LM567/LM567C
Tone Decoder
General 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 cir-
cuit consists of an I and Q detector driven by a voltage con-
trolled oscillator which determines the center frequency of
the decoder. External components are used to indepen-
dently set center frequency, bandwidth and output delay.
Features
n
20 to 1 frequency range with an external resistor
n
Logic compatible output with 100 mA current sinking
capability
n
Bandwidth adjustable from 0 to 14%
n
High rejection of out of band signals and noise
n
Immunity to false signals
n
Highly stable center frequency
n
Center frequency adjustable from 0.01 Hz to 500 kHz
Applications
n
Touch tone decoding
n
Precision oscillator
n
Frequency monitoring and control
n
Wide band FSK demodulation
n
Ultrasonic controls
n
Carrier current remote controls
n
Communications paging decoders
Connection Diagrams
Metal Can Package
DS006975-1
Top View
Order Number LM567H or LM567CH
See NS Package Number H08C
Dual-In-Line and Small Outline Packages
DS006975-2
Top View
Order Number LM567CM
See NS Package Number M08A
Order Number LM567CN
See NS Package Number N08E
May 1999
LM567/LM567C
T
one
Decoder
1999 National Semiconductor Corporation
DS006975
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Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage Pin
9V
Power Dissipation (Note 2)
1100 mW
V
8
15V
V
3
-10V
V
3
V
4
+ 0.5V
Storage Temperature Range
-65C to +150C
Operating Temperature Range
LM567H
-55C to +125C
LM567CH, LM567CM, LM567CN
0C to +70C
Soldering Information
Dual-In-Line Package
Soldering (10 sec.)
260C
Small Outline Package
Vapor Phase (60 sec.)
215C
Infrared (15 sec.)
220C
See AN-450 "Surface Mounting Methods and Their Effect
on Product Reliability" for other methods of soldering
surface mount devices.
Electrical Characteristics
AC Test Circuit, T
A
= 25C, V
+
= 5V
Parameters
Conditions
LM567
LM567C/LM567CM
Units
Min
Typ
Max
Min
Typ
Max
Power Supply Voltage Range
4.75
5.0
9.0
4.75
5.0
9.0
V
Power Supply Current Quiescent
R
L
= 20k
6
8
7
10
mA
Power Supply Current Activated
R
L
= 20k
11
13
12
15
mA
Input Resistance
18
20
15
20
k
Smallest Detectable Input Voltage
I
L
= 100 mA, f
i
= f
o
20
25
20
25
mVrms
Largest No Output Input Voltage
I
C
= 100 mA, f
i
= f
o
10
15
10
15
mVrms
Largest Simultaneous Outband Signal to
Inband Signal Ratio
6
6
dB
Minimum Input Signal to Wideband Noise
Ratio
B
n
= 140 kHz
-6
-6
dB
Largest Detection Bandwidth
12
14
16
10
14
18
% of f
o
Largest Detection Bandwidth Skew
1
2
2
3
% of f
o
Largest Detection Bandwidth Variation
with Temperature
0.1
0.1
%/C
Largest Detection Bandwidth Variation
with Supply Voltage
4.756.75V
1
2
1
5
%V
Highest Center Frequency
100
500
100
500
kHz
Center Frequency Stability (4.755.75V)
0
<
T
A
<
70
-55
<
T
A
<
+125
35
60
35
140
35
60
35
140
ppm/C
ppm/C
Center Frequency Shift with Supply
Voltage
4.75V6.75V
4.75V9V
0.5
1.0
2.0
0.4
2.0
2.0
%/V
%/V
Fastest ON-OFF Cycling Rate
f
o
/20
f
o
/20
Output Leakage Current
V
8
= 15V
0.01
25
0.01
25
A
Output Saturation Voltage
e
i
= 25 mV, I
8
= 30 mA
e
i
= 25 mV, I
8
= 100 mA
0.2
0.6
0.4
1.0
0.2
0.6
0.4
1.0
V
Output Fall Time
30
30
ns
Output Rise Time
150
150
ns
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is func-
tional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guar-
antee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is
given, however, the typical value is a good indication of device performance.
Note 2: The maximum junction temperature of the LM567 and LM567C is 150C. For operating at elevated temperatures, devices in the TO-5 package must be de-
rated based on a thermal resistance of 150C/W, junction to ambient or 45C/W, junction to case. For the DIP the device must be derated based on a thermal resis-
tance of 110C/W, junction to ambient. For the Small Outline package, the device must be derated based on a thermal resistance of 160C/W, junction to ambient.
Note 3: Refer to RETS567X drawing for specifications of military LM567H version.
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2
Schematic Diagram
Typical Performance Characteristics
DS006975-3
Typical Frequency Drift
DS006975-10
Typical Bandwidth Variation
DS006975-11
Typical Frequency Drift
DS006975-12
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3
Typical Performance Characteristics
(Continued)
Typical Frequency Drift
DS006975-13
Bandwidth vs Input Signal
Amplitude
DS006975-14
Largest Detection Bandwidth
DS006975-15
Detection Bandwidth as a
Function of C
2
and C
3
DS006975-16
Typical Supply Current vs
Supply Voltage
DS006975-17
Greatest Number of Cycles
Before Output
DS006975-18
Typical Output Voltage vs
Temperature
DS006975-19
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4
Typical Applications
Touch-Tone Decoder
DS006975-5
Component values (typ)
R1
6.8 to 15k
R2
4.7k
R3
20k
C1
0.10 mfd
C2
1.0 mfd 6V
C3
2.2 mfd 6V
C4
250 mfd 6V
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5
Typical Applications
(Continued)
AC Test Circuit
Applications Information
The center frequency of the tone decoder is equal to the free
running frequency of the VCO. This is given by
The bandwidth of the filter may be found from the approxi-
mation
Where:
V
i
= Input voltage (volts rms), V
i
200 mV
C
2
= Capacitance at Pin 2 (F)
Oscillator with Quadrature Output
DS006975-6
Connect Pin 3 to 2.8V to Invert Output
Oscillator with Double Frequency Output
DS006975-7
Precision Oscillator Drive 100 mA Loads
DS006975-8
DS006975-9
f
i
= 100 kHz + 5V
*
Note: Adjust for f
o
= 100 kHz.
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6
Physical Dimensions
inches (millimeters) unless otherwise noted
Metal Can Package (H)
Order Number LM567H or LM567CH
NS Package Number H08C
Small Outline Package (M)
Order Number LM567CM
NS Package Number M08A
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7
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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www.national.com
Molded Dual-In-Line Package (N)
Order Number LM567CN
NS Package Number N08E
LM567/LM567C
T
one
Decoder
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.
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