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PDF ZL10037 Data sheet ( Hoja de datos )
| Número de pieza | ZL10037 | |
| Descripción | Digital Satellite Tuner | |
| Fabricantes | Zarlink Semiconductor | |
| Logotipo |  |
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Features
• Direct conversion tuner for quadrature down
conversion from L-band to Zero IF
• Symbol rate 1-45 MSps
• High sensitivity <-83 dBm at 27.5 MSps
• Independent RF AGC and baseband gain control
• Fifth order baseband filters with bandwidth
www.DataSheet4Ua.cdojmustable from 6 to 43 MHz
• Fully integrated alignment-free low phase noise
local oscillator
• Selectable RF Bypass
• I2C compatible control
• 3.3 Volt Supply
• 28 pin 5x5 mm QFN Package
Applications
• DVB-S Free-to-Air Satellite receiver systems
• 8PSK Satellite Receiver Systems
ZL10037
Digital Satellite Tuner
with RF Bypass
Data Sheet
September 2005
Ordering Information
ZL10037LCG 28 Pin QFN Trays
ZL10037LCF 28 Pin QFN Tape and Reel
ZL10037LCG1 28 Pin QFN* Trays
ZL10037LCF1 28 Pin QFN* Tape and Reel
*Pb Free Matte Tin
-10°C to +85°C
Description
The ZL10037 is a fully integrated direct conversion
tuner for digital satellite receiver systems. It provides
excellent immunity to composite undesired channels.
The device also contains a RF Bypass for connecting
to a second receiver module.
The ZL10037 is simple to use, requiring no alignment
or tuning algorithms and uses a minimum number of
external components. The device is programmable via
a I2C compatible bus.
A complete reference design (ZLE10542) is available
using ZL10313 demodulator.
RF Input
ZL10037
Bypass
Output
Quadrature
VCO
PLL
RF AGC
I
Q
I2C
Control
Loop
Filter
Crystal
Figure 1 - Basic Block 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.
1 page  
ZL10037
Data Sheet
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 I2C compatible bus interface controls all of the tuner functionality.
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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 5th 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.
− 3dBFilterBandwidth fc = SymbolRate×1.35
2 × 0.8
This equation makes no allowance for LNB tuning offset at low symbol rates < 10 MS/s.
5
Zarlink Semiconductor Inc.
5 Page 
ZL10037
Data Sheet
The LEN bit enables the RFBYPASS output. With this bit set, the RF Bypass is active even if ‘software’ or
‘hardware’ power down has been selected.
The RFG bit controls the gain of the second section of RF gain control. With this bit set, the RF gain is reduced by
10dB. This setting would normally used when an external LNA is being used.
2.3 Base Band Registers
There are three registers that control the Base Band:
Bit Field
Name
Default
Type
Description
7:0
BF[7:0]
0X3C
R/W Base Band Filter Cut-Off Frequency
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Table 10 - Register 5
The bits BF[7:0] control the bandwidth of the baseband filter. An automatic adjustment routine synchronizes the
filter bandwidth to a reference frequency derived from the crystal.
Bit Field
Name
Default
Type
Description
7 - 0 R/W Test Mode
6 LF 0 R/W Baseband Filter Adjust Disable
5 SF 0 R/W Baseband Filter Adjust Disable
4:0
BR[4:0]
1000
R/W Base Band Reference Division Ratio
Table 11 - Register 6
The LF and SF bits disable the baseband filter adjustment. It is recommended that these bits are set after
programming the filter bandwidth to prevent interactions within the circuit. These bits must be reset to enable the
baseband filter bandwidth to be reprogrammed.
The BR[4:0] bits set the crystal reference divide ratio. This effectively determines the resolution setting of the
baseband filters. The baseband filter settings (BF[7:0]) can be calculated from the following equation.
BF[7 : 0] = (Filter bandwidth(MHz)* 5.088 * BR[4 : 0]) −1
CrystalFrequency (MHz)
See Section 3 Applications Information, for a typical programming example.
BR[4:0] = 0 is invalid
Bit Field
Name
Default
Type
Description
7 BLF - R Base Band Lock Flag
6:3
BG[3:0]
0111
R/W Base Band Gain Select
2:0 - 000 R/W Test Modes
Table 12 - Register 7
The BLF bit indicates that the baseband adjustment has completed and locked.
The control bits BG[3:0] define the gain of the Base Band post-filter amplifier. The following table shows the gain -
note this is relative gain. The 1.5 dB gain steps enable the baseband output level to be adjusted and optimise gain
distribution for different symbol rates.
11
Zarlink Semiconductor Inc.
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