ZLNB2012Q16 - Zetex Semiconductors

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.

FEATURES

·Dual polarisation and tone switch

·Reduced Cost Solution, only 2 external components

per channel

·Close tolerance (14-14.5V) and temperature

compensated polarisation switch

·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 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 been specifically designed to

minimise the solution cost whilst being flexible. The

ZLNB2012 only requires two external components per

channel to give full user control and functionality. The

ZLNB2012 also includes complimentary outputs so

that it can directly drive many multiplexer IC’s without

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

open circuit without any effect to the remaining circuits

operation Polarisation switch and tone detector

outputs can directly drive TTL and CMOS logic, pin

diodes, IF-amp supply switching and multiplexer IC’s.

The ZLNB2012 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

PROVISIONAL ISSUE A - OCTOBER 2001

DUAL TONE AND POLARITY SWITCH

LNB MULTIPLEX CONTROLLER

ZLNB2012

PROVISIONAL ISSUE A - OCTOBER 2001

ABSOLUTE MAXIMUM RATINGS

Supply Voltage -0.6V to 12V

Supply Current 500mA

VPOL1 and VPOL2

Input Voltage 25V Continous

Operating Temperature -40 to 80°C

Storage Temperature -40 to 85°C

Power Dissipation (Tamb 25 C)

QSOP16 500mW

SYMBOL PARAMETER CONDITIONS LIMITS UNITS

Min Typ Max

VCC Supply Voltage 5 8 V

ICC Supply Current HOR1,2= BHOR1,2= TD1,2= BTD1, 2= 0mA

VPOL1= VPOL2= Don’t Care

FIN1= FIN2= Don’t Care

912mA

VPOL1 and VPOL2 Inputs

IPOL

VTPOL

TSPOL

Current

Threshold Voltage

Switching Speed

VPOL1 =V

POL2 = 25V (Note 2)

Tamb=-40°C to 80°C

100

200

14.25

240

14.5

100

␮A

␮S

HOROUT1 and HOROUT2 Outputs

VHORHIGH

VHORLOW

Voltage High

Voltage Low

IHOROUT1,2=-100␮A,VPOL1,2=14.5V

IHOROUT1,2=5mA,VPOL1,2=14V

VCC-1.0

VCC 0.7

0.30

VCC

0.5

BHOROUT1 and BHOROUT2 Outputs

VBHORHIGH

VBHORLOW

Voltage High

Voltage Low

IBHOROUT1,2=-100␮A,VPOL1,2=14.0V

IBHOROUT1,2=5mA,VPOL1,2=14.5V

VCC-1.0

VCC 0.7

0.30

VCC

0.5

Enable 1,2

Outputs

VENHIGH

VENLOW

Voltage High

Voltage Low

IEnable 1,2=-100␮A,VPOL1,2=10V

IEnable 1,2=500␮A,VPOL1,2=8.0V

VCC-1.0

VCC 0.7

0.30

VCC

0.5

Filter Amplifier

VOUT Bias Voltage3Ifin=0 1.75 1.95 2.15 V

Finz Input Impedance VFIN=100mV p/p 150 ⍀

AG Amplifier Gain VFIN=100mV p/p 30 V/mA

FVTV Threshold3100 170 350 mV

p/p

ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):

Tamb=25⬚C,VCC=5V

Note:-

1) The parameters Filter Amplifier VOUT,I

OUT, Rectifier VOUT and Comparator Threshold Voltage are all directly (linearly)

related to Vcc.

