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TC9400/9401/9402
Voltage-to-Frequency / Frequency-to-Voltage Converters
Features:
VOLTAGE-TO-FREQUENCY
• Choice of Linearity: - TC9401: 0.01% - TC9400: 0.05% - TC9402: 0.25% • DC to 100 kHz (F/V) or 1 Hz to 100 kHz (V/F) • Low Power Dissipation: 27 mW (Typ.) • Single/Dual Supply Operation: - +8V to +15V or ±4V to ±7.5V • Gain Temperature Stability: ±25 ppm/°C (Typ.) • Programmable Scale Factor

General Description:
The TC9400/9401/9402 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 Frequency-to-Voltage (F/V) converters, accepting virtually any input frequency waveform and providing a linearly proportional voltage output. A complete V/F or F/V system only requires the addition of two capacitors, three resistors, and reference voltage.

FREQUENCY-TO-VOLTAGE
• Operation: DC to 100 kHz • Choice of Linearity: - TC9401: 0.02% - TC9400: 0.05% - TC9402: 0.25% • Programmable Scale Factor

Package Type
14-Pin Plastic DIP/CERDIP
IBIAS 1 ZERO ADJ 2 IIN 3 VSS 4 14 VDD 13 NC

Applications:
• • • • • • • Microprocessor Data Acquisition 13-bit Analog-to-Digital Converters (ADC) Analog Data Transmission and Recording Phase Locked Loops Frequency Meters/Tachometer Motor Control FM Demodulation

VREFOUT 5 GND 6 VREF 7

TC9400 TC9401 TC9402

12 AMPLIFIER OUT THRESHOLD 11 DETECTOR 10 FREQ/2 OUT 9 OUTPUT COMMON 8 PULSE FREQ OUT

14-Pin SOIC
IBIAS ZERO ADJ IIN VSS VREFOUT GND VREF 1 2 3 4 5 6 7 14 13 VDD NC AMPLIFIER OUT THRESHOLD DETECTOR FREQ/2 OUT OUTPUT COMMON PULSE FREQ OUT

TC9400 TC9401 TC9402

12 11 10 9 8

NC = No Internal Connection

© 2007 Microchip Technology Inc.

DS21483D-page 1

TC9400/9401/9402
Functional Block Diagram

Integrator Capacitor Input Voltage RIN IIN

Integrator Op Amp

Threshold Detector

One Shot

Pulse Output

Reference Capacitor TC9400 IREF

÷2

Pulse/2 Output

Reference Voltage

DS21483D-page 2

© 2007 Microchip Technology Inc.

TC9400/9401/9402
1.0 ELECTRICAL CHARACTERISTICS
† Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.

Absolute Maximum Ratings †
VDD – VSS ......................................................................+18V IIN ..................................................................................10 mA VOUTMAX – VOUT Common.................................................23V VREF – VSS .....................................................................-1.5V Storage Temperature Range.........................-65°C to +150°C Operating Temperature Range: C Device ...................................................... 0°C to +70°C E Device....................................................-40°C to +85°C Package Dissipation (TA ≤ 70°C): 8-Pin CerDIP ........................................................800 mW 8-Pin Plastic DIP ..................................................730 mW 8-Pin SOIC ...........................................................470 mW

TC940X ELECTRICAL SPECIFICATIONS
Electrical Characteristics: unless otherwise specified, VDD = +5V, VSS = -5V, VGND = 0V, VREF = -5V, RBIAS = 100 kΩ, Full Scale = 10 kHz. TA = +25°C, unless temperature range is specified (-40°C to +85°C for E device, 0°C to +70°C for C device). Parameter Min Typ Max Min Typ Max Min Typ Max Units Test Conditions

Voltage-to-Frequency
Accuracy Linearity 10 kHz — TC9400 0.01 0.05 — TC9401 0.004 0.01 — TC9402 0.05 0.25 % Output Deviation from Full Scale...
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