issue 8 - june 2007 ? zetex semiconductors plc 200 7 automotive and household security siren driver issue 8 C june 200 7 introduction the zsd100 is a frequency swept alarm signal generator designed specifically for static and automotive security alarm systems. one zsd100, two timing capacitors, an in-expensive to92 darlington, piezo transducer and coupling transformer is all that is necessary to produce an ear piercing 120 db alarm siren. including an audio frequency signal generator, low frequency sweep generator, disable circuitry and output driver stages, the zsd100 provides every function necessary to produce a standard alarm signal. available in an 8 pin so package, t he ic gives a low cost compact solution to siren signal generation. the device operates from supplies of 4v up to 18v and is ideal for security alarms in battery p owered applications, burglar alarms and automotive anti theft systems. features 4-18v operating voltage range. small external component count. direct drive of darlington, mosfet and igbt output stages. single ended or push-pull output stages. suitable for automotive and static alarm systems. low supply current - 10ma operating - 1 m a sleep mode low cost 8 pin so package . user selected audio and sweep frequencies. -40c to 125c operating temperature range. choice of modulation waveform. zsd100 low frequency oscillator output driver q oscillator output control voltage audio voltage controlled oscil lator saw c r r (int) q t t mod c ou t schematic diagram
issue 8 - june 2007 www.zetex .com ? zetex semiconductors plc 200 7 zsd100 low frequency oscillator output driver q oscillator output control voltage audio voltage controlled oscillator saw c r r (int) q t t mod c out pin descriptions 1. r t optional external resistor for improved frequency control. an external resistor improves the control of both the modulating and output oscillators. the r t pin is also used to power the device down. either connecting r t to v cc or an open circuit will result in the device being disabled. 2. saw selection of modulation waveform is made using the saw pin. an open circuit produces a triangle wave, sawtooth is achieved by connecting saw to the c mod pin. 3. c mod an external capacitor is used to program the low frequency modulating oscillator. the value of c mod recommended is between 0.1 m f and 10 0m f. 4. g nd 5. c out an external capacitor is used to program the output oscillator. the value of c out recommended is between 1nf and 100nf. 6. q non inverted output driver 7. q inverted output driver 8. v cc functional description the audio signal of the zsd100 is generated using a squarewave oscillator whose output is capable of directly driving a wide range of output circuits. to produce a characteristic alarm siren sound, the frequency of the audio oscillator is swept over a fixed 2:1 range by a second, low frequency oscillator. the freqencies of both oscillators are controlled by r t (int) and capacitors c mod and c out .
issue 8 - june 2007 www.zetex .com ? zetex semiconductors plc 200 7 zsd100 electrical characteristics test conditions (unless otherwise stated):t amb =25c, v cc =12v parameter symbol min. typ. max. conditions. supply voltage operating range v cc 4v 18v supply current disabled enabled i cc 1 m a 25ma r t o/c, v cc =18v r t , q, q at gnd, v cc =18v modulating oscillator frequency range f mod 0.1hz 10hz v cc =4 to 18v frequency value see note 1 f mod 3.3hz 5.1hz 4.3hz 5.5hz 5.4hz 5.9hz r t =0, c mod =10 m f r t =470k w , c mod =1m f output oscillator frequency range centre frequency ( note 2) deviation duty cycle f out 100hz 10khz v cc =4 to 18v f out d f out 1.01khz 1.26khz 33% 49% 1.58khz 55% r t =0, c out =22nf output source current sink current open circuit voltage i source i sink v out(high) v out(low) 5ma 0.5ma v cc -1.5v 0.5v v out =1.4v v out =1.4v i out =100 m a i sink =0.1 m a frequency control components internal resistor external resistor modulation capacitor output capacitor r t (int) r t (ext) c mod c out 0 0.1 m f 1nf 61.5k w 1m w 100 m f 100nf note 1. f mod = 2850 c mod ( 61.5 + r t ( ext ) ) hz c mod in m f, r t (ext) in k w note 2. f out = 1710 c out ( 61.5 + r t ( ext ) ) hz c out in m f, r t (ext) in k w absolute maximum rating v cc -0.5v to +20v operating temperature -40 to 125c storage temperature -65 to 150c power dissipation (t amb =25c) so8 625mw
