TC9400COD713 Microchip

TC9400/9401/9402 Voltage-to-Frequency / Frequency-to-Voltage Converters Features: General Description: The TC9400/9401/9402 are low-cost Voltage-to-Fre- VOLTAGE-TO-FREQUENCY quency (V/F) converters, utilizing low-power CMOS Choice of Linearity: technology. The converters accept a variable analog - TC9401: 0.01% input signal and generate an output pulse train, whose frequency is linearly proportional to the input voltage. - TC9400: 0.05% - TC9402: 0.25% The devices can also be used as highly accurate Frequency-to-Voltage (F/V) converters, accepting DC to 100 kHz (F/V) or 1 Hz to 100 kHz (V/F) virtually any input frequency waveform and providing a Low Power Dissipation: 27 mW (Typ.) linearly proportional voltage output. Single/Dual Supply Operation: A complete V/F or F/V system only requires the - +8V to +15V or 4V to 7.5V addition of two capacitors, three resistors, and refer- Gain Temperature Stability: 25 ppm/C (Typ.) ence voltage. Programmable Scale Factor Package Type FREQUENCY-TO-VOLTAGE Operation: DC to 100 kHz 14-Pin Plastic DIP/CERDIP Choice of Linearity: I V BIAS 1 14 DD - TC9401: 0.02% - TC9400: 0.05% 2 13 NC ZERO ADJ - TC9402: 0.25% I IN 3 12 AMPLIFIER OUT Programmable Scale Factor TC9400 THRESHOLD V SS 4 TC9401 11 DETECTOR TC9402 Applications: V OUT 5 10 FREQ/2 OUT REF Microprocessor Data Acquisition GND 6 9 OUTPUT COMMON 13-bit Analog-to-Digital Converters (ADC) V 7 8 PULSE FREQ OUT REF Analog Data Transmission and Recording Phase Locked Loops Frequency Meters/Tachometer Motor Control 14-Pin SOIC FM Demodulation I 1 14 V BIAS DD 2 13 NC ZERO ADJ I 3 IN 12 AMPLIFIER OUT TC9400 THRESHOLD V 4 11 SS TC9401 DETECTOR TC9402 V OUT 5 10 FREQ/2 OUT REF 6 9 GND OUTPUT COMMON V PULSE FREQ OUT REF 7 8 NC = No Internal Connection 2007 Microchip Technology Inc. DS21483D-page 1TC9400/9401/9402 Functional Block Diagram Integrator Integrator Threshold One Capacitor Op Amp Detector Shot R IN Input Voltage I IN Pulse Output 2 Pulse/2 Output Reference Capacitor TC9400 I REF Reference Voltage DS21483D-page 2 2007 Microchip Technology Inc.