zlnb2004 Zetex Semiconductors plc., zlnb2004 Datasheet

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zlnb2004

Manufacturer Part Number
zlnb2004
Description
Zlnb2004 - Dual Tone And Polarity Switch Lnb Multiplex Controller
Manufacturer
Zetex Semiconductors plc.
Datasheet

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DUAL TONE and POLARITY SWITCH LNB
MULTIPLEX CONTROLLER
ISSUE 1- NOVEMBER 1998
DEVICE DESCRIPTION
The ZLNB200X 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 Universal LNBs,
replacing many discrete components to save
both manufacturing cost and PCB size whilst
improving reliability.
The two polarisation control inputs of the
ZLNB200X have a nominal threshold of
14.75V. 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.
Twin Universal LNBs can be called to
operate with one of their controlling
receivers powered down/disconnected, with
attendant cable mismatch problems. To
e ase de sign for this situation, each
polarisation input of the ZLNB200X has a
second threshold set at 9.5V. An input
voltage below this threshold indicates
FEATURES
Dual polarisation switch
Temperature compensated polarisation
switch threshold
Transient resistant inputs
Includes Receiver-Off detector
Dual tone switch
User adjustable filter centre frequency
and bandwidth
User adjustable tone switching delays
(ZLNB2003/4 only)
Tone and pol. outputs TTL, CMOS, Pin
diode and IF amp capable
81
"receiver not present", switching the
channels Enable pin low. 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 ZLNB200X includes a separate tone
detector for each channel. Full control of
detector bandwidth and sensitivity is
provided using two external resistors and
capacitors. In the ZLNB2003/4, additional
control of tone switch delays is provided to
assist with the rejection of low frequency
control signals intended for other systems.
Polarisation switch and tone detector
outputs can source and sink 10mA making
them suitable to drive TTL and CMOS logic,
pin diodes and for IF-amp supply switching.
The ZLNB200X operates from a single
supply which can be anything from 5-10V. Its
quiescent current is typically only 6mA and
this does not change significantly with load
or logic state. It is available in the space
saving QSOP16 surface mount package.
APPLICATIONS
Receiver-Off detector TTL and CMOS
compatible
Wide supply operating range
Low quiescent current
Few external components
Eliminates many discrete components
Twin Universal LNB
Twin Universal IF switch boxes
LNB switch boxes
ZLNB2001 ZLNB2002
ZLNB2003 ZLNB2004

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zlnb2004 Summary of contents

Page 1

... User adjustable tone switching delays (ZLNB2003/4 only) Tone and pol. outputs TTL, CMOS, Pin diode and IF amp capable ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 "receiver not present", switching the channels Enable pin low. This logic output can be used to disable the associated downfeed driver, eliminating any problems due to cable mismatch ...

Page 2

... B Current V V (Note 1) RF1=150k out out I I (Note 1) Vout=1.96V, Vfin=2.1V out out G Voltage Gain F=22kHz, Vin=1mV V Rectifier (ZLNB2003 and ZLNB2004 ONLY) V Vout (Note 1) RF1=150k, IL=10 A REC ILeakage RF1=150k, Vout=3V (Note 1) Power Dissipation (T QSOP16 =33k CAL1 Min 5 =IT =0 out1,2 =0,IHV =10mA, out1,2 =15 ...

Page 3

... ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated): T 25°C,V =5V,I =10mA (R amb CC D SYMBOL PARAMETER Comparator (ZLNB2003 and ZLNB2004 ONLY) V Threshold F=0 TH (Note 1) Tout 1/2 V Outputs ITout1,2=-20 A, Test Circuit 1, VHIGH Voltage High Tone enabled V ITout1,2=-10mA, Test Circuit 1, VHIGH Voltage High Tone enabled V ITout1,2=10mA, Test Circuit 1, ...

Page 4

... OUT2 OUT1 F F IN1 IN2 V V POL2 POL1 + REC2 C REC1 ND F OUT2 OUT1 F IN1 IN2 V POL2 POL1 + 100nF 1M 84 ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 C2 68pF R2 150k C1 470pF R1 10k + V2 - (see Note 1) C2 68pF R2 150k C1 470pF R1 V1 10k (see Note 1) ...

Page 5

... Frequency (Hz) Open Loop Phase v Frequency 1.4 Vcc = 5V Vin=0.1Vp/p Test Circ. 1 1.2 1.0 0.8 0.6 0.4 0.2 0 100 1k 10k 100k Frequency (Hz) Filter Response ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 0.4 0.3 0.2 0.1 0 10M Load Current (mA) HV/Tout Voltage Low v Load Current 5.0 4.8 4.6 4.4 4.2 4.0 10M Load Current (mA) HV/Tout Voltage High v Load Current ...

Page 6

... ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 The following block diagram shows a typical block diagram twin universal LNB design. The ZLNB200X devices provides the two polarity and two tone switches required to decode the two independent receiver feeds. The devices are also able detect the absence ...

Page 7

... ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 APPLICATION CIRCUIT EXAMPLES The following circuit shows the additional components that will be used for polarisation mode and 22kHz tone detection in a typical ZLNB2001/2 application. C4 68pF R4 150k C3 470pF R3 10k LNB Downfeed No.2 The following circuit shows the additional components that will be used for polarisation mode and 22kHz tone detection in a typical ZLNB2003/4 application ...

Page 8

... capacitor of 100nF and resistor of 1MW will give a low to high delay of around 2.2ms and a high to low delay of 20ms, providing immunity to the 60Hz square wave signal occasionally used for switching between multiple LNB units. pin, POL 87 ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 ...

Page 9

... ZLNB2001,2,3,4 <=8V Fin2 Tout 1 Tout 2 22kHz High High - Low Low 22kHz High High - Low Low POL2 OUT1 <=14V Low Low >=15.5V High High <=14V High High >=15.5V Low Low <= ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 Enable 1 /2 OUT2 High High High High Low ...

Page 10

... ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 CONNECTION DIAGRAMS QSOP16 Package Suffix - Q16 Top View Applies to ZLNB2001 QSOP16 Package Suffix - Q16 Top View Applies to ZLNB2004 ORDERING INFORMATION Part Number Package ZLNB2001Q16 QSOP16 ZLNB2002Q16 QSOP16 ZLNB2003Q16 QSOP16 ZLNB2004Q16 QSOP16 QSOP16 Package Suffix - Q16 Top View ...

Page 11

... FOR PIN 1 PIN No.1 QSOP16 DIM Millimetres MIN MAX A 4.80 4.98 B 0.635 C 0.177 0.267 D 0.20 0.30 E 3.81 3.99 F 1.35 1.75 G 0.10 0.25 J 5.79 6.20 K 0° 8° Inches MIN MAX 0.189 0.196 0.025 NOM 0.007 0.011 0.008 0.012 0.15 0.157 0.053 0.069 0.004 0.01 0.228 0.244 0° 8° 91 ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 ...

Page 12

... Millimetres Inches Min Max Min A 4.80 4.98 0.189 B 1.27 BSC 0.05 BSC C 0.53 REF 0.02 REF D 0.36 0.46 0.014 E 3.81 3.99 0.15 F 1.35 1.75 0.05 G 0.10 0.25 0.004 J 5.80 6.20 0.23 K 0° 8° 0° L 0.41 1.27 0.016 ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004 MAX 0.044 0.008 0.014 0.007 0.120 NOM NOM 0.120 0.198 0.026 6° Max 0.196 0.018 0.157 0.07 0.010 0.24 8° 0.050 83 ...

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