2) Applied via 1k resistors

3) These parameters are linear related to VCC

PROVISIONAL ISSUE A - OCTOBER 2001

ZLNB2012

SYMBOL PARAMETER CONDITIONS LIMITS UNITS

Min Typ Max

TD 1,2 Outputs

VVHIGH

VVLOW

Voltage high

Voltage Low

ITD 1,2=-100␮A, Test Circuit 1,

Tone enabled

ITD 1,2=15mA, Test Circuit 1,

Tone disabled

VCC-1.0

VCC-0.7

0.3

VCC

0.5

BTD 1,2 Outputs

VVHIGH

VVLOW

Voltage high

Voltage Low

IBTD 1,2=-100␮A, Test Circuit 1,

Tone disabled

IBTD 1,2=15mA, Test Circuit 1,

Tone enabled

VCC-1.0

VCC-0.7

0.3

VCC

0.5

ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):

Tamb=25⬚C,VCC=5V

Note:-

1) The parameters Filter Amplifier VOUT,I

OUT, Rectifier VOUT and Comparator Threshold Voltage are all directly (linearly)

related to Vcc.

2) Applied via 1k resistors

3) These parameters are linear related to VCC

ZLNB2012

PROVISIONAL ISSUE A - OCTOBER 2001

(See Note 1)

CF110nF

RP1

1.0k

CF2

10nF

TD2

BHOR2

HOR2

ENA2

GND

TD1

HOR1

VCC

BHOR1

FIN1

ENA1

VPOL2 VPOL1

BTD2 1

FIN2

BTD1

RP2

1.0k

Note 1: V2 Characteristics

Type:- AC source

Frequency:- 22kHz

Voltage:- 300mVp/p Enabled

Tone Input (V2)

TD Outputs

Switching Delays

Zero Disabled

TEST CIRCUIT 1 (ZLNB2012 Pinout for QSOP16 package designator - Q16)

The following diagram shows a typical block diagram

for a twin universal LNB design. The ZLNB2012 device

provides the two polarity and two tone switches

required to decode the two independent receiver

feeds. The device is also able to detect the absence of a

revceiver connection to either port of the LNB

providing all outputs to go high hence disabling of the

port. This allows the avoidance of unwanted signal

reflections from an unterminated down feed cable.

Additionally the front end bias requirements of the LNB

are provided by the ZNBG4000 or ZNBG6000 offering a

very efficient and cost effective solution

PROVISIONAL ISSUE A - OCTOBER 2001

ZLNB2012

Bias Generator

ZNBG40XX

Series

ZLNB2012 Series

Dual H/V Switch

22kHz Switch

Vertical

Antenna

Horizontal

Antenna

Gain Stage

GaAs/HEMTFET

Gain Stage

GaAs/HEMTFET

IF down feed

950-1750 MHz

- Standard Band

950-2050 MHz

- Enhanced Band

H/V Output 2

H/V Output 1

Control Input

<=13V-Horizontal

>=14.5V-Vertical

Control

High Band

Horizontal

Low Band

Horizontal

High Band

Vertical

Low Band

Vertical

Diode

MUX

DC Input

13-25V

ASTRA

10.95 GHz-11.7 GHz

Standard Band

10.7 GHz-11.8 GHz

Enhanced Band

Mixer

Low Band

High Band

ZLNB2012

APPLICATION CIRCUIT EXAMPLES

PROVISIONAL ISSUE A - OCTOBER 2001

Vcc

LNB Downfeed No.1

CF110nF

RP1

1.0k

LNB Downfeed No.2

CF2

10nF

RP2

1.0k

TD2

BHOR2

HOR2

ENA2

GND

TD1

HOR1

VCC

BHOR1

FIN1

ENA1

VPOL2 VPOL1

BTD2 1

FIN2

BTD1

The following circuit shows the additional components that will be used for polarisation mode and 22kHz tone

detection in typical ZLNB2012 application (ZLNB2012 Pinout for QSOP16 package designator - Q16).

TD2

HOR2

BHOR2

ENA2

GND

BTD1

TD1

HOR1

VCC

FIN1

ENA1

VPOL2 VPOL1

BTD2

BHOR1

FIN2

ZLNB2012 PINOUT FOR QSOP16

PACKAGE DESIGNATOR - Q16 Part Number Package Part Mark

ZLNB2012Q16 QSOP16 ZLNB2012

ORDERING INFORMATION

Part Number Package Part Mark

#ZLNB2012Q16 QSOP16 ZLNB2012

SAMPLE ORDERING INFORMATION

FURTHER INFORMATION

Inputs Vpol1 and Vpol2 are designed to be wired to the

power inputs of an LNB via a high value (1K) resistors.

