The VFC320 monolithic voltage-frequency and frequency-voltage converters provide a simple and low-cost method for converting analog signals into digital pulses. The digital output is an open collector and the digital pulse train repetition rate is proportional to the amplitude of the analog input voltage. The output pulse is compatible with TTL and CMOS logic families. High linearity (0.005%, maximum at 10kHz FS) achieves relatively few external components.
Pin arrangement
The operating temperature of the VFC320 ranges from -25 ° C to +85 ° C. Operation requires two external resistors and two external capacitors. The full range frequency and input voltage are determined by a resistor in series with the -In and two capacitors (one-time timing and input amplifier integration). The other resistor is a non-critical open collector pull-up (fOUT to +VCC). The VFC320 is available in two performance levels.
Functional Block Diagram of the VFC320
Features
● HIGH LINEARITY: 12 to 14 bits
- ±0.005% max at 10kHz FS
- ±0.03% max at 100kHz FS
- ±0.1% typ at 1MHz FS
● V/F OR F/V CONVERSION
● 6-DECADE DYNAMIC RANGE
● GAIN DRIFT: 20ppm/°C max
● OUTPUT TTL/CMOS COMPATIBLE
Applications
● Cheap A/D and D/A converters
● Digital panel instrument
● Double wire digital transmission tape Noise immunity
● Frequency converter FM mod/demod signal
● Precision long-term integrator
● High resolution optical link for isolation
● Ac line frequency monitor
● Motor speed monitoring
