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PDF ZL10313 Data sheet ( Hoja de datos )
| Número de pieza | ZL10313 | |
| Descripción | Satellite Demodulator | |
| Fabricantes | Zarlink Semiconductor Inc | |
| Logotipo |  |
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ZL10313
Satellite Demodulator
Data Sheet
Features
• Conforms to EBU specification for DVB-S and
DirecTV specification for DSS
• On-chip digital filtering supports 1 - 45 MSps
symbol rates
• On-chip 60 or 90 MHz dual-ADC
• High speed scanning mode for blind symbol
rate/code rate acquisition
• Automatic spectral inversion resolution
• High level software interface for minimum
development time
• Up to ±22.5 MHz LNB frequency tracking
• DiSEqC™ v2.2: receive/transmit for full control of
LNB, dish and other components
• Compact 64-pin LQFP package (7 x 7 mm)
• A full DVB-S front-end reference design is
available, ref. ZLE10538
Applications
• DVB 1 - 45 MSps compliant satellite receivers
• DSS 20 MSps compliant satellite receivers
• SMATV (Single Master Antenna TV) trans-
modulators
• Satellite PC applications
November 2004
Ordering Information
ZL10313QCG
ZL10313QCG1
ZL10313UBH
64 Pin LQFP Trays, Bake & Drypack
64 Pin LQFP* Trays, Bake & Drypack
Die supplied in wafer form**
*Pb Free Matte Tin
**Please contact Sales for further details
0°C to +70°C
Description
The ZL10313 is a QPSK/BPSK 1 - 45 MSps
demodulator and channel decoder for digital satellite
television transmissions to the European Broadcast
Union ETS 300 421 specification. It receives analogue
I and Q signals from the tuner, digitises and digitally
demodulates this signal, implements the complete
DVB/DSS FEC (Forward Error Correction) and de-
scrambling function. The output is in the form of
MPEG2 or DSS transport stream data packets. The
ZL10313 also provides automatic gain control to the RF
front-end device.
The ZL10313 has a serial 2-wire bus interface to the
control microprocessor. Minimal software is required to
control the ZL10313 because of the built in automatic
search and decode control functions.
I I/P
Q I/P
Dual ADC
De-rotator
Decimation
Filtering
Timing recovery
Matched filter
Phase recovery
DVB
DSS
FEC
MPEG/
DSS
Packets
Analog
AGC
Control
Clock Generation
Acquisition
Control
2-Wire Bus Bus I/O
Interface
Figure 1 - Functional Block Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2004, Zarlink Semiconductor Inc. All Rights Reserved.
1 page  
ZL10313
Data Sheet
Overview
The ZL10313 is a QPSK/BPSK 1 - 45 MSps demodulator and channel decoder for digital satellite television
transmissions compliant to both DVB-S and DSS standards and other systems, such as LMDS, that use the same
architecture.
A Command Driven Control (CDC) system is provided making the ZL10313 very simple to program. After the tuner
has been programmed to the required frequency to acquire a DVB transmission, the ZL10313 requires a minimum
of five registers to be written.
The ZL10313 provides a monitor of bit error rate after the QPSK module and also after the Viterbi module. For
receiver installation, a high speed scan or 'blind search' mode is available. This allows all signals from a given
satellite to be evaluated for frequency, symbol rate and convolutional coding scheme. The phase of the IQ signals
can be automatically determined.
Full DiSEqC is provided for both writing and reading DiSEqC messages. Storage in registers for up to eight data
bytes sent and eight data bytes received is provided.
I I/P
Q I/P
Dual ADC
De-rotator
Decimation
Filtering
Timing recovery
Matched filter
Phase recovery
DVB
DSS
FEC
MPEG/
DSS
Packets
Analog
AGC
Control
Clock Generation
Acquisition
Control
Bus I/O
2-wire Bus
Interface
Figure 3 - ZL10313 Functional Block Diagram
5
Zarlink Semiconductor Inc.
5 Page 
VITERBI
Coarse
Bit
Error
Count
ZL10313
Data Sheet
VIT_MAXERR[3:0]
0
0
Data Bits
Status
Figure 7 - Viterbi Error Count Coarse Indication
2.4.2 The Frame Alignment Block
The frame alignment algorithm detects a sequence of correctly spaced synchronizing bytes in the Viterbi decoded
bit-stream and arranges the input into blocks of data bytes. Each block consists of 204 bytes for DVB and 147 bytes
for DSS. In the DSS mode, the synchronizing byte is removed from the data stream, so only 146 bytes of a block
are passed to the next stage. The frame alignment block also removes the 180° phase ambiguity not removed by
the Viterbi decoder.
2.4.3 The De-Interleaver Block
2.4.3.1 DVB
Before transmission, the data bytes are interleaved with each other in a cyclic pattern of twelve. This ensures the
bytes are spaced out to avoid the possibility of a noise spike corrupting a group of consecutive message bytes.
Figure 8 below shows conceptually how the convolutional de-interleaving system works. The synchronization byte
is always loaded into the First-In-First-Out (FIFO) memory in branch 0. The switch is operated at regular byte
intervals to insert successively received bytes into successive branches. After 12 bytes have been received,
byte 13 is written next to the synchronization byte in branch 0, etc. In the ZL10313, this de-interleaving function is
realized using on-chip Random Access Memory (RAM).
11
Zarlink Semiconductor Inc.
11 Page | ||
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