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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 ease design for this situation, each polarisation input of the zlnb200x has a second threshold set at 9.5v. an input voltage below this threshold indicates "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 81 ZLNB2001 zlnb2002 zlnb2003 zlnb2004
absolute maximum ratings supply voltage -0.6v to 12v supply current 100ma v pol1 and v pol2 input voltage 25v continuous operating temperature -40 to 70c storage temperature -40 to 85 power dissipation (t amb = 25c) qsop16 500mw 82 electrical characteristics test conditions (unless otherwise stated): t amb = 25c,v cc =5v,i d =10ma (r cal1 =33k?) symbol parameter conditions limits units min typ max v cc supply voltage 5 10 v i cc supply current ihv out1,2 =it out1,2 =0 it out1,2 =0,ihv out1,2 =10ma, v pol =15.5v 5.5 26 12 32 ma ma v pol1 and v pol2 inputs i pol current v pol1 = v pol2 = 25v (note 2) 10 25 40 a v tpol threshold voltage t amb =-40c to 70c (note 2) 14.0 14.75 15.5 v t spol switching speed 100 s ihv out1 and ihv out2 outputs vhv high voltage high ihv out1,2 =-20 a,v pol1,2 = 15.5v v cc -0.2 v cc -0.1 v cc v vhv high voltage high ihvout1,2=-10 a,v pol1,2 = 15.5v v cc -1.0 v cc -0.9 v cc v vhv low voltage low ihv out1,2 =-10 a,v pol1,2 = 14v 0 0.29 0.5 v enable 1,2 outputs ven high voltage high ienable1,2=-100 a,v pol1,2 = 10v v cc -1.0 v cc -0.75 v cc v ven high voltage high ienable1,2=20 a,v pol1,2 = 8.0v 00.14v cc v ven low voltage low ienable1,2=500 a,v pol1,2 =8.0v 0 0.25 0.5 v filter amplifier i b input bias current rf1=150k 0.02 0.07 0.25 a v out v out (note 1) rf1=150k 1.75 1.95 2.15 v i out i out (note 1) vout=1.96v, vfin=2.1v 400 520 650 a g v voltage gain f=22khz, vin=1mv 0 46 db rectifier (zlnb2003 and zlnb2004 only) v rec vout (note 1) rf1=150k, il=10 a 1.8 2.0 2.2 v ileakage rf1=150k, vout=3v (note 1) 20 200 na ZLNB2001 zlnb2002 zlnb2003 zlnb2004
symbol parameter limits units min typ max comparator (zlnb2003 and zlnb2004 only) v th threshold (note 1) f=0 2.95 3.2 3.45 v v vhigh v vhigh v vlow tout 1/2 outputs voltage high voltage high voltage low itout1,2=-20 a, test circuit 1, tone enabled itout1,2=-10ma, test circuit 1, tone enabled itout1,2=10ma, test circuit 1, tone disabled v cc -0.2 v cc -1.0 0 v cc -0.1 v cc -0.9 0.29 v cc v cc 0.5 v v v 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 electrical characteristics test conditions (unless otherwise stated): t amb = 25 c,v cc =5v,i d =10ma (r cal1 =33k?) ZLNB2001 zlnb2002 zlnb2003 zlnb2004 83
v1 5v v2 + + - - f in1 f in2 g nd f out1 f out2 v pol1 v pol2 ZLNB2001 zlnb2002 v cc 68pf 470pf c2 68pf c4 470pf c3 c1 r2 150k r1 10k (see note 1) r3 10k r4 150k v2 + + - - f in1 f in2 g nd f out1 f out2 v pol1 v pol2 zlnb2003 zlnb2004 v cc c rec1 c rec2 68pf c4 470pf c3 68pf 470pf c2 c1 r2 150k r1 10k (see note 1) r3 10k r4 150k v1 5v c5 100nf r5 1m r6 1m c6 100nf ZLNB2001 zlnb2002 zlnb2003 zlnb2004 test circuit 1 test circuit 2 84
filter response 100 1k 10k 100k 1m 0 0.2 0.4 0.6 0.8 1.0 frequency (hz) fout voltage (vp/p) 1.2 1.4 open loop phase v frequency 100 1k 10k 100k 1m 0 30 60 90 120 frequency (hz) open loop phase (degrees) 150 180 10m hv/tout voltage high v load current 02468 4.2 4.4 4.6 load current (ma) hv/tout voltage high (v) 4.8 10 4.0 5.0 hv/tout voltage low v load current 02468 0 0.1 0.2 load current (ma) hv/tout voltage low (v) 0.3 10 0.4 open loop gain v frequency 100 1k 10k 100k 1m 0 10 20 30 40 frequency (hz) open loop gain (db) 50 60 70 10m vcc = 5v vin=0.1vp/p test circ. 1 vcc = 5v vcc = 5v ta mb = -4 0 c ta mb = 2 5 c ta mb = 7 0 c vcc = 5v tam b = -4 0 c tam b = 25 c tam b = 70 c vcc = 5v typical characteristics ZLNB2001 zlnb2002 zlnb2003 zlnb2004 85
