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. 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 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. 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. 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. 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 * Low frequency and DiSEqC rejection * Dual polarisation and tone switch * Reduced Cost Solution, only 2 external components per channel 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 * Close tolerance (14-14.5V) and temperature compensated polarisation switch * Wide supply operating range * Multiplexer IC direct drive * Low quiescent current * Tone and pol. Outputs are TTL, CMOS, Pin diode and IF amp capable APPLICATIONS * Twin Universal LNB's * Transient resistant inputs * Quad Universal LNB's * Includes Receiver-Off detector * Multi Feed Universal LNB's * User adjustable filter centre frequency and bandwidth * LNB switch boxes PROVISIONAL ISSUE A - OCTOBER 2001 1 ZLNB2012 ABSOLUTE MAXIMUM RATINGS Supply Voltage -0.6V to 12V Supply Current 500mA Power Dissipation (Tamb 25 C) QSOP16 500mW VPOL1 and VPOL2 Input Voltage 25V Continous Operating Temperature -40 to 80C Storage Temperature -40 to 85C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated): Tamb= 25C,VCC=5V SYMBOL PARAMETER CONDITIONS Min V CC Supply Voltage I CC Supply Current UNITS LIMITS Typ 5 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 Max 8 V 9 12 mA 200 14.25 240 14.5 100 A V S V POL1 and VPOL2 Inputs I POL V TPOL T SPOL V POL1 = VPOL2 = 25V (Note 2) Current Threshold Voltage T amb =-40C to 80C Switching Speed VHOR HIGH VHOR LOW Voltage High Voltage Low 100 14 HOR OUT 1 and HOR OUT 2 Outputs IHOR OUT 1,2=-100A,V POL 1,2=14.5V IHOR OUT 1,2=5mA,V POL 1,2=14V V CC -1.0 VCC 0.7 V CC 0 0.30 0.5 V V IBHOR OUT 1,2=-100A,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 IEnable 1,2=-100A,V POL 1,2=10V IEnable 1,2=500A,V POL 1,2=8.0V V CC -1.0 V CC 0.7 V CC 0 0.30 0.5 V V 1.75 BHOR OUT 1 and BHOR OUT 2 Outputs VBHOR HIGH Voltage High VBHOR LOW Voltage Low Enable 1,2 Outputs VEN HIGH VEN LOW Voltage High Voltage Low Filter Amplifier V OUT Bias Voltage 3 I fin =0 F inz Input Impedance V FIN =100mV p/p 150 AG Amplifier Gain V FIN =100mV p/p 30 V/mA FV T V Threshold 3 100 1.95 170 2.15 350 V mV p/p 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= 25C,VCC=5V SYMBOL PARAMETER CONDITIONS UNITS LIMITS Min Typ Max TD 1,2 Outputs V VHIGH Voltage high ITD 1,2=-100A, Test Circuit 1, Tone enabled V CC -1.0 V CC -0.7 V CC V V VLOW Voltage Low ITD 1,2=15mA, Test Circuit 1, Tone disabled 0 0.5 V 0.3 BTD 1,2 Outputs V VHIGH Voltage high IBTD 1,2=-100A, Test Circuit 1, Tone disabled V CC -1.0 V CC -0.7 V CC V V VLOW Voltage Low IBTD 1,2=15mA, Test Circuit 1, Tone enabled 0 0.5 V 0.3 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 10nF CF2 1 BTD1 TD2 TD1 BHOR2 BHOR1 HOR2 HOR1 ENA2 VCC GND ENA1 FIN2 FIN1 VPOL2 VPOL1 V1 5V 10nF CF1 RP2 1.0k RP1 1.0k 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 Additionally the front end bias requirements of the LNB are provided by the ZNBG4000 or ZNBG6000 offering a very efficient and cost effective solution 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. Horizontal Gain Stage GaAs/HEMTFET Antenna 1 3 High Band Control Input <=13V-Horizontal >=14.5V-Vertical + DC Input 13-25V High Band Horizontal Mixer Low Band Horizontal + H/V Output 1 Bias Generator ZNBG40XX Series ZLNB2012 Series Dual H/V Switch & 22kHz Switch High Band ASTRA 10.95 GHz-11.7 GHz Standard Band 10.7 GHz-11.8 GHz Enhanced Band Low Band Low Band Control PIN Diode MUX IF down feed 950-1750 MHz - Standard Band 950-2050 MHz - Enhanced Band High Band + 2 Vertical Antenna 4 Gain Stage GaAs/HEMTFET High Band Vertical Mixer Low Band Vertical + Low Band PROVISIONAL ISSUE A - OCTOBER 2001 5 H/V Output 2 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 RP2 1.0k 10nF CF2 1 BTD1 TD2 TD1 BHOR2 BHOR1 HOR2 HOR1 ENA2 VCC GND ENA1 FIN2 FIN1 VPOL2 VPOL1 Vcc 10nF CF1 RP1 1.0k LNB Downfeed No.2 LNB Downfeed No.1 ORDERING INFORMATION ZLNB2012 PINOUT FOR QSOP16 PACKAGE DESIGNATOR - Q16 1 BTD2 BTD1 TD2 TD1 BHOR2 BHOR1 HOR2 HOR1 ENA2 VCC GND ENA1 FIN2 FIN1 VPOL2 VPOL1 Part Number Package Part Mark ZLNB2012Q16 QSOP16 ZLNB2012 SAMPLE ORDERING INFORMATION Part Number Package Part Mark #ZLNB2012Q16 QSOP16 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 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. 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. 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 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 PROVISIONAL ISSUE A - OCTOBER 2001 7 ZLNB2012 PACKAGE DIMENSIONS QSOP16 DIM A Millimetres Inches MIN MAX MIN MAX 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 K 0 8 0 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 Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 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