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ZLNB1001 DBS tone and polarity multiplex controller
Description
The ZLNB1001 multiplex controller is one of a wide range of satellite receiver LNB and IF distribution support circuits available from Zetex. It supports a single IF path providing logic outputs to select one of four IF switch input channels, which typically using PIN diodes. It is intended for use in multi-switch applications for selection and distribution of universal LNB IF output signals, replacing many discrete components including the voltage regulator to save both manufacturing cost and PCB size whilst improving reliability. The highly accurate control input of the ZLNB1001 has both voltage and tone control for the four required states. The voltage threshold is nominally 14.5 V and to meet the demanding requirements of some broadcasters it has a switching range of 14.0 V to 15 V. The threshold is temperature compensated to minimize drift. This features a low and stable input current that enables transient protection to be achieved with the addition of only a single resistor. The outputs are configured to deliver a positive regulated voltage drive of 7 V when a desired channel is selected, and 0V when de-selected.
Features
Precision voltage and tone detectors Temperature compensated Low cost solution Integrated tone filter Powered from STB: no additional power requirement Direct drive to PIN diodes SO8 SMD package
Pin out - top view
VIN VPOL FIN GND
1 2 3 4 8 7 6 5
Applications
Switch boxes for satellite IF distribution LNB receivers
VOUT4 VOUT3 VOUT2 VOUT1
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ZLNB1001
Absolute maximum ratings
Input voltage Output current Operating temperature Storage temperature 25V 50mA -40 to 85C -50 to 150C
Electrical characteristics
Test conditions (unless otherwise stated): Vin = 10V to 21V via series resistor as test circuit, Tamb = 25C Symbol IS IPOL VTVPOL* VTFIN VOUTH Parameter Supply current Input current at VPOL Threshold voltage Conditions IOUT = 0 VPOL = 15V Vin = 15V Tamb = -40 to 80C Vin = 15V f = 22kHz For selected output, IOUT = 20 mA (source) For selected output, IOUT = 0 VOUTL TSW Output voltage "low" Switching speed For unselected output, IOUT = -1 mA (sink) Min. 1.5 130 Typ. 3.2 220 Max. 5.5 350 Units mA A
14
14.5
15
V
Tone threshold Output voltage "high"
100 6.5 7.5
170 7 8 0.15
350 7.5 8.5 0.5 10
mV p-p V V V ms
NOTES: * Threshold voltage is adjustable using external resistor. Waveform of 22 kHz tone is shown in test circuit diagram.
Truth table
Tone Off Off On On VPOL < VTPOL > VTPOL < VTPOL > VTPOL Output 1 High Low Low Low Output 2 Low High Low Low Output 3 Low Low High Low Output 4 Low Low Low High Satellite signal Low band Vert Low band Horiz High band Vert High band Horiz
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ZLNB1001
Typical application circuit using pin diodes
Input, low band vert
Input, low band horiz IF out Input, high band vert R3 1k typical
Input, high band horiz
C11 47pF typical
C2 C3 C4 R1 R2 47R 1k U1
1 2 3 VIN VPOL FIN GND ZLNB1001 VOUT4 VOUT3 VOUT2 VOUT1 8 7 6 5
47pF typical 47pF typical 47pF typical 47pF typical
C5
C1
4.7nF
4
Application information
The schematic diagram above shows the typical application driving RF signal PIN diodes. Values of suitable external components are shown. R1 R2 and C1 are required to achieve specified operation. Values of other components are typical of the application. When one signal path is selected according to the Truth Table, the selected signal diodes carry a forward current set by R3. The other signal diodes are biased off, R3 providing a degree of reverse bias. In order to limit the peak current in the device, it is recommended that the output decoupling capacitor value, including C2, C3, C4 and C5, should not be excessive. Normally this total is expected to be less than a few hundred pF in the intended application.
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ZLNB1001
Package details - SO8
Package dimensions
Dimensions in inches are control dimensions, dimensions in millimeters are approximate. DIM Millimeters Min. A A1 D H E L 1.35 0.10 4.80 5.80 3.80 0.40 Max. 1.75 0.25 5.00 6.20 4.00 1.27 Inches Min. 0.053 0.004 0.189 0.228 0.150 0.016 Max. 0.069 0.010 0.197 0.244 0.157 0.050 h e b c DIM Millimeters Min. Max. Inches Min. Max.
1.27 BSC 0.33 0.19 0 0.25 0.51 0.25 8 0.50 -
0.050 BSC 0.013 0.008 0 0.010 0.020 0.010 8 0.020 -
Europe Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com
Americas Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com
Asia Pacific Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com
Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com
These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contact or be regarded as a representation relating to the products or services concerned. The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
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