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. bias generator znbg40xx series zlnb20xx series dual h/v switch & 22khz switch vertical antenna horizontal antenna gain stage gaas/hemtfet gain stage gaas/hemtfet 1 4 2 if down feed 950-1750 mhz - standard band 950-2050 mhz - enhanced band h/v output 2 h/v output 1 3 control input <=13v-horizontal >=14.5v-vertical control high band horizontal low band horizontal high band vertical low band vertical pin diode mux dc input 13-25v astra 10.95 ghz-11.7 ghz standard band 10.7 ghz-11.8 ghz enhanced band + + mixer + + mixer low band low b an d low band high band h ig h b and high band ZLNB2001 zlnb2002 zlnb2003 zlnb2004 86
f in1 f in2 g nd f out1 f out2 v pol1 v pol2 ZLNB2001 v cc v cc 68pf 470pf c2 68pf c4 470pf c3 c1 r2 150k r1 10k r3 10k r4 150k lnb downfeed no.1 lnb downfeed no.2 f in1 f in2 g nd f out1 f out2 v pol1 v pol2 zlnb2003 v cc c rec1 c rec2 68pf c4 470pf c3 68pf 470pf c2 c1 r2 150k r1 10k r3 10k r4 150k c5 100nf r5 1m r6 1m c6 100nf v cc lnb downfeed no.1 lnb downfeed no.2 ZLNB2001 zlnb2002 zlnb2003 zlnb2004 the following circuit shows the additional components that will be used for polarisation mode and 22khz tone detection in a typical ZLNB2001/2 application. the following circuit shows the additional components that will be used for polarisation mode and 22khz tone detection in a typical zlnb2003/4 application. application circuit examples 88
further information 1) inputs v pol1 and v pol2 are designed to be wired to the power inputs of an lnb via high value (10k) resistors. input v pol1 controls outputs hvout1 and enable1. input v pol2 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 voltage at or above 15.5v, the corresponding hvout pin will be active. should the voltage applied to either v pol 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 v pol 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 high. pins crec1 and crec2 make accessible the outputs of the tone switch rectifiers and provides a means of controlling tone switch delays. significant switching delays may be necessary to avoid incorrect operation in the presence of unwanted interference (e.g. switching tones intended for other signalling systems). for correct 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 approximately 0.2cr seconds. 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 87
tone detection function fin1 fin2 tout 1 tout 2 ZLNB2001/3 22khz 22khz high high --l o wl o w zlnb2002/4 22khz 22khz high high --l o wl o w v pol1 v pol2 hv out1 hv out2 enable 1 /2 ZLNB2001/3 <=14v <=14v low low high >=15.5v >=15.5v high high high zlnb2002/4 <=14v <=14v high high high >=15.5v >=15.5v low low high ZLNB2001,2,3,4 <=8v <=8v - - low ZLNB2001 zlnb2002 zlnb2003 zlnb2004 89
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 zlnb2003 qsop16 package suffix - q16 top view applies to zlnb2004 ZLNB2001 zlnb2002 zlnb2003 zlnb2004 connection diagrams ordering information part number package part mark ZLNB2001q16 qsop16 ZLNB2001 zlnb2002q16 qsop16 zlnb2002 zlnb2003q16 qsop16 zlnb2003 zlnb2004q16 qsop16 zlnb2004 90
ZLNB2001 zlnb2002 zlnb2003 zlnb2004 pin no.1 identification recess for pin 1 a b d j e f g c k qsop16 dim millimetres inches min max min max a 4.80 4.98 0.189 0.196 b 0.635 0.025 nom c 0.177 0.267 0.007 0.011 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 k0 8 0 8 91 package dimensions
dim millimetres inches min max min max a 0.91 1.11 0.036 0.044 a1 0.10 0.20 0.004 0.008 b 0.25 0.36 0.010 0.014 c 0.13 0.18 0.005 0.007 d 2.95 3.05 0.116 0.120 e 0.65 nom 0.0256 nom e1 0.33 nom 0.0128 nom e 2.95 3.05 0.116 0.120 h 4.78 5.03 0.188 0.198 l 0.41 0.66 0.016 0.026 0 6 0 6 dim millimetres inches min max min max a 4.80 4.98 0.189 0.196 b 1.27 bsc 0.05 bsc c 0.53 ref 0.02 ref d 0.36 0.46 0.014 0.018 e 3.81 3.99 0.15 0.157 f 1.35 1.75 0.05 0.07 g 0.10 0.25 0.004 0.010 j 5.80 6.20 0.23 0.24 k0 8 0 8 l 0.41 1.27 0.016 0.050 msop8 so8 ZLNB2001 zlnb2002 zlnb2003 zlnb2004 83

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