Diodes ZLNB2013 User Manual download pdf

DESCRIPTION

The ZLNB2013 dual polarization 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 polarization selection,

local oscillator selection and down feed 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 polarization control inputs of the ZLNB2013

have a threshold voltage of 14.75V to meet the

switching requirement of 14.0V to 15.5V. To minimize

drift both thresholds are temperature compensated.

Each features a low and stable input current that

enables threshold trimming and 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

polarization input of the ZLNB2013 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 down feed

driver, eliminating any problems due to cable

mismatch.

FEATURES

•

Dual polarization and tone switch

•

Temperature compensated polarization switches

•

Reduced cost solution, only 2 external components

per channel

•

Multiplexer IC direct drive

•

Tone and pol. outputs are TTL, CMOS, pin diode and

IF amp capable

•

Transient resistant inputs

•

Includes receiver-off detector

•

User adjustable filter centre frequency and

bandwidth

Universal LNB local oscillator selection is achieved by

detection of a low level AC voltage superimposed on

the polarization control voltage. To facilitate this

function, the ZLNB2013 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 to give excellent rejection

of low frequency control signals and DiSEqC™ tone

bursts.

The ZLNB2013 has been specifically designed to

minimize the solution cost whilst being flexible. The

ZLNB2013 only requires two external components per

channel to give full user control and functionality. The

ZLNB2013 also includes complimentary outputs so

that it can directly drive many multiplexer ICs without

the need of an inverter. Any unused outputs can be left

open circuit without any effect to the remaining

circuits. Polarization switch and tone detector outputs

can directly drive TTL and CMOS logic, pin diodes,

IF-amp supply switching and multiplexer ICs.

The ZLNB2013 operates from a single supply which can

be anything from 5-8V. Its quiescent current is typically

only 9mA and this does not change significantly with

load or logic state. It is available in the space saving

QSOP16 surface mount package.

•

Low frequency and DiSEqC™ control signals

rejection

•

Eliminates many close tolerance discrete

components

•

Wide supply operating range

•

Low quiescent current

APPLICATIONS

•

Twin Universal LNB’s

•

Quad Universal LNB’s

•

Multi Feed Universal LNB’s

•

LNB switch boxes

ISSUE 1 - AUGUST 2005

DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER

ZLNB2013

1 2 3 4 5 6 7 8

ZLNB2013 1

Summary of Contents

Page 1 - ZLNB2013

DESCRIPTIONThe ZLNB2013 dual polarization and tone switchcontroller is one of a wide range of satellite receiverLNB support circuits available from Ze

Page 2

ZLNB2013ISSUE 1 - AUGUST 20052ABSOLUTE MAXIMUM RATINGSSupply voltage -0.6V to 12VSupply current 500mAVPOL1and VPOL2Input voltage 25V ContinousOperatin

Page 3

ISSUE 1 - AUGUST 2005ZLNB20133SYMBOL PARAMETER CONDITIONSLIMITSUNITSMin. Typ. Max.TD 1,2 OutputsVVHIGHVVLOWVoltage highVoltage LowITD 1,2=-100␮A, Test

Page 4

ZLNB2013ISSUE 1 - AUGUST 20054TEST CIRCUIT 1 (ZLNB2013 Pinout for QSOP16 package designator - Q16)

Page 5

The following diagram shows a typical block diagramfor a twin universal LNB design. The ZLNB2013 deviceprovides the two polarity and two tone switches

Page 6

ZLNB2013APPLICATION CIRCUIT EXAMPLESISSUE 1 - AUGUST 20056The following circuit shows the additional components that will be used for polarisation mod

Page 7

FURTHER INFORMATIONInputs Vpol1 and Vpol2 are designed to be wired to thepower inputs of an LNB via a high value (2.2k) resistors.Input Vpol1 controls

Page 8

ISSUE 1 - AUGUST 2005ZLNB2013EuropeZetex GmbHStreitfeldstraße 19D-81673 MünchenGermanyTelefon: (49) 89 45 49 49 0Fax: (49) 89 45 49 49 49europe.sales@

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Diodes ZLNB2013 User Manual

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