參數(shù)資料
型號(hào)： ZL10039LCG1
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 消費(fèi)家電
英文描述： Test, Recorder RoHS Compliant: NA
中文描述： SPECIALTY CONSUMER CIRCUIT, QCC28
封裝： 5 X 5 MM, LEAD FREE, MO-220, QFN-28
文件頁(yè)數(shù)： 6/35頁(yè)
文件大?。?/td> 694K
代理商： ZL10039LCG1
ZL10039
Data Sheet
6
Zarlink Semiconductor Inc.
1.0 Circuit Description
1.1 Functional Description
The ZL10039 is a single chip wide band direct conversion tuner with integral RF bypass optimised for digital
satellite receiver systems. It provides excellent performance in applications where maximum sensitivity is required.
The device offers a highly integrated solution for a satellite tuner incorporating a low phase noise PLL frequency
synthesiser, the quadrature down converter, a fully integrated local oscillator, and programmable baseband channel
filters. A minimal number of additional peripheral components are required. The crystal reference source can be
also used as the reference for the demodulator.
An I
2
C compatible bus interface controls all of the tuner functionality.
The ZL10039 contains both hardware and software power down modes.
1.2 Signal Path
1.2.1 RF Input
The tuner RF input signal at a frequency of 950 – 2150 MHz is fed to the ZL10039 RF input pre-amplifier stage.
The signal handling is designed such that no tracking filter is required to offer immunity to input signal composite
overload.
The RF input amplifier feeds an AGC stage, which provides RF gain control. There is additional gain adjustment in
the baseband section. The total AGC gain range will guarantee an operating dynamic range of –92 to –10 dBm.
The RF AGC in the ZL10039 is a continually variable gain control stage, and provides the main system AGC set
under control of the analogue AGC signal generated by the demodulator.
The analogue RF AGC is optimised for S/N and S/I performance across the full dynamic range. Typical RF AGC
characteristic and variation of IIP3, IIP2 and NF are shown in Section 8 - Typical Performance Curves.
The output of the AGC stage is coupled to the quadrature mixer where the RF signal is mixed with quadrature local
oscillator signals generated by the on-board local oscillator.
1.2.2 Baseband
The outputs of the quadrature down converter are passed through the baseband filters followed by a programmable
baseband gain stage.
The baseband paths are DC coupled. An integrated DC correction loop prevents saturation due to local oscillator
self-mixing in the converter section. No external components are required for dc correction.
The baseband filters are 5
th
order Chebychev and provide excellent matching in both amplitude and phase
between the I and Q channels. The filters are fully programmable for 3 dB bandwidths from 6 MHz to 43 MHz. The
recommended filter bandwidth is related to the required symbol rate by the following equation.
This equation makes no allowance for LNB tuning offset at low symbol rates < 10MS/s.
The baseband filter uses an automatic tuning algorithm to calibrate the filter bandwidth to the programmed
requirement. This removes any variation due to operating conditions and process variations. The automatic tuning
8
×
2
35
.
×
3
=
SymbolRate
fc
width
FilterBand
dB
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