TC9400/9401/9402
Voltage-to-Frequency/Frequency-to-Voltage Converters
Features
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.
VOLTAGE-TO-FREQUENCY
• Choice of Linearity
- TC9401: 0.01%
- TC9400: 0.05%
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
proportional voltage output.
- TC9402: 0.25%
• DC to 100kHz (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
A complete V/F or F/V system only requires the addi-
tion of two capacitors, three resistors, and reference
voltage.
Package Type
FREQUENCY-TO-VOLTAGE
14-Pin Plastic DIP/CERDIP
• Operation: DC to 100kHz
• Choice of Linearity
- TC9401: 0.02%
I
BIAS
V
1
2
3
4
5
6
7
14
13
12
11
DD
ZERO ADJ
NC
- TC9400: 0.05%
- TC9402: 0.25%
I
AMPLIFIER OUT
IN
TC9400
TC9401
TC9402
• Programmable Scale Factor
THRESHOLD
DETECTOR
V
SS
Applications
V
OUT
GND
10 FREQ/2 OUT
REF
• µP Data Acquisition
9
8
OUTPUT COMMON
PULSE FREQ OUT
• 13-bit Analog-to-Digital Converters
• Analog Data Transmission and Recording
• Phase Locked Loops
V
REF
• Frequency Meters/Tachometer
• Motor Control
14-Pin SOIC
• FM Demodulation
I
BIAS
14
1
V
DD
Device Selection Table
ZERO ADJ
2
3
4
5
6
7
13
12
11
NC
I
IN
AMPLIFIER OUT
Part
Number
Linearity
(V/F)
Temperature
Range
Package
TC9400
TC9401
TC9402
V
THRESHOLD
DETECTOR
SS
TC9400COD
0.05%
14-Pin SOIC
(Narrow)
0°C to +70°C
V
OUT
GND
REF
FREQ/2 OUT
10
9
TC9400CPD
TC9400EJD
TC9401CPD
TC9401EJD
TC9402CPD
TC9402EJD
0.05%
0.05%
0.01%
0.01%
0.25%
0.25%
14-Pin PDIP
0°C to +70°C
OUTPUT COMMON
PULSE FREQ OUT
14-Pin CerDIP -40°C to +85°C
14-Pin PDIP 0°C to +70°C
14-Pin CerDIP -40°C to +85°C
V
REF
8
NC = No Internal Connection
14-Pin PDIP
0°C to +70°C
°C to +85°C
14-Pin CerDIP
2002 Microchip Technology Inc.
DS21483B-page 1