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AUTOMOTIVE AND HOUSEHOLD SECURITY SIREN DRIVER
ISSUE 6 - JANUARY 1998 INTRODUCTION
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.
ZSD100
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 - 1A sleep mode Low cost 8 pin DIL & SO packages. User selected audio and sweep frequencies. -40C to 125C 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 Oscillator Output C OUT Q Q
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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 SAW
Low Frequency Oscillator Output Driver Control Voltage Audio Voltage Controlled Oscillator Oscillator Output C OUT Q Q
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. 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. An external capacitor is used to program the low frequency modulating oscillator. The value of CMOD recommended is between 0.1F and 100F.
2.
SAW
3.
CMOD
4. 5.
GND COUT An external capacitor is used to program the output oscillator. The value of COUT recommended is between 1nF and 100nF. Non inverted output driver Inverted output driver
6. 7. 8.
Q Q VCC
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ZSD100
ABSOLUTE MAXIMUM RATING
Vcc Operating Temperature Storage Temperature -0.5V to +20V -40 to 125C -65 to 150C Power Dissipation (Tamb=25C) SO8 DIL8 625mW 625mW
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tamb=25C, VCC=12V
PARAMETER SYMBOL MIN. 4V TYP. MAX. 18V CONDITIONS.
Supply Voltage Operating VCC Range Supply Current Disabled Enabled Modulating Oscillator Frequency Range
Frequency Value See Note 1 ICC
1A 25mA
RT O/C, VCC=18V RT, Q, Q at Gnd, VCC=18V
FMOD FMOD
0.1Hz 3.3Hz 5.1Hz 4.3Hz 5.5Hz
10Hz 5.4Hz 5.9Hz
VCC=4 to 18V RT=0, CMOD=10F RT=470k, CMOD=1F
Output Oscillator Frequency Range
FOUT
100Hz 1.01kHz
10kHz
VCC=4 to 18V
Centre Frequency ( Note 2) FOUT FOUT Deviation Duty Cycle
1.26kHz 1.58kHz RT=0, COUT=22nF 33% 55% 49%
Output Source Current Sink Current Open Circuit Voltage
ISOURCE 5mA 0.5mA ISINK VOUT(HIGH) VCC-1.5V VOUT(LOW)
0.5V
VOUT=1.4V VOUT=1.4V IOUT=100A ISINK=0.1A
Frequency Control Components Internal Resistor External Resistor Modulation Capacitor Output Capacitor
Note 1. Note 2.
RT (INT) RT (EXT) CMOD COUT
61.5k 0 0.1F 1nF 1M 100F 100nF CMOD in F, RT (EXT) in k COUT in F, RT (EXT) in k
2850 Hz CMOD(61.5+RT (EXT) ) 1710 FOUT = Hz COUT(61.5+RT (EXT) )
FMOD =
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ZSD100
TYPICAL CHARACTERISTICS
20
ISOURCE - Output Source Current (mA)
ISINK - Output Sink Current (mA)
VCC =12V
10
Q
VCC =12V
16
8 Q or Q 6 4
12 8 Q
4 0 0 2 4 6 8 10
2
0 0 2 4 6 8 10 12
VOUT - Output Voltage (V)
VOUT - Output Voltage (V)
ISINK vVOUT
ISOURCE vVOUT
FMOD - Normalised Modulation Frequency
1.2
FO - Normalised Output Frequency
RT=470k
1.2 RT=0 1.0 RT=470k
1.0
RT=0
0.8 0.6
0.8
0.6 FO at VCC =12V = 1.4kHz 0.4 0.2 0 4 8 12 16 20
0.4
0.2 0 4 8 12 16 20
VCC - Supply Voltage (V)
VCC - Supply Voltage (V)
FMOD vVCC
FO vVCC
FOUT - Output Centre Frequency (kHz)
10
FMOD - Modulation Frequency (Hz)
10
RT=0
RT=0 1.0
1.0
RT=470k 0.1 1.0 10 100
RT=470k 0.1 1 10 100
COUT - Output Oscillator Capacitance (nF)
CMOD - Modulation Capacitance (F)
FOUT vCOUT
FMOD v CMOD
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ZSD100
TYPICAL CHARACTERISTICS
PDIS - Maximum Power Dissipation (mW)
10
800 700 600 500 400 300 200 100 0 -50 -25 0 25 50 75 100 125
IQ - Quiescent Current (mA)
8
CMOD=10F COUT=22nF Q,Q O/C
6
4
RT=0 RT =470K
2
0 0 4 8 12 16 20
VCC - Supply Voltage (V)
TAMB - Ambient Temperature (C)
IQ v VCC
Derating Curve
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ZSD100
APPLICATIONS CIRCUITS Piezo Sounder
+12V ZSD100
RT SAW C MOD G ND VCC
_
Q Q C OUT
T1
Piezo Sounder
ZTX 605
C MOD
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 ZSD100
RT SAW C MOD G ND VCC
ZTX 790A _ ZTX 790A MPS 2222 MPS 2222 330 330
6
Q Q C OUT
SPEAKER ZTX 690B ZTX 690B 0V
C MOD
C OUT
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.
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ZSD100
Improved Frequency Control
VCC ZSD100
RT SAW VCC
_
Q Q C OUT
RT
C MOD G ND
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 ZSD100 LOGIC
Open collector output
VCC
RT SAW C MOD GND
VCC
_
Q Q 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.
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ZSD100
CONNECTION DIAGRAMS
SO8 Package Suffix - N8 DIL8 Package Suffix - D8
Top View
Top View
ORDERING INFORMATION
Part Number ZSD100D8 ZSD100N8 Package DIL8 SO8 Part Mark ZSD100 ZSD100
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