VFC320 Datasheet, PDF (1/9 Pages) Burr-Brown (TI) – Voltage-to-Frequency and Frequency-to-Voltage CONVERTER

®
VFC320
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 20ppm/°C max GAIN DRIFT
q OUTPUT TTL/CMOS COMPATIBLE
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 LONG TERM INTEGRATOR
q HIGH RESOLUTION OPTICAL LINK FOR
ISOLATION
q AC LINE FREQUENCY MONITOR
q MOTOR SPEED MONITOR AND CONTROL
+V_CC
V_OUT
DESCRIPTION
The VFC320 monolithic voltage-to-frequency and fre-
quency-to-voltage 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 exter-
nal 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 inte-
gration). The other resistor is a non-critical open
collector pull-up (f to +V ). The VFC320 is avail-
OUT
CC
able in three performance/temperature grades and two
package configurations. The TO-100 versions are her-
metically sealed, and specified for the –25°C to +85°C
and –55°C to +125°C ranges, and the dual-in-line
units are specified from –25°C to +85°C.
f_IN
–In
+In
Flip-
Comparators
flop
f_OUT
–7.5V Ref
One-shot
–V_CC
C₁
Common
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©_{1982 Burr-Brown Corporation}
PDS-483J
Printed in U.S.A. August, 1993