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 Applications ■ Switch boxes for satellite IF distribution ■ LNB receivers Issue 1 - September 2005 © Zetex Semiconductors plc 2005 1 VIN 1 8 VOUT4 VPOL 2 7 VOUT3 FIN GND 3 6 4 5 VOUT2 VOUT1 www.zetex.com ZLNB1001 Absolute maximum ratings Input voltage 25V Output current 50mA Operating temperature -40 to 85°C Storage temperature -50 to 150°C Electrical characteristics Test conditions (unless otherwise stated): Vin = 10V to 21V via series resistor as test circuit, Tamb = 25°C Symbol Parameter Conditions Min. Typ. Max. IS Supply current IPOL IOUT = 0 1.5 3.2 5.5 mA Input current at VPOL VPOL = 15V Vin = 15V 130 220 350 µA VTVPOL* Threshold voltage Tamb = -40 to 80°C Vin = 15V 14 14.5 15 V VTFIN Tone threshold f = 22kHz† 100 170 350 mV p-p VOUTH Output voltage “high” For selected output, IOUT = 20 mA (source) 6.5 7 7.5 V For selected output, IOUT = 0 7.5 8 8.5 V 0.15 0.5 V 10 ms VOUTL Output voltage “low” TSW Switching speed For unselected output, IOUT = -1 mA (sink) Units NOTES: * Threshold voltage is adjustable using external resistor. † Waveform of 22 kHz tone is shown in test circuit diagram. Truth table Tone VPOL Output 1 Output 2 Output 3 Output 4 Satellite signal Off < VTPOL High Low Low Low Low band Vert Off > VTPOL Low High Low Low Low band Horiz On < VTPOL Low Low High Low High band Vert On > VTPOL Low Low Low High High band Horiz Issue 1 - September 2005 © Zetex Semiconductors plc 2005 2 www.zetex.com 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 R1 R2 47R 1k U1 1 2 3 C1 4.7nF 4 VIN VOUT4 VPOL VOUT3 FIN VOUT2 GND VOUT1 8 C2 47pF typical C3 47pF typical C4 47pF typical C5 47pF typical 7 6 5 ZLNB1001 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. Issue 1 - September 2005 © Zetex Semiconductors plc 2005 3 www.zetex.com ZLNB1001 Package details - SO8 Package dimensions Dimensions in inches are control dimensions, dimensions in millimeters are approximate. DIM Millimeters Inches DIM Millimeters Min. Max. Inches Min. Max. Min. Max. A 1.35 1.75 0.053 0.069 e A1 0.10 0.25 0.004 0.010 b 0.33 0.51 0.013 0.020 D 4.80 5.00 0.189 0.197 c 0.19 0.25 0.008 0.010 H 5.80 6.20 0.228 0.244 ⍜ 0° 8° 0° 8° E 3.80 4.00 0.150 0.157 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 - - - - - 1.27 BSC Min. Max. 0.050 BSC Europe Americas Asia Pacific Corporate Headquarters Zetex GmbH Streitfeldstraße 19 D-81673 München Germany Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 [email protected] Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 [email protected] 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. Issue 1 - September 2005 © Zetex Semiconductors plc 2005 4 www.zetex.com