz IF Sampling Eliminates Need for External Downconverter
• Integrated IF PGA
• Integrated High-Speed 10-bit A/D Converter
• Integrated Digital Filter Relaxes External Tuner Filters
• Sigma-Delta DAC for AGC Control
• Adjacent Channel Filter
• NTSC Co-Channel Rejection Filter
• All Digital Timing Recovery
• Pilot Tracking Loop With Lock Status Indicator Signal
• Decision-Directed Carrier Phase Tracking Loop
• Field and Segment Synchronization With Sync Status Indicator Signal
• Host Interrupt for Remote Monitoring of Signal Quality
• SNR Monitor
• BER Monitor
• Integrated De-Interleaver RAM
• Parallel/Serial MPEG Output Interface With Error Packet Indicator
• Direct Tuner Control Interface
• EIA/CEA-909 Antenna Control Interface
• Option for 4-MHz Clock Input Driven by MOP IC in Tuner, So No Quartz Crystal Required for Demodulator
• External DAC and VCXO for Clock Recovery Not Required
• Equalizer Covers Echo Profile Required by ATSC A.74 Guideline
• Superior Multipath Performance Demodulating for Brazil Ensembles A Through E
• Power-Down Mode
• 80-Pin TQFP Package

The TVP9900 ATSC demodulator performance meets or exceeds the ATSC’s A/74 recommendations. This helps to simplify receiver design while ensuring high-quality imaging. It supports all typical Digital TV usage through ATSC 8-VSB demodulation for broadcast and ITU- J.83B 64/256 QAM demodulation for cable, including forward error correction. An MPEG-2 data stream output can be fed to a wide range of Digital TV video processors.

Key specs of TVP9900 VSB/QAM  demodulator:

• Input Format: Intermediate Frequency (IF)
• Input Standards: ATSC 8-VSB, ITU-J.83B 64/256-QAM
• Analog Inputs: one Differential or single ended 44MHz input
• ADC Resolution: 10 Bits
• Output Format: MPEG-II Transport Streams
• Output Standards: ISO/IEC 13818-1, parallel or serial
• Supply Voltage: 1.5 and 3.3 volts

The TVP9900 directly accepts the intermediate frequency signal (at 44-MHz, standard output from tuners). This capability eliminates the need of down converter circuitry. The TVP9900 ATSC demodulator has special feature to accept a 4-MHz clock input directly from the tuner, so it does not need extra crystal oscillator.  Integrated digital filtering is able to remove aliasing from adjacent channels. A high-speed 10-bit ADC with a 62.5-MHz option combines with adjacent channel filtering, reduce the necessary external saw filter and IF amplification components.

For development, TI offers the TVP9900 evaluation module (EVM), providing a ready to use ATSC front end receiver, complete with an interface to an Alps tuner daughter card. An MPEG-2 data stream output can be fed to the developer’s choice of back-end Digital TV processors. TI’s WinVCC (Windows Video Control Center) software provides an easy-to-use, comprehensive user interface for initialization, optimization and status reports, including a virtual oscilloscope for signal visualization. The price of TVP9900 evaluation module plus WinVCC software tool is $499.

The new TVP9900 VSB/QAM  demodulator is shipped in 14×14 mm 80-pin thin quad flatpack (TQFP). The price is $6.00 per unit in 1K lot qty.

Texas Instruments TVP9900 - VSB/QAM  demodulator for Digital TV systems