Adadadada

VFC320
VFC 320

SBVS017A – AUGUST 2001

Voltage-to-Frequency and Frequency-to-Voltage CONVERTER
FEATURES
q HIGH LINEARITY: 12 to 14 bits ±0.005% max at 10kHz FS ±0.03% max at 100kHz FS ±0.1%typ at 1MHz FS q V/F OR F/V CONVERSION q 6-DECADE DYNAMIC RANGE q GAIN DRIFT: 20ppm/°C max q OUTPUT TTL/CMOS COMPATIBLE

DESCRIPTION
The VFC320 monolithic voltage-to-frequency andfrequency-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 tothe 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 timingand 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
q INEXPENSIVE A/D AND D/A CONVERTER q DIGITAL PANEL METERS q TWO-WIRE DIGITAL TRANSMISSION WITH NOISE IMMUNITY q FM MOD/DEMOD OF TRANSDUCER SIGNALS q PRECISION LONGTERM INTEGRATOR q HIGH RESOLUTION OPTICAL LINK FOR ISOLATION q AC LINE FREQUENCY MONITOR q MOTOR SPEED MONITOR AND CONTROL
+VCC –In +In VOUT fIN

Comparators –7.5V Ref

Flipflop

fOUT

One-shot–VCC

C1

Common

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PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard...