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 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.
The TC9400 series are low‑cost converters that transform an analog voltage into a proportional pulse frequency (V/F) or convert an input frequency into a proportional voltage (F/V). They use low‑power CMOS technology and require only two capacitors, three resistors, and a reference voltage for a complete system.
Key features include selectable linearity (0.01%‑0.25%), programmable scale factor, low power dissipation (27 mW typical), and gain temperature stability of +25 ppm/°C. The devices operate from single or dual supplies (+8 V to +15 V or +4 V to +7.5 V) and are available in 14‑pin PDIP, SOIC, and CERDIP packages.
| Linearity (V/F) TC9400 | 0.05% |
|---|---|
| Linearity (V/F) TC9401 | 0.01% |
| Linearity (V/F) TC9402 | 0.25% |
| Low Power Dissipation (typ.) | 27 mW |
| Supply Voltage Range | +8 V to +15 V or +4 V to +7.5 V |
| Gain Temperature Stability (typ.) | +25 ppm/°C |
| Operating Temperature Range | -65 °C to +150 °C |
| Quiescent Supply Current (Ipp) TC9400 | 1.5 mA (typ.) |
| Quiescent Supply Current (Ipp) TC9402 | 3 mA (typ.) |
The typical power dissipation is 27 mW.
The devices operate from +8 V to +15 V or from +4 V to +7.5 V.
Gain temperature stability is +25 ppm/°C typical.