Zetex ZSD100D8, ZSD100N8 Datasheet

AUTOMOTIVE AND HOUSEHOLD

T

SECURITY SIREN DRIVER

ISSUE 6 – JANUARY 1998

ZSD100

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 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.

SCHEMATIC DIAGRAM

R

(INT)

R

T

T

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

•

- 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.

•

C

MOD

SAW

Low
Frequency
Oscillator

Control
Voltage

Audio
Voltage
Controlled
Oscillator

Oscillator
Output

Output
Driver

4-321

Q

Q

C

OU

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 R

R (INT)

R

T

C

MOD

SAW

T

Low
Frequency
Oscillator

Control
Voltage

(INT) and capacitors C

T

Output
Driver

MOD

and C

Q

Q

OUT

.

Audio
Voltage
Controlled
Oscillator

Oscillator
Output

C

OUT

PIN DESCRIPTIONS

1. R

T

2. SAW Selection of modulation waveform is made using the SAW pin. An open circuit

3. C

4. G

5. C

MOD

ND

OUT

6. Q Non inverted output driver

7.

Q Inverted output driver

8. V

CC

Optional external resistor for improved frequency control. An external resistor
improves the control of both the modulating and output oscillators.
The R

pin is also used to power the device down. Either connecting RT to VCC or

T

an open circuit will result in the device being disabled.

produces a triangle wave, sawtooth is achieved by connecting SAW to the C

MOD

pin.

An external capacitor is used to program the low frequency modulating oscillator.
The value of C

An external capacitor is used to program the output oscillator. The value of C

recommended is between 0.1µF and 100µF.

MOD

OUT

recommended is between 1nF and 100nF.

4-322

ZSD100

ABSOLUTE MAXIMUM RATING

V

cc

Operating Temperature -40 to 125°C
Storage Temperature -65 to 150°C

-0.5V to +20V

Power Dissipation (T

SO8 625mW
DIL8 625mW

amb

=25°C)

ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):T

PARAMETER SYMBOL MIN. TYP. MAX. CONDITIONS.

Supply Voltage Operating
Range

Supply Current

Disabled
Enabled

Modulating Oscillator

Frequency Range F

Frequency Value

See Note 1

Output Oscillator

Frequency Range

Centre Frequency
Deviation
Duty Cycle

Output

Source Current
Sink Current
Open Circuit Voltage

( Note 2)

V

CC

I

CC

MOD

F

MOD

F

OUT

F

OUT

∆F

OUT

I

SOURCE

I

SINK

V

OUT(HIGH)

V

OUT(LOW)

4V 18V

0.1Hz 10Hz VCC=4 to 18V

3.3Hz

5.1Hz

4.3Hz

5.5Hz

100Hz 10kHz VCC=4 to 18V

1.01kHz 1.26kHz

±33%
49%

5mA

0.5mA
V

-1.5V

CC

=25°C, VCC=12V

amb

1µA
25mA

5.4Hz

5.9Hz

1.58kHz

55%

0.5V

R

O/C, VCC=18V

T

R

, Q, Q at Gnd, VCC=18V

T

R

=0, C

T

MOD

R

=470kΩ, C

T

RT=0, C

OUT

=1.4V

V

OUT

V

=1.4V

OUT

I

=100µA

OUT

I

=0.1µA

SINK

=10µF

MOD

=22nF

=1µF

Frequency Control
Components

Internal Resistor
External Resistor
Modulation Capacitor
Output Capacitor

Note 1.

Note 2.

F

F

MOD

OUT

=

=

R

(INT)

T

R

(EXT)

T

C

MOD

C

OUT

2850

C

(61.5+

1710

(61.5+

R

R

T

MOD

C

OUT

T

(

(

EXT

EXT

) )

) )

0

0.1µF
1nF

Hz

Hz

61.5kΩ
1MΩ
100µF
100nF

C

in µF, RT (EXT) in kΩ

MOD

C

in µF, RT (EXT) in kΩ

OUT

4-323