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ZL10210 반도체 회로 부품 판매점

DVB-C Cable Channel Demodulator



Zarlink Semiconductor 로고
Zarlink Semiconductor
ZL10210 데이터시트, 핀배열, 회로
ZL10210
DVB-C Cable Channel Demodulator
Data Sheet
Features
• DVB-C EN300429 and ITU-T J.83 annex A/C
compliant QAM demodulator
• Conventional IF and low IF input supported
• QAM constellations 16, 32, 64, 128 and 256
• Symbol rates up to 9 MBaud
• Blind acquisition of all symbol rates
• Blind acquisition of QAM constellations
www.DataSheet4US.cionmgle IF filter bandwidth for all symbol rates
• Signal level, BER and SNR indicators
• Programmable IF/RF AGC take-over point
• Power down mode under software control
• Parallel and serial MPEG outputs
• External 4 or 27 MHz clock or single low-cost
10 MHz crystal
• Small package size LQFP64 7x7 mm
• Power consumption <300 mW at 6.9 MBaud
• 5 V tolerant 2-wire bus control interface
• 5 V tolerant GPIO port and AGC outputs
• RF level detect facility via a separate ADC
• Very low driver software overhead due to on-chip
state-machine control.
• General purpose programmable timer
Applications
• Set-top boxes
• Digital cable ready TV applications
• Cable modems
• SMATV/MATV receivers
November 2005
Ordering Information
ZL10210/GC/GP1N 64 Pin LQFP
-40oC to +85oC
Description
The ZL10210 is a DVB-C and ITU-T annex A/C QAM
demodulator. This low power cable demodulator
includes standard Zarlink features of auto signal acqui-
sition, fast blind-scan capability, software/hardware
power down, RF level, BER and SNR detection. The
ZL10210 represents the latest in QAM demodulation
for DVB cable. Together with a cable tuner, a full digital
cable receiver front-end can be realized. Either
conventional intermediate frequencies such as 36 or
44 MHz or low intermediate frequencies can be used -
see application below. The ZL10210 requires only a
single channel filter bandwidth of 8 MHz nominal for full
DVB and ITU-T annex A/C performance. The low
power consumption, small package form factor and
integrated software/hardware power-down modes help
reduce the system BoM (bill of materials) in cost
sensitive applications. The device is packaged in a
7 x 7 mm 64-pin LQFP.
Functional Description
The ZL10210 accepts an analog signal from the tuner,
either at low Intermediate Frequency (IF) or conven-
tional IF up to 50 MHz, and delivers an MPEG2
compliant transport stream. It contains a single 10-bit
Figure 1 - System Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2005, Zarlink Semiconductor Inc. All Rights Reserved.


ZL10210 데이터시트, 핀배열, 회로
ZL10210
Data Sheet
analog-to-Digital Converter (ADC), a digital QAM demodulator and Forward Error Correcting (FEC) decoder. The
QAM demodulator supports QAM constellations 16 to 256. Both the QAM demodulator and the FEC are DVB and
ITU-T J.83 annex A/C compliant.
www.DataSheet4U.com
Figure 2 - ZL10210 Functional Diagram
The ADC uses a fixed sample rate greater than four times the maximum symbol rate. Hence for 1 to 9 MBaud appli-
cations, the signal has to be sampled at a frequency around 36 MHz. The spectrum of the analog signal being
sampled may be located at near-zero IF (e.g. centered at 9 MHz) or it may be located at a conventional IF such as
36.2 MHz or 43.5 MHz.
First consider the case of IF sampling a 1 to 7 MBaud QAM signal centered at 36.2 MHz intermediate frequency.
The sampling frequency chosen for this application is 28.9 MHz. This sampling process will fold the 36.2 MHz IF
spectrum to one centered at 7.3 MHz.
Second consider the case of IF sampling a 1 to 6 MBaud QAM signal centered at 43.5 MHz IF. The sampling
frequency chosen for this application is 25 MHz. This sampling process will result in a QAM spectrum centered at
6.5 MHz.
In the second case the sampling process results in spectral inversion. Even in first case the IF spectrum may be
spectrally inverted. However, spectral inversion is not an issue with ZL10210 since it automatically detects and
corrects for this in the digital domain.
The digital signal is first mixed down to baseband. However, as a result of tuning errors this signal will not be
centered at zero frequency. ZL10210 has an automatic frequency control (AFC) loop that can track out tuning
errors and hence in the tracking phase this signal will be centered at zero frequency. The AFC loop can typically
compensate for +/-350 kHz frequency offsets. Larger offsets can be corrected by programming on-chip registers.
The baseband signal is filtered to reduce the effect of adjacent channels. Additional on-chip digital filtering is
provided for low symbol rate applications. For example, it is possible to demodulate and decode a 1 MBaud QAM
signal using only one external 8 MHz SAW filter.
2
Zarlink Semiconductor Inc.




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DVB-C Cable Channel Demodulator - Zarlink Semiconductor