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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 DiSEqCTM 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.
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 * Low frequency and DiSEqC rejection control signals
* E l i m i n a t e s m a n y cl o se t o l e r a n ce d i scr e t e 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 1
ZLNB2012
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Supply Current VPOL1 and VPOL2 Input Voltage Operating Temperature Storage Temperature 25V Continous -40 to 80C -40 to 85C -0.6V to 12V 500mA
Power Dissipation (Tamb 25 C)
QSOP16 500mW
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated): Tamb= 25 C,VCC=5V
SYMBOL PARAMETER CONDITIONS Min V CC I CC Supply Voltage Supply Current HOR1,2= BHOR1,2= TD1,2= BTD1, 2= 0mA VPOL 1= VPOL 2= Don't Care F IN 1= F IN 2= Don't Care 100 14 5 9
LIMITS
Typ Max 8 12
UNITS
V mA
V POL1 and VPOL2 Inputs I POL V TPOL T SPOL VHOR HIGH VHOR LOW V POL1 = VPOL2 = 25V (Note 2) Current Threshold Voltage T amb =-40C to 80C Switching Speed HOR OUT 1 and HOR OUT 2 Outputs Voltage High Voltage Low IHOR OUT 1,2=-100 A,V POL 1,2=14.5V IHOR OUT 1,2=5mA,V POL 1,2=14V IBHOR OUT 1,2=-100 A,V POL 1,2=14.0V IBHOR OUT 1,2=5mA,V POL 1,2=14.5V V CC -1.0 VCC 0.7 V CC 0 0.30 0.5 V V 200 14.25 240 14.5 100 A V S
BHOR OUT 1 and BHOR OUT 2 Outputs VBHOR HIGH Voltage High VBHOR LOW Voltage Low Enable 1,2 Outputs VEN HIGH VEN LOW V OUT F inz AG FV T Voltage High Voltage Low Filter Amplifier Bias Voltage 3 Input Impedance Amplifier Gain V Threshold
3
V CC -1.0 VCC 0.7 V CC 0 0.30 0.5
V V
IEnable 1,2=-100 A,V POL 1,2=10V IEnable 1,2=500 A,V POL 1,2=8.0V I fin =0 V FIN =100mV p/p V FIN =100mV p/p
V CC -1.0 V CC 0.7 V CC 0 0.30 0.5
V V
1.75
1.95 150 30
2.15
V
V/mA 350 mV p/p
100
170
Note:1) The parameters Filter Amplifier VOUT, IOUT, 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 2
ZLNB2012
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated): Tamb= 25 C,VCC=5V
SYMBOL PARAMETER CONDITIONS Min TD 1,2 Outputs V VHIGH V VLOW Voltage high Voltage Low BTD 1,2 Outputs V VHIGH V VLOW Voltage high Voltage Low IBTD 1,2=-100 A, Test Circuit 1, Tone disabled IBTD 1,2=15mA, Test Circuit 1, Tone enabled V CC -1.0 V CC -0.7 0 0.3 V CC 0.5 V V ITD 1,2=-100 A, Test Circuit 1, Tone enabled ITD 1,2=15mA, Test Circuit 1, Tone disabled V CC -1.0 V CC -0.7 0 0.3 V CC 0.5 V V
LIMITS
Typ Max
UNITS
Note:1) The parameters Filter Amplifier VOUT, IOUT, 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 3
ZLNB2012
TEST CIRCUIT 1 (ZLNB2012 Pinout for QSOP16 package designator - Q16)
BTD2 TD2 BHOR2 HOR2 ENA2 10nF CF2 GND FIN2 VPOL2 RP2 1.0k
1
BTD1 TD1 BHOR1 HOR1 VCC ENA1 FIN1 VPOL1 RP1 1.0k 10nF CF1 V1 5V
V2 (See Note 1)
Note 1: V2 Characteristics Type:AC source Frequency:- 22kHz Voltage:300mVp/p Enabled Zero Disabled
Tone Input (V2)
TD Outputs
Switching Delays
PROVISIONAL ISSUE A - OCTOBER 2001 4
ZLNB2012
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
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
ZLNB2012 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
PROVISIONAL ISSUE A - OCTOBER 2001 5
ZLNB2012
APPLICATION CIRCUIT EXAMPLES
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).
BTD2 TD2 BHOR2 HOR2 ENA2 10nF CF2 GND FIN2 VPOL2
1
BTD1 TD1 BHOR1 HOR1 VCC ENA1 FIN1 VPOL1 CF1 10nF RP1 1.0k
Vcc
RP2 1.0k LNB Downfeed No.2
LNB Downfeed No.1
ZLNB2012 PINOUT FOR QSOP16 PACKAGE DESIGNATOR - Q16
ORDERING INFORMATION
Part Number ZLNB2012Q16 Package QSOP16 Part Mark ZLNB2012
1 BTD2 TD2 BHOR2 HOR2 ENA2 GND FIN2 VPOL2 BTD1 TD1 BHOR1 HOR1 VCC ENA1 FIN1 VPOL1
SAMPLE ORDERING INFORMATION
Part Number #ZLNB2012Q16 Package QSOP16 Part Mark ZLNB2012
PROVISIONAL ISSUE A - OCTOBER 2001 6
ZLNB2012
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, DiSEqCTM bursts and supply switching transients common when using DiSEqC-2TM 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:-
Tone Off Off On On -
Vpol 14V 14.5V 14V 14.5V <8V
TD Low Low High High -
BTD High High Low Low -
HOR Low High Low High Low
BHOR High Low High Low High
ENA High High High High Low
PROVISIONAL ISSUE A - OCTOBER 2001 7
ZLNB2012
PACKAGE DIMENSIONS
QSOP16
DIM Millimetres MIN A B C D E F G J K 4.80 0.635 0.23 REF 0.20 3.81 1.35 0.10 5.79 0 0.30 3.99 1.75 0.25 6.20 8 MAX 4.98 MIN 0.189 Inches MAX 0.196
0.025 NOM 0.009 REF 0.008 0.15 0.053 0.004 0.228 0 0.012 0.157 0.069 0.01 0.244 8
(c) Zetex plc 2001
Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 Zetex GmbH Streitfeldstrae 19 D-81673 Munchen 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 8

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