issue 8 - june 2007 w ww.zetex.com ? zetex semiconductors plc 200 7 zsd100 f mod - modulation frequency (hz) f mod - normalised modulation frequency 0 246 8 10 20 16 12 8 4 0 v =12v cc q q v out - output voltage (v) i sink - output sink current (ma) i sink v v out typical characteristics 0 2 4 6 8 10 10 8 6 4 2 0 12 q or q v out - output voltage (v) i source v v out i source - output source current (ma) 0 4812 16 20 1.2 1.0 0.8 0.6 0.4 0.2 r t =470k r t =0 v cc - supply voltage (v) f mod vv cc 0 4812 16 20 1.2 1.0 0.8 0.6 0.4 0.2 f o at v cc =12v = 1.4khz r t =470k r t =0 v cc - supply voltage (v) f o vv cc f o - normalised output frequency c out - output oscillator capacitance (nf) f out vc out c mod - modulation capacitance ( m f) f mod v c mod f out - output centre frequency (khz) 1.0 10 100 10 1.0 0.1 110 100 10 1.0 0.1 r t =470k r t =0 r t =470k r t =0 v =12v cc
issue 8 - june 2007 www.zetex.com ? zetex semiconductors plc 200 7 -50 -25 0 25 50 75 100 125 800 700 600 500 400 300 200 100 0 t amb - ambient temperature (c) p dis - maximum power dissipation (mw) derating curve r =0 t r =470k t c mod =10 m f c out =22nf q,q o/c 0 4812 16 20 10 8 6 4 2 0 v cc - supply voltage (v) i q - quiescent current (ma) i q v v cc typical characteristics zsd100
issue 8 - june 2007 www.zetex .com ? zetex semiconductors plc 200 7 zsd100 applications circuits piezo sounder utilizing a standard autotransformer driven piezo sounder, this circuit indicates a minimum component count alarm solution. in this configuration a ztx605 darlington transistor can be connected directly to the ouput of the ic without the need for base resistors. moving coil loudspeaker sounder moving coil loudspeakers are often used for the very highest output automotive alarm sounders. the zsd100 complementary outputs, with the selection of ztx790a and ztx690b transistors, can drive this h bridge ouput circuit without any additional interface components. t mod nd cc out _ v q q c r saw c g zsd100 c out c mod 0v +12v ztx 605 t1 piezo sounder t mod nd cc out _ v q q c r saw c g zsd100 c out c mod mps 2222 330 330 mps 2222 ztx 690b ztx 790a ztx 790a ztx 690b speaker 6w 0v +12v
issue 8 - june 2007 www.zetex .com ? zetex semiconductors plc 200 7 zsd100 improved frequency control improved frequency control can be achieved with an external resistor between the r t pin and g nd . an external resistor reduces the value of the timing capacitors required for the selected operating frequency and also reduces the zsd100s power consumption. note: the outputs of the zsd100 have been designed to avoid cross-conduction in full bridge output circuits. large value external timing resistors can lead to a small level of cross-conduction. it is recommended that external timing resistors are not used with bridge output circuits. remote switching if the r t pin is switched open-circuit, all internal functions of the ic are shut down. note: a small leakage current in the open collector logic controller will enable the ic. if such leakage cannot be eliminated, its effect can be easily negated by adding a high value resistor (eg. 100k) between pin r t and v cc . this resistor will have no effect on frequency control. t mod nd cc out _ v q q c r saw c g zsd100 c out c mod t r g v nd cc t mod nd cc out _ v q q c r saw c g zsd100 c mod logic open collector output logic supply c out g nd v cc
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