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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
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. 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.
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
Receiver-Off detector TTL and CMOS compatible Wide supply operating range Low quiescent current Few external components Eliminates many discrete components
APPLICATIONS
Twin Universal LNB Twin Universal IF switch boxes LNB switch boxes
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ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Supply Current VPOL1 and VPOL2 Input Voltage Operating Temperature Storage Temperature -0.6V to 12V 100mA 25V Continuous -40 to 70C -40 to 85 Power Dissipation (Tamb= 25C) QSOP16 500mW
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated): Tamb= 25C,VCC=5V,ID=10mA (RCAL1 =33k)
SYMBOL PARAMETER VCC ICC Supply Voltage Supply Current IHVout1,2=ITout1,2=0 ITout1,2=0,IHVout1,2=10mA, VPOL=15.5V VPOL1 and VPOL2 Inputs IPOL VTPOL TSPOL Current Threshold Voltage Switching Speed IHVout1 and IHVout2 Outputs VHVHIGH Voltage High VHVHIGH Voltage High VHVLOW Voltage Low Enable 1,2 Outputs VENHIGH Voltage High VENHIGH Voltage High VENLOW Voltage Low Filter Amplifier IB Vout Iout GV VREC Input Bias Current Vout (Note 1) Iout (Note 1) Voltage Gain Vout (Note 1) ILeakage RF1=150k RF1=150k Vout=1.96V, Vfin=2.1V F=22kHz, Vin=1mV RF1=150k, IL=10A RF1=150k, Vout=3V (Note 1) 82 0.02 1.75 400 0 1.8 0.07 1.95 520 46 2.0 20 2.2 200 0.25 2.15 650 A V A dB V nA IEnable1,2=-100A,VPOL1,2 = 10V VCC-1.0 VCC-0.75 VCC IEnable1,2=20A,VPOL1,2 = 8.0V IEnable1,2=500A,VPOL1,2 =8.0V 0 0 0.14 0.25 VCC 0.5 V V V IHVout1,2=-20A,VPOL1,2 = 15.5V IHVout1,2=-10A,VPOL1,2 = 14V VCC-0.2 VCC-0.1 VCC 0 0.29 0.5 V V V IHVout1,2=-10A,VPOL1,2 = 15.5V VCC-1.0 VCC-0.9 VCC VPOL1 = VPOL2 = 25V (Note 2) Tamb=-40C to 70C (Note 2) 10 14.0 25 14.75 40 15.5 100 A V s CONDITIONS Min 5 5.5 26 LIMITS Typ Max 10 12 32 V mA mA UNITS
Rectifier (ZLNB2003 and ZLNB2004 ONLY)
ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated): Tamb= 25C,VCC=5V,ID=10mA (RCAL1 =33k)
SYMBOL PARAMETER Min Comparator (ZLNB2003 and ZLNB2004 ONLY) VTH Threshold (Note 1) Tout 1/2 Outputs Voltage High Voltage High VVLOW Voltage Low Note:1) The parameters Filter Amplifier Vout, Iout, Rectifier Vout and Comparator Threshold Voltage are all directly (linearly) related to Vcc. 2) Applied via 10k resistors F=0 2.95 3.2 3.45 V LIMITS Typ Max UNITS
VVHIGH VVHIGH
ITout1,2=-20A, Test Circuit 1, Tone enabled ITout1,2=-10mA, Test Circuit 1, Tone enabled ITout1,2=10mA, Test Circuit 1, Tone disabled
VCC-0.2 VCC-0.1 VCC VCC-1.0 VCC-0.9 VCC 0 0.29 0.5
V V V
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ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
TEST CIRCUIT 1
ZLNB2001 ZLNB2002
C4 68pF R4 150k C3 470pF
GND FOUT2 FIN2 VPOL2 VCC
C2
R2 150k
68pF
FOUT1 FIN1 VPOL1
C1 470pF
R3 10k
V1 5V
+ -
R1 10k
(see Note 1)
V2
+ -
TEST CIRCUIT 2
ZLNB2003 ZLNB2004
C4
68pF
CREC2 GND FOUT2 FIN2 VPOL2 VCC CREC1 FOUT1 FIN1 VPOL1
C2
R4 150k C3
470pF
R2 150k
68pF
C1 470pF
R3 10k
R6 1M
C6 100nF
C5 100nF
+ R5 1M
V1 5V
R1 10k
(see Note 1)
V2
+ -
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ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
TYPICAL CHARACTERISTICS
70
Vcc = 5V
0.4
Vcc = 5V
Open Loop Gain (dB)
60 50 40 30 20 10 0 100 1k 10k 100k 1M 10M
HV/Tout Voltage Low (V)
0.3
0.2
