VFC320CPG4

VFC320 VFC 320 SBVS017A – AUGUST 2001 Voltage-to-Frequency and Frequency-to-Voltage CONVERTER FEATURES DESCRIPTION ● 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 The VFC320 monolithic voltage-to-frequency and frequency-tovoltage converter provides a simple low cost method of 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. Output pulses are compatible with TTL, and CMOS logic families. High linearity (0.005%, max at 10kHz FS) is achieved with relatively few external components. Two external resistors and two external capacitors are required to operate. Full scale frequency and input voltage are determined by a resistor in series with –In and two capacitors (one-shot 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 grades. The VFC320 is specified for the –25°C to +85°C, range. APPLICATIONS ● INEXPENSIVE A/D AND D/A CONVERTER ● DIGITAL PANEL METERS ● TWO-WIRE DIGITAL TRANSMISSION WITH NOISE IMMUNITY ● FM MOD/DEMOD OF TRANSDUCER SIGNALS ● PRECISION LONG TERM INTEGRATOR ● HIGH RESOLUTION OPTICAL LINK FOR ISOLATION ● AC LINE FREQUENCY MONITOR ● MOTOR SPEED MONITOR AND CONTROL +VCC VOUT fIN –In +In Comparators –7.5V Ref Flipflop fOUT One-shot –VCC C1 Common Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright © 1982, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com ELECTRICAL CHARACTERISTICS At TA = +25°C and ±15VDC power supply, unless otherwise noted. VFC320BP PARAMETER CONDITIONS MIN Fig. 4 with e2 = 0 Fig. 4 with e1 = 0 IIN = VIN/RIN >0