LM567x Tone Decoder

1 Features

• 20 to 1 Frequency Range With an External

Resistor

• Logic Compatible Output With 100-mA Current

Sinking Capability

• Bandwidth Adjustable From 0 to 14%

• High Rejection of Out of Band Signals and Noise

• Immunity to False Signals

• Highly Stable Center Frequency

• Center Frequency Adjustable from 0.01 Hz to

500 kHz

2 Applications

• Touch Tone Decoding

• Precision Oscillator

• Frequency Monitoring and Control

• Wide Band FSK Demodulation

• Ultrasonic Controls

• Carrier Current Remote Controls

• Communications Paging Decoders

3 Description

The LM567 and LM567C are general purpose tone

decoders designed to provide a saturated transistor

switch to ground when an input signal is present

within the passband. The circuit consists of an I and Q

detector driven by a voltage controlled oscillator which

determines the center frequency of the decoder.

External components are used to independently set

center frequency, bandwidth and output delay.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM567C

SOIC (8)

4.90 mm × 3.91 mm

PDIP (8)

9.81 mm × 6.35 mm

(1)

For all available packages, see the orderable addendum at

the end of the datasheet.

Simplified Diagram

LM567, LM567C

SNOSBQ4F – MAY 1999 – REVISED JANUARY 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.