Tamb = 70C Tamb = 25C Tamb = -40C
0.1
0 0 2 4 6 8 10
Frequency (Hz)
Load Current (mA)
Open Loop Gain v Frequency
HV/Tout Voltage Low v Load Current
5.0
Open Loop Phase (Degrees)
Vcc = 5V
Vcc = 5V
HV/Tout Voltage High (V)
180 150 120 90 60 30 0 100 1k 10k 100k 1M 10M
4.8 4.6 4.4 4.2 4.0 0 2 4 6 8 10
Tamb = 70C Tamb = 25C Tamb = -40C
Frequency (Hz)
Load Current (mA)
Open Loop Phase v Frequency
HV/Tout Voltage High v Load Current
1.4 1.2
Vcc = 5V Vin=0.1Vp/p Test Circ. 1
Fout Voltage (Vp/p)
1.0 0.8 0.6 0.4 0.2 0 100 1k 10k 100k 1M
Frequency (Hz)
Filter Response
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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 of a receiver connected to either port of the LNB providing an Enable signal allowing the 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.
Horizontal Gain Stage GaAs/HEMTFET Antenna
High Band
Control Input <=13V-Horizontal >=14.5V-Vertical
DC Input 13-25V High Band Horizontal Low Band Horizontal H/V Output 1
+
Mixer
1
3
+
Low Band
Low Band
High Band
+
2
High Band
ASTRA 10.95 GHz-11.7 GHz Standard Band 10.7 GHz-11.8 GHz Enhanced Band
Bias Generator ZNBG40XX Series
ZLNB20XX Series Dual H/V Switch & 22kHz Switch
Control
PIN Diode MUX
IF down feed 950-1750 MHz - Standard Band 950-2050 MHz - Enhanced Band
High Band Vertical Low Band Vertical
4
H/V Output 2
Mixer
Vertical Antenna
Gain Stage GaAs/HEMTFET
+
Low Band
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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.
VCC
ZLNB2001
C4
68pF
VCC GND FOUT2 FIN2 VPOL2
C2
R4 150k C3
470pF
R2 150k
68pF
FOUT1 FIN1 VPOL1
C1 470pF
R3 10k
R1 10k
LNB Downfeed No.2
LNB Downfeed No.1
The following circuit shows the additional components that will be used for polarisation mode and 22kHz tone detection in a typical ZLNB2003/4 application.
VCC
ZLNB2003
C4
68pF
CREC2 GND FOUT2 FIN2 VPOL2 VCC CREC1 FOUT1 FIN1 VPOL1
C2
R4 150k C3
470pF
R2 150k
68pF
C1 470pF
R3 10k
R6 1M
C6 100nF
C5 100nF
R5 1M
R1 10k
LNB Downfeed No.2
LNB Downfeed No.1
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ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
FURTHER INFORMATION
1) Inputs VPOL1 and VPOL2 are designed to be wired to the power inputs of an LNB via high value (10k) resistors. Input VPOL1 controls outputs HVout1 and Enable1. Input VPOL2 controls outputs HVout2 and Enable2. With either input voltage set at or below 14V, the corresponding HVout pin will be in active. With either input v o l ta g e a t or a b ov e 1 5 .5 V, t he corresponding HVout pin will be active. Should the voltage applied to either VPOL input fall below 8V, the corresponding Enable pin will be low, otherwise these outputs will be high.Any input or output not required may be left open-circuit. 2) The ZLNB2001/2 includes the circuitry necessary to detect the presence of 22kHz tones modulated on either of two supply inputs to the lnb. The main elements of the detectors in each channel are an op-amp enabling the construction of a Sallen Key filter, a rectifier/smoother and a comparator. Full user control is given over the centre frequency and bandwidth of the filter using two external resistors and capacitors (one of these resistors shares the function of overvoltage protection of the corresponding VPOL pin, i.e. the 10k referenced in note 1). The comparator circuit utilises no external components. The presence of a 22kHz tone applied to pin Fin1 or Fin2 switches the corresponding output Tout1 or