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ZLNB2012

Zetex Semiconductors
Part Number ZLNB2012
Manufacturer Zetex Semiconductors
Description DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER
Published Apr 16, 2005
Detailed Description ZLNB2012 DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER DEVICE DESCRIPTION The ZLNB2012 dual polarisation and to...
Datasheet PDF File ZLNB2012 PDF File

ZLNB2012
ZLNB2012

Overview
ZLNB2012 DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER DEVICE DESCRIPTION The ZLNB2012 dual polarisation and tone switch controller is one of a wide range of satellite receiver LNB support circuits available from Zetex.
It features two completely independent channels, each providing logic outputs to control LNB polarisation selection, local oscillator selection and downfeed disable.
It is intended for use in Twin, Quad and multiple feed Universal LNBs, replacing many discrete components to save both manufacturing cost and PCB size whilst improving reliability.
The two highly accurate polarisation control inputs of the ZLNB2012 have a nominal threshold of 14.
25V and to meet the required demanding needs from some broadcasters they have a switching range of 14.
0V to 14.
5V.
The threshold is temperature compensated to minimise drift.
Each features a low and stable input current that enables transient protection to be achieved with the addition of only a single resistor per channel.
Multi Feed LNBs can be called to operate with one or more of their controlling receivers powered down/disconnected, with attendant cable mismatch problems.
To ease design for this situation, each polarisation input of the ZLNB2012 has a second threshold set at 9V.
An input voltage below this threshold indicates“ receiver not present”, and switches the relevant control channels high.
This logic output can be used to disable the associated downfeed driver, eliminating any problems due to cable mismatch.
Universal LNB local oscillator selection is achieved by detection of a low level AC voltage superimposed on the polarisation control voltage.
To facilitate this function, the ZLNB2012 includes a separate tone detector for each channel.
Control of detector bandwidth and sensitivity is provided using an external resistor and capacitor for each channel.
The tone detector has been designed give excellent rejection of low frequency control signals and DiSEqC™ tone bursts.
The ZLNB2012 has bee...


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