ZLNB2012 DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER DEVICE DESCRIPTION The ZLNB2012 dual polarisation and tone switch Universal LNB local oscillator selection is achieved by controller is one of a wide range of satellite receiver detection of a low level AC voltage superimposed on LNB support circuits available from Zetex. It features the polarisation control voltage. To facilitate this two completely independent channels, each providing function, the ZLNB2012 includes a separate tone logic outputs to control LNB polarisation selection, detector for each channel. Control of detector local oscillator selection and downfeed disable. It is bandwidth and sensitivity is provided using an intended for use in Twin, Quad and multiple feed external resistor and capacitor for each channel. The Universal LNBs, replacing many discrete components tone detector has been designed give excellent to save both manufacturing cost and PCB size whilst rejection of low frequency control signals and improving reliability. DiSEqC tone bursts. The two highly accurate polarisation control inputs of The ZLNB2012 has been specifically designed to the ZLNB2012 have a nominal threshold of 14.25V and minimise the solution cost whilst being flexible. The to meet the required demanding needs from some ZLNB2012 only requires two external components per broadcasters they have a switching range of 14.0V to channel to give full user control and functionality. The 14.5V. The threshold is temperature compensated to ZLNB2012 also includes complimentary outputs so minimise drift. Each features a low and stable input that it can directly drive many multiplexer ICs without current that enables transient protection to be the need of an inverter. Any unused outputs can be left achieved with the addition of only a single resistor per open circuit without any effect to the remaining circuits channel. operation Polarisation switch and tone detector outputs can directly drive TTL and CMOS logic, pin diodes, IF-amp supply switching and multiplexer ICs. Multi Feed LNBs can be called to operate with one or more of their controlling receivers powered down/disconnected, with attendant cable mismatch The ZLNB2012 operates from a single supply which problems. To ease design for this situation, each can be anything from 5-8V. Its quiescent current is polarisation input of the ZLNB2012 has a second typically only 9mA and this does not change threshold set at 9V. An input voltage below this significantly with load or logic state. It is available in the threshold indicates receiver not present, and space saving QSOP16 surface mount package. 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 Low frequency and DiSEqC control signals rejection Reduced Cost Solution, only 2 external components per channel Eliminates many close tolerance discrete 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 APPLICATIONS IF amp capable Twin Universal LNBs Transient resistant inputs Quad Universal LNBs Includes Receiver-Off detector Multi Feed Universal LNBs User adjustable filter centre frequency and LNB switch boxes bandwidth PROVISIONAL ISSUE A - OCTOBER 2001 1ZLNB2012 ABSOLUTE MAXIMUM RATINGS Power Dissipation (T amb 25 C) Supply Voltage -0.6V to 12V QSOP16 500mW Supply Current 500mA V and V POL1 POL2 Input Voltage 25V Continous Operating Temperature -40 to 80C Storage Temperature -40 to 85C ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated): T =5V amb= 25 C,VCC SYMBOL PARAMETER CONDITIONS UNITS LIMITS Min Typ Max V Supply Voltage 5 8 V CC I Supply Current HOR1,2= BHOR1,2= TD1,2= BTD1, 2= 0mA 912 mA CC V 1= V 2= Dont Care POL POL F 1= F 2= Dont Care IN IN V and V Inputs POL1 POL2 V =V = 25V (Note 2) I Current POL1 POL2 100 200 240 A POL V Threshold Voltage 14 14.25 14.5 V TPOL T =-40C to 80C amb T Switching Speed 100 S SPOL HOR 1 and HOR 2 Outputs OUT OUT VHOR Voltage High IHOR 1,2=-100 A,V 1,2=14.5V V -1.0 V 0.7 V V HIGH OUT POL CC CC CC VHOR Voltage Low IHOR 1,2=5mA,V 1,2=14V 0 0.30 0.5 V LOW OUT POL BHOR 1 and BHOR 2 Outputs OUT OUT VBHOR Voltage High IBHOR 1,2=-100 A,V 1,2=14.0V V -1.0 V 0.7 V V HIGH OUT POL CC CC CC VBHOR Voltage Low IBHOR 1,2=5mA,V 1,2=14.5V 0 0.30 0.5 V LOW OUT POL Enable 1,2 Outputs VEN Voltage High IEnable 1,2=-100 A,V 1,2=10V V -1.0 V 0.7 V V HIGH POL CC CC CC VEN Voltage Low IEnable 1,2=500 A,V 1,2=8.0V 0 0.30 0.5 V LOW POL Filter Amplifier 3 V Bias Voltage I =0 1.75 1.95 2.15 V OUT fin F Input Impedance V =100mV p/p 150 inz FIN AG Amplifier Gain V =100mV p/p 30 V/mA FIN 3 FV V Threshold 100 170 350 mV T 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