Tout2 high. 3) The ZLNB2003 / 4 includes the circuitry necessary to detect the presence of 22kHz tones modulated on either of two supply inputs to the LNB. The main elements of the detectors in each channel are an op-amp enabling the construction of a Sallen Key filter, a rectifier/smoother and a comparator. Full user control is given over the centre frequency and bandwidth of the filter using two external resistors and capacitors (one of these resistors shares the function of overvoltage protection of the corresponding Vpol pin, i.e. the 10k referenced in note 1). The comparator circuit utilises no external components. The presence of a 22kHz tone applied to pin Fin1 or Fin2 switches the corresponding output Tout1 or Tout2 87 high. Pins Crec1 and Crec2 make accessible the outputs of the tone switch rectifiers and provides a means of c o n tr o l l i n g t o n e s w i tc h d e l a y s. Significant switching delays may be necessary to avoid incorrect operation in the presence of unwanted interference (e.g. switching tones intended for other s i g n a l l i n g sy st e m s ). F or cor re ct operation of the IC, a capacitor and a parallel connected resistor should be connected between each Crec pin and ground. The Tout low to high delays are set solely by the added capacitors at approximately 22ms/uF. The high to low delays are set by the time constant of each resistor capacitor combination at a p p r o x i m a t e l y 0 . 2 CR s e c o nd s . A 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.
ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
TONE DETECTION FUNCTION
Fin1 ZLNB2001/3 22kHz ZLNB2002/4 22kHz VPOL1 ZLNB2001/3 <=14V >=15.5V ZLNB2002/4 <=14V >=15.5V ZLNB2001,2,3,4 <=8V Fin2 22kHz 22kHz VPOL2 <=14V >=15.5V <=14V >=15.5V <=8V Tout 1 High Low High Low HVOUT1 Low High High Low Tout 2 High Low High Low HVOUT2 Low High High Low Enable 1 /2 High High High High Low
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ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
CONNECTION DIAGRAMS
QSOP16 Package Suffix - Q16 QSOP16 Package Suffix - Q16
Top View Applies to ZLNB2001 QSOP16 Package Suffix - Q16
Top View Applies to ZLNB2002 QSOP16 Package Suffix - Q16
Top View Applies to ZLNB2004
Top View Applies to ZLNB2003
ORDERING INFORMATION
Part Number ZLNB2001Q16 ZLNB2002Q16 ZLNB2003Q16 ZLNB2004Q16 Package QSOP16 QSOP16 QSOP16 QSOP16 Part Mark ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
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PACKAGE DIMENSIONS
IDENTIFICATION RECESS FOR PIN 1 A C B
J
PIN No.1
D
F
K G
QSOP16
DIM Millimetres MIN A B C D E F G J K 4.80 0.635 0.177 0.20 3.81 1.35 0.10 5.79 0 0.267 0.30 3.99 1.75 0.25 6.20 8 MAX 4.98 Inches MIN 0.189 MAX 0.196
0.025 NOM 0.007 0.008 0.15 0.053 0.004 0.228 0 0.011 0.012 0.157 0.069 0.01 0.244 8
91
E
ZLNB2001 ZLNB2002 ZLNB2003 ZLNB2004
MSOP8 DIM A A1 B C D e e1 E H L Millimetres MIN 0.91 0.10 0.25 0.13 2.95 0.65 0.33 2.95 4.78 0.41 0 MAX 1.11 0.20 0.36 0.18 3.05 NOM NOM 3.05 5.03 0.66 6 Inches MIN 0.036 0.004 0.010 0.005 0.116 0.0256 0.0128 0.116 0.188 0.016 0 MAX 0.044 0.008 0.014 0.007 0.120 NOM NOM 0.120 0.198 0.026 6
SO8 DIM A B C D E F G J K L Millimetres Min 4.80 1.27 BSC 0.53 REF 0.36 3.81 1.35 0.10 5.80 0 0.41 0.46 3.99 1.75 0.25 6.20 8 1.27 Max 4.98 Inches Min 0.189 0.05 BSC 0.02 REF 0.014 0.15 0.05 0.004 0.23 0 0.016 0.018 0.157 0.07 0.010 0.24 8 0.050 Max 0.196
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