lmc567 National Semiconductor Corporation, lmc567 Datasheet

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lmc567

Manufacturer Part Number
lmc567
Description
Low Power Tone Decoder
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2004 National Semiconductor Corporation
LMC567
Low Power Tone Decoder
General Description
The LMC567 is a low power general purpose LMCMOS
tone decoder which is functionally similar to the industry
standard LM567. It consists of a twice frequency voltage-
controlled oscillator (VCO) and quadrature dividers which
establish the reference signals for phase and amplitude
detectors. The phase detector and VCO form a phase-
locked loop (PLL) which locks to an input signal frequency
which is within the control range of the VCO. When the PLL
is locked and the input signal amplitude exceeds an inter-
nally pre-set threshold, a switch to ground is activated on the
output pin. External components set up the oscillator to run
at twice the input frequency and determine the phase and
amplitude filter time constants.
Block Diagram
LMCMOS
is a trademark of National Semiconductor Corp.
(with External Components)
Order Number LMC567CM or LMC567CN
DS008670
See NS Package Number M08A or N08E
Features
n Functionally similar to LM567
n 2V to 9V supply voltage range
n Low supply current drain
n No increase in current with output activated
n Operates to 500 kHz input frequency
n High oscillator stability
n Ground-referenced input
n Hysteresis added to amplitude comparator
n Out-of-band signals and noise rejected
n 20 mA output current capability
00867001
www.national.com
June 1999

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lmc567 Summary of contents

Page 1

... LMC567 Low Power Tone Decoder General Description The LMC567 is a low power general purpose LMCMOS tone decoder which is functionally similar to the industry standard LM567. It consists of a twice frequency voltage- controlled oscillator (VCO) and quadrature dividers which establish the reference signals for phase and amplitude detectors ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage, Pin 3 Supply Voltage, Pin 4 Output Voltage, Pin 8 Voltage at All Other Pins Output Current, ...

Page 3

Test Circuit RtCt 100k 300 pF #2 10k 300 00867002 www.national.com ...

Page 4

Typical Performance Characteristics Supply Current vs. Operating Frequency Largest Detection Bandwidth vs. Temp. Frequency Drift with Temperature www.national.com 00867003 00867008 00867010 4 Bandwidth vs. Input Signal Level 00867007 Bandwidth as a Function of C2 00867009 Frequency Drift with Temperature 00867011 ...

Page 5

... This is generally accomplished by using a variable resistor as part of Rt, although Ct could also be padded. The amount of initial frequency variation due to the LMC567 itself is given in the electrical specifications; the total trim range must also ac- commodate the tolerances of Rt and Ct. ...

Page 6

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Molded Small Outline (SO) Package (M) Order Number LMC567CM NS Package Number M08A Molded Dual-In-Line Package (N) Order Number LMC567CN NS Package Number N08E 6 ...

Page 7

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

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