Input Vpol1 controls outputs HOR1, BHOR1 and ENA1.

Input Vpol2 controls outputs HOR2, BHOR2 and ENA2.

With either input voltage set at or below 14V, the

corresponding HOR pin will be active and the

corresponding BHOR pin will be the inverse of HOR.

With either input voltage at 14.5V or higher, the

corresponding HOR pin will be active and the

corresponding BHOR pin will be the inverse. Should

the voltage applied to either Vpol input fall below 8V,

the corresponding ENA (enable) pin will be low,

otherwise these outputs will remain high. Any input or

output may be left open circuit without any effect on

the remaining circuitry.

The ZLNB2012 includes all the circuitry necessary to

detect the presence of a 22kHz tone modulated on the

supply input to the LNB. The main elements of the

detector are an op-amp, a rectifier/smoother and a

comparitor. The op-amp has a pre-set internal

feedback resistor so that just a simple RC network

wired to the input gives user defined gain and low

frequency cut filter characteristics.

The RC network components also serve two other

purposes. The resistor provides overvoltage

protection for the Vpol pin and the capacitor minimises

tone interference of the Vpol threshold. The upper

frequency roll-off of the op-amp has been set internally

at above 100kHz to allow the amplifier to be used with

other common tone switch frequencies.

The rectifier/smoother/comparitor function is provided

by a complex propriety circuit that allows the

ZLNB2012 to reliably detect wanted tones whilst

ignoring low frequency square wave switch box

signals, DiSEqC™bursts and supply switching

transients common when using DiSEqC-2™ready

set-top boxes. This is all achieved without the need for

any further external components. The threshold of the

comparitor is supply dependent, hence the gain of the

preceding op-amp must be adjusted in line with supply

voltage.

Output Truth Table

The ZLNB2012 includes two independent channels, each containing a voltage detector and tone detector. The

following truth table applies to each channel:-

PROVISIONAL ISSUE A - OCTOBER 2001

ZLNB2012

Tone Vpol TD BTD HOR BHOR ENA

Off ⭐14V Low High Low High High

Off ⭓14.5V Low High High Low High

On ⭐14V High Low Low High High

On ⭓14.5V High Low High Low High

- <8V - - Low High Low

Zetex plc

Fields New Road

Chadderton

Oldham, OL9 8NP

United Kingdom

Telephone (44) 161 622 4422

Fax: (44) 161 622 4420

Zetex GmbH

Streitfeldstraße 19

D-81673 München

Germany

Telefon: (49) 89 45 49 49 0

Fax: (49) 89 45 49 49 49

Zetex Inc

700 Veterans Memorial Hwy

Hauppauge, NY11788

USA

Telephone: (631) 360 2222

Fax: (631) 360 8222

Zetex (Asia) Ltd

3701-04 Metroplaza, Tower 1

Hing Fong Road

Kwai Fong, Hong Kong

China

Telephone: (852) 26100 611

Fax: (852) 24250 494

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 contract 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.

For the latest product information, log on to www.zetex.com

PROVISIONAL ISSUE A - OCTOBER 2001

ZLNB2012

PACKAGE DIMENSIONS

DIM Millimetres Inches

MIN MAX MIN MAX

A 4.80 4.98 0.189 0.196

B 0.635 0.025 NOM

C 0.23 REF 0.009 REF

D 0.20 0.30 0.008 0.012

E 3.81 3.99 0.15 0.157

F 1.35 1.75 0.053 0.069

G 0.10 0.25 0.004 0.01

J 5.79 6.20 0.228 0.244

K0°8°0°8°

QSOP16