ZSD100_06 datasheet(2/8 Pages) ZETEX

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Issue 7 - July 2006

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ZSD100

Low

Frequency

Oscillator

Output

Driver

Oscillator

Output

Control

Voltage

Audio

Voltage

Controlled

Oscillator

SAW

R (INT)

MOD

C OUT

PIN DESCRIPTIONS

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.

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.

CMOD

An external capacitor is used to program the low frequency modulating oscillator.

The value of CMOD recommended is between 0.1

µF and 100µF.

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

VCC

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 .

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