KT3170 Datasheet (Samsung semiconductor)

KT3170, LOW POWER DTMF RECEIVER

Pin No 1 2 3 4 5 Symbol IN + IN GS VREF IIN Description Non inverting input of the op amp.

Inverting input of the op amp.

Gain Select.

The output used for gain adjustment of analog input signal with a feedback resistor.

Reference Voltage output (VDD/2, Typ) can be used to bias the op amp input of VD

KT3170 LOW POWER DTMF RECEIVER INTRODUCTION 18-DIP-300A The KT3170 is a complete Dual Tone Multiple Frequency (DTMF) receiver that is fabricated by low power CMOS and the Switched-Capacitor Filter technology.

This LSI consists of band split filters, which seperates counting section which verifies the frequency and duration of the received tones before passing the corresponding code to the output bus.

It decodes all 16 DTMF tone pairs into a 4bits digital code.

The externally required component

KT3170 Features

* Detects all 16 standard tones. Low power consumption : 15mW (Typ) Single power supply : 5V Uses inexpensive 3.58MHz crystal Three state outputs for microprocessor interface Good quality and performance for using in exchange system