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TDA10021HT データシート(PDF) 2 Page - NXP Semiconductors

部品番号 TDA10021HT
部品情報  DVB-C channel receiver
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA10021HT データシート(HTML) 2 Page - NXP Semiconductors

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2001 Oct 01
2
Philips Semiconductors
Product specification
DVB-C channel receiver
TDA10021HT
FEATURES
• 4, 16, 32, 64, 128 and 256 Quadrature Amplitude
Modulation (QAM) demodulator (DVB-C compatible:
ETS 300-429/ITU-T J83 annex A/C)
• High performance for 256 QAM, especially for direct
IF applications
• On-chip 10-bit Analog-to-Digital Converter (ADC)
• On-chip Phase-Locked Loop (PLL) for crystal frequency
multiplication (typically 4 MHz crystal)
• Digital downconversion
• Programmable half Nyquist filter (roll off = 0.15 or 0.13)
• Two Pulse Width Modulated (PWM) AGC outputs with
programmable take over point (for tuner and
downconverter control)
• Clock timing recovery, with programmable 2nd-order
loop filter
• Variable symbol rate capability from SACLK/64 to
SACLK/4 (SACLK = 36 MHz maximum)
• Programmable anti-aliasing filters
• Full digital carrier recovery loop
• Carrier acquisition range up to 18% of symbol rate
• Integrated adaptive equalizer (linear transversal
equalizer or decision feedback equalizer)
• On-chip Forward Error Correction (FEC) decoder
(de-interleaver and RS decoder) and fully DVB-C
compliant
• DVB compatible differential decoding and mapping
• Parallel and serial transport stream interface
simultaneously
• I2C-bus interface, for easy control
• CMOS 0.2 µm technology.
APPLICATIONS
• Cable set-top boxes
• Cable modems
• MMDS (ETS 300-749) set-top boxes.
GENERAL DESCRIPTION
The TDA10021HT is a single-chip DVB-C channel
receiver for 4, 16, 32, 64, 128 and 256 QAM modulated
signals. The device interfaces directly to the IF signal,
which is sampled by a 10-bit ADC.
The TDA10021HT performs the clock and the carrier
recovery functions. The digital loop filters for both clock
and carrier recovery are programmable in order to
optimize their characteristics according to the current
application.
After baseband conversion, equalization filters are used
for echo cancellation in cable applications. These filters
are configured as either a T-spaced transversal equalizer
or a Decision Feedback Equalizer (DFE), so that the
system performance can be optimized according to the
network characteristics. A proprietary equalization
algorithm, independent of carrier offset, is achieved in
order to assist carrier recovery. A decision directed
algorithm then takes place, to achieve final equalization
convergence.
The TDA10021HT implements a FORNEY convolutional
de-interleaver of depth 12 blocks and a Reed-Solomon
decoder which corrects up to 8 erroneous bytes. The
de-interleaver and the RS decoder are automatically
synchronized by the frame synchronization algorithm
which uses the MPEG-2 sync byte. Finally descrambling
according to DVB-C standard, is achieved at the Reed
Solomon output. This device is controlled via an I2C-bus.
Designed in 0.2
µm CMOS technology and housed in a
64 pin TQFP package, the TDA10021HT operates over
the commercial temperature range.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA10021HT
TQFP64
plastic thin quad flat package; 64 leads; body 10
× 10 × 1.0 mm
SOT357-1


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