PS20353 Datasheet, PDF (1/27 Pages) List of Unclassifed Manufacturers – Nordig Unified DVB-T COFDM Terrestrial Demodulator

PS20353
Nordig Unified DVB-T COFDM
Terrestrial Demodulator for
PC-TV and hand-held Digital TV (DTV)
Data Sheet
Features
• Compliant with ETSI 300 744 DVB-T, Nordig-
Unified 1.0.2 and DTG performance specifications.
• High performance with fast fully blind acquisition and
tracking capability.
• Low power consumption: less than 0.32 W,
and eco-friendly standby and sleep modes.
• Digital filtering of adjacent channels.
• Single 8 MHz SAW filter for 6, 7 & 8 MHz OFDM.
• Superior single frequency network performance.
• Fast AGC to track out signal fades.
• Good Doppler tracking capability.
• Enhanced frequency capture range to include
triple offsets.
• External 4 MHz clock or single low-cost 20.48
MHz crystal, tolerance up to +/-200 ppm.
• Automatic mode (2 K/8 K), guard and spectral
inversion detection.
• Very low driver software overhead due to on-
chip state-machine control.
• Novel RF level detect facility via a separate ADC.
• Pre and post Viterbi-decoder bit error rates,
and uncorrectable block count.
Applications
• Digital terrestrial set-top boxes
• Integrated digital televisions
• Personal video recorders
• PC-TV receivers
• Portable applications
Description
The PS20353 is a superior fourth generation fully
compliant ETSI ETS300 744 COFDM demodulator that
exceeds, with margin, the performance requirements of
all known DVB-T digital terrestrial television standards,
including Unified Nordig and DTG.
Data Sheet 292080 issue 1
Ordering Information
PS20353C1L1A5
64 Pin LQFP*
Trays
PS20353C1L1AT 64 Pin LQFP*
Tape and Reel
* Pb Free Matte Tin (RoHS compliant)
Working temperature range: -10°C to +80°C
A high performance 10 bit on-chip ADC is used to sample the
44 or 36 MHz IF analog signal. Advanced digital filtering of the
upper and lower channel enables a single 8 MHz channel SAW
filter to be used for 6, 7 and 8 MHz OFDM signal reception. All
sampling and other internal clocks are derived from a single
20.48 MHz crystal or a 4 MHz clock input, the tolerance of
which may be relaxed as much as 200 ppm.
The PS20353 has a wide frequency capture range able to
automatically compensate for the combined offset
introduced by the tuner xtal and broadcaster triple
frequency offsets.
An on-chip state machine controls all acquisition and
tracking operations of the PS20353 as well as controlling
the tuner via a 2-wire bus. Any frequency range can be
automatically scanned for digital TV channels. This
mechanism ensures minimal interaction, maximum
flexibility and fast acquisition - very low software
overhead.
Also included in the design is a 7-bit ADC to detect the
RF signal strength and thereby efficiently control the
tuner RF AGC.
Users have access to all the relevant signal quality
information, including input signal power level, signal-to-
noise ratio, pre-Viterbi BER, post-Viterbi BER, and the
uncorrectable block counts. The error rate monitoring
periods are programmable over a wide range.
The device is packaged in a 10 x 10 mm 64-pin LQFP
and is very low power.
Figure 1- Block Diagram
PLESSEY SEMICONDUCTORS LTD
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