DIODES ZSD100N8

AUTOMOTIVE AND HOUSEHOLD
SECURITY SIREN DRIVER
ZSD100
ISSUE 8 – JUNE 2007
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.
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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,
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 SO package.
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
Issue 8 - June 2007
© Zetex Semiconductors plc 2007
Q
Q
Oscillator
Output
C OUT
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
Issue 8 - June 2007
© Zetex Semiconductors plc 2007
www.zetex.com
ZSD100
Power Dissipation (Tamb=25°C)
ABSOLUTE MAXIMUM RATING
Vcc
Operating Temperature
Storage Temperature
-0.5V to +20V
-40 to 125°C
-65 to 150°C
SO8
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
ISOURCE
5mA
0.5mA
ISINK
VOUT(HIGH) VCC-1.5V
VOUT(LOW)
RT (INT)
RT (EXT)
CMOD
COUT
Issue 8 - June 2007
© Zetex Semiconductors plc 2007
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 =
1.26kHz 1.58kHz RT=0, COUT=22nF
±33%
55%
49%
1MΩ
100µF
100nF
CMOD in µF, RT (EXT) in kΩ
COUT in µF, RT (EXT) in kΩ
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ZSD100
20
VCC =12V
Q
16
12
Q
8
4
0
0
2
4
6
8
10
ISOURCE - Output Source Current (mA)
ISINK - Output Sink Current (mA)
TYPICAL CHARACTERISTICS
10
VCC =12V
8
Q or Q
6
4
2
0
0
4
2
VOUT - Output Voltage (V)
RT=0
0.8
0.6
0.4
0.2
8
12
16
20
FO - Normalised Output Frequency
FMOD - Normalised Modulation Frequency
RT=470k
4
RT=0
1.0
RT=470k
0.8
0.6
FO at VCC =12V = 1.4kHz
0.4
0.2
0
1.0
RT=470k
0.1
100
COUT - Output Oscillator Capacitance (nF)
© Zetex Semiconductors plc 2007
FMOD - Modulation Frequency (Hz)
FOUT - Output Centre Frequency (kHz)
RT=0
Issue 8 - June 2007
8
12
16
20
FO vVCC
10
FOUT vCOUT
4
VCC - Supply Voltage (V)
FMOD vVCC
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
10
RT=0
1.0
RT=470k
0.1
1
100
10
CMOD - Modulation Capacitance (µF)
FMOD v CMOD
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ZSD100
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
VCC - Supply Voltage (V)
IQ v VCC
Issue 8 - June 2007
© Zetex Semiconductors plc 2007
20
PDIS - Maximum Power Dissipation (mW)
TYPICAL CHARACTERISTICS
800
700
600
500
400
300
200
100
0
-50
-25
0
25
50
75
100
125
TAMB - Ambient Temperature (°C)
Derating Curve
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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
C OUT
6Ω
SPEAKER
ZTX
690B
ZTX
690B
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.
Issue 8 - June 2007
© Zetex Semiconductors plc 2007
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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
_
SAW
Q
C MOD
Q
GND
C MOD
VCC
C OUT
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.
Issue 8 - June 2007
© Zetex Semiconductors plc 2007
www.zetex.com
ZSD100
SO8
Package Suffix – N8
Top View
Part Number
Package
Part Mark
ZSD100N8
SO8
ZSD100
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or conditions of supply of any product or service.
Issue 8 - June 2007
© Zetex Semiconductors plc 2007
www.zetex.com