VCO

Phase

Detector

Amplitude

Detector

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÷2

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LMC567

SNOSBY1C – JUNE 1999 – REVISED DECEMBER 2015

LMC567 Low-Power Tone Decoder

1 Features

3 Description

The LMC567 device is a low-power, general-purpose

1

•

Functionally Similar to LM567

LMCMOS tone decoder which is functionally similar

•

2-V to 9-V Supply Voltage Range

to the industry standard LM567. The device consists

•

Low Supply Current Drain

of a twice frequency voltage-controlled oscillator

(VCO) and quadrature dividers which establish the

•

No Increase in Current With Output Activated

reference signals for phase and amplitude detectors.

•

Operates to 500-kHz Input Frequency

The phase detector and VCO form a phase-locked

•

High Oscillator Stability

loop (PLL) which locks to an input signal frequency

•

Ground-Referenced Input

which is within the control range of the VCO. When

•

Hysteresis Added to Amplitude Comparator

the PLL is locked and the input signal amplitude

exceeds an internally pre-set threshold, a switch to

•

Out-of-Band Signals and Noise Rejected

ground is activated on the output pin. External

•

20-mA Output Current Capability

components set up the oscillator to run at twice the

input frequency and determine the phase and

2 Applications

amplitude filter time constants.

•

Touch-Tone Decoding

Device Information (1)

•

Precision Oscillators

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Frequency Monitoring and Control

LMC567

SOIC (8)

4.90 mm × 3.91 mm

•

Wide-Band FSK Demodulation

(1) For all available packages, see the orderable addendum at

•

Ultrasonic Controls

the end of the data sheet.

•

Carrier Current Remote Controls

•

Communications Paging Decoders

Simplified Diagram

1

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.