ZSD100 Ver la hoja de datos (PDF) - Diodes Incorporated.
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ZSD100 Datasheet PDF : 8 Pages
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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
Control
Voltage
Audio
Voltage
Controlled
Oscillator
Output
Driver
Oscillator
Output
Q
Q
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
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