
3-287
TELCOM SEMICONDUCTOR, INC.
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TC9400
TC9401
TC9402
VOLTAGE-TO-FREQUENCY/FREQUENCY-TO-VOLTAGE CONVERTERS
FEATURES
Voltage-to-Frequency
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Choice of Guaranteed Linearity:
TC9401.........................................................0.01%
TC9400.........................................................0.05%
TC9402.........................................................0.25%
DC to 100 kHz (F/V) or 1Hz to 100kHz (V/F)
Low Power Dissipation .......................... 27mW Typ
Single/Dual Supply Operation .................................
+ 8V to + 15V or
±
4V to
±
7.5V
Gain Temperature Stability ..........
±
25 ppm/
°
C Typ
Programmable Scale Factor
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Frequency-to-Voltage
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Operation........................................... DC to 100 kHz
Choice of Guaranteed Linearity:
TC9401.........................................................0.02%
TC9400.........................................................0.05%
TC9402.........................................................0.25%
Programmable Scale Factor
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APPLICATIONS
μ
P Data Acquisition
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13-Bit Analog-to-Digital Converters
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Analog Data Transmission and Recording
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Phase-Locked Loops
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Frequency Meters/Tachometer
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Motor Control
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FM Demodulation
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GENERAL DESCRIPTION
The TC9400/TC9401/TC9402 are low-cost voltage-to-
frequency (V/F) converters utilizing low power CMOS
technology. The converters accept a variable analog input
signal and generate an output pulse train whose frequency
is linearly proportional to the input voltage.
The devices can also be used as highly-accurate fre-
quency-to-voltage (F/V) converters, accepting virtually any
input frequency waveform and providing a linearly-propor-
tional voltage output.
A complete V/F or F/V system only requires the addition
of two capacitors, three resistors, and reference voltage.
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IN
I
REF
TC9400
R
IN
Integrator
OpAmp
Integrator
Capacitor
Threshold
Detector
One
Shot
Pulse Output
Pulse/2 Output
÷
2
Input
Voltage
Reference
Capacitor
Reference
Voltage
ORDERING INFORMATION
Linearity
(V/F)
Temperature
Range
0
°
C to +70
°
C
Part No.
Package
TC9400COD
0.05%
14-Pin
SOIC (Narrow)
14-Pin
Plastic DIP
14-Pin
CerDIP
14-Pin
Plastic DIP
14-Pin
CerDIP
14-Pin
Plastic DIP
14-Pin
CerDIP
TC9400CPD
0.05%
0
°
C to +70
°
C
TC9400EJD
0.05%
– 40
°
C to +85
°
C
TC9401CPD
0.01%
0
°
C to +70
°
C
TC9401EJD
0.01%
– 40
°
C to +85
°
C
TC9402CPD
0.25%
0
°
C to +70
°
C
TC9402EJD
0.25%
– 40
°
C to +85
°
C
FUNCTIONAL BLOCK DIAGRAM
TC9400/1/2-5 11/6/96