AUTOMOTIVE AND HOUSEHOLD SECURITY SIREN DRIVER ZSD100 ISSUE 6 – JANUARY 1998 INTRODUCTION FEATURES The ZSD100 is a frequency swept alarm signal generator designed specifically for static and automotive security alarm s y st e ms . On e Z SD 1 0 0 , t w o t i mi n g 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 either an 8 pin DIL or SO package the 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 powered applications, burglar alarms and automotive anti theft systems. • • • • • • • 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 - 1µA sleep mode Low cost 8 pin DIL & SO packages. User selected audio and sweep frequencies. -40°C to 125°C operating temperature range. Choice of modulation waveform. SCHEMATIC DIAGRAM R T (INT) RT C MOD SAW Low Frequency Oscillator Output Driver Control Voltage Audio Voltage Controlled Oscillator Q Q Oscillator Output C OUT 4-321 ZSD100 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 RT(INT) and capacitors CMOD and COUT . R T (INT) RT C MOD Low Frequency Oscillator SAW Output Driver Control Voltage Audio Voltage Controlled Oscillator Q Q Oscillator Output C OUT PIN DESCRIPTIONS 1. RT Optional external resistor for improved frequency control. An external resistor improves the control of both the modulating and output oscillators. The RT pin is also used to power the device down. Either connecting RT to VCC 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 CMOD pin. 3. CMOD An external capacitor is used to program the low frequency modulating oscillator. The value of CMOD recommended is between 0.1µF and 100µF. 4. GND 5. COUT An external capacitor is used to program the output oscillator. The value of COUT recommended is between 1nF and 100nF. 6. Q Non inverted output driver 7. Q Inverted output driver 8. VCC 4-322 ZSD100 ABSOLUTE MAXIMUM RATING Power Dissipation (Tamb=25°C) Vcc Operating Temperature Storage Temperature SO8 DIL8 -0.5V to +20V -40 to 125°C -65 to 150°C 625mW 625mW ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tamb=25°C, VCC=12V PARAMETER SYMBOL Supply Voltage Operating VCC Range Supply Current Disabled Enabled Modulating Oscillator Frequency Range Frequency Value MIN. TYP. 4V MAX. CONDITIONS. 18V ICC FMOD 0.1Hz FMOD 3.3Hz 5.1Hz FOUT 100Hz 4.3Hz 5.5Hz 1µA 25mA RT O/C, VCC=18V RT, Q, Q at Gnd, VCC=18V 10Hz VCC=4 to 18V 5.4Hz 5.9Hz RT=0, CMOD=10µF RT=470kΩ, CMOD=1µF 10kHz VCC=4 to 18V See Note 1 Output Oscillator Frequency Range Centre Frequency ( Note 2) FOUT ∆FOUT Deviation Duty Cycle Output Source Current Sink Current Open Circuit Voltage Frequency Control Components Internal Resistor External Resistor Modulation Capacitor Output Capacitor Note 1. Note 2. 1.01kHz 1.26kHz 1.58kHz RT=0, COUT=22nF ±33% 55% 49% ISOURCE 5mA 0.5mA ISINK VOUT(HIGH) VCC-1.5V VOUT(LOW) RT (INT) RT (EXT) CMOD COUT 0.5V VOUT=1.4V VOUT=1.4V IOUT=100µA ISINK=0.1µA 61.5kΩ 0 0.1µF 1nF 2850 Hz CMOD(61.5+RT (EXT) ) 1710 FOUT = Hz COUT(61.5+RT (EXT) ) FMOD = 1MΩ 100µF 100nF CMOD in µF, RT (EXT) in kΩ COUT in µF, RT (EXT) in kΩ 4-323 ZSD100 20 VCC =12V ISOURCE - Output Source Current (mA) ISINK - Output Sink Current (mA) TYPICAL CHARACTERISTICS Q 16 12 Q 8 4 0 0 2 4 6 8 10 10 VCC =12V 8 Q or Q 6 4 2 0 0 4 2 VOUT - Output Voltage (V) FO - Normalised Output Frequency FMOD - Normalised Modulation Frequency RT=470k RT=0 0.8 0.6 0.4 0.2 4 8 12 16 20 RT=0 1.0 RT=470k 0.8 0.6 FO at VCC =12V = 1.4kHz 0.4 0.2 0 8 12 16 20 FO vVCC FMOD - Modulation Frequency (Hz) FOUT - Output Centre Frequency (kHz) 4 VCC - Supply Voltage (V) FMOD vVCC 10 RT=0 1.0 RT=470k 0.1 10 12 1.2 VCC - Supply Voltage (V) 1.0 10 ISOURCE vVOUT 1.2 0 8 VOUT - Output Voltage (V) ISINK vVOUT 1.0 6 100 10 RT=0 1.0 RT=470k 0.1 1 10 CMOD - Modulation Capacitance (µF) COUT - Output Oscillator Capacitance (nF) FOUT vCOUT FMOD v CMOD 4-324 100 ZSD100 PDIS - Maximum Power Dissipation (mW) TYPICAL CHARACTERISTICS IQ - Quiescent Current (mA) 10 CMOD=10µF COUT=22nF Q,Q O/C 8 6 RT=0 4 RT =470K 2 0 0 4 8 12 16 20 VCC - Supply Voltage (V) 800 700 600 500 400 300 200 100 0 -50 -25 0 25 50 75 Derating Curve IQ v VCC 4-325 100 TAMB - Ambient Temperature (°C) 125 ZSD100 APPLICATIONS CIRCUITS Piezo Sounder +12V ZSD100 RT VCC SAW Q C MOD Q G ND ZTX 605 C OUT C MOD Piezo Sounder T1 _ C OUT 0V 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 +12V ZTX 790A ZSD100 RT ZTX 790A VCC _ SAW C MOD G ND MPS 2222 Q MPS 2222 Q 330 C OUT 330 C MOD 6Ω SPEAKER ZTX 690B ZTX 690B C OUT 0V 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. 4-326 ZSD100 Improved Frequency Control VCC ZSD100 RT VCC _ SAW Q C MOD Q RT G ND C OUT C MOD C OUT GND Improved frequency control can be achieved with an external resistor between the RT pin and GND. An external resistor reduces the value of the timing capacitors required for the selected operating frequency and also reduces the ZSD100’s 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 RT pin is switched open-circuit, all internal functions of the IC are shut down. Logic supply VCC ZSD100 LOGIC Open collector output RT VCC _ SAW Q C MOD Q GND C OUT C MOD C OUT GND 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 RT and VCC. This resistor will have no effect on frequency control. 4-327 ZSD100 CONNECTION DIAGRAMS SO8 Package Suffix – N8 DIL8 Top View Top View ORDERING INFORMATION Part Number Package Part Mark ZSD100D8 DIL8 ZSD100 ZSD100N8 SO8 ZSD100 4-328 Package Suffix – D8