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参数资料
| 型号： | ZL10037 |
| 厂商： | Zarlink Semiconductor Inc. |
| 英文描述： | Digital Satellite Tuner with RF Bypass |
| 中文描述： | 数字卫星调谐器射频旁路 |
| 文件页数： | 5/33页 |
| 文件大小： | 410K |
| 代理商： | ZL10037 |
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ZL10037
Data Sheet
5
Zarlink Semiconductor Inc.
1.0 Circuit Description
1.1 Functional Description
The ZL10037 is a single chip wide band direct conversion tuner with integral RF bypass optimised for digital
satellite receiver systems. It provides excellent signal handling capability in the presence of high composite signal
levels.
The device offers a highly integrated solution for a satellite tuner incorporating a low phase noise PLL frequency
synthesizer, 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 ZL10037 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 ZL10037 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 ZL10037 is divided into two stages. The first stage 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
section. The second stage is a programmable gain stage to reduce RF gain by 10 dB. This would normally be used
when an external LNA is being used to improve system sensitivity.
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 < 10 MS/s.
8
×
2
35
.
×
3
=
SymbolRate
fc
width
FilterBand
dB
相关PDF资料 |
PDF描述 |
|---|---|
| ZL10037LCF | Digital Satellite Tuner with RF Bypass |
| ZL10037LCF1 | Digital Satellite Tuner with RF Bypass |
| ZL10037LCG | Digital Satellite Tuner with RF Bypass |
| ZL10037LCG1 | Digital Satellite Tuner with RF Bypass |
| ZL10038LDG | MULTIMETER, DIGITAL; Accuracy, AC voltage range:+/-1.5% rdg + 3 digits; Accuracy, DC current range:+/-2.5% rdg + 3 digits; Accuracy, DC voltage range:+/-1.2% rdg + 3 digits; Accuracy, resistance range:+/-1.5%rdg + 3 digits; Current RoHS Compliant: NA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL10037LCF | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Digital Satellite Tuner with RF Bypass |
| ZL10037LCF1 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Digital Satellite Tuner with RF Bypass |
| ZL10037LCG | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Digital Satellite Tuner with RF Bypass |
| ZL10037LCG1 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Digital Satellite Tuner with RF Bypass |
| ZL10038LDG | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Digital Satellite Tuner with RF Bypass |
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