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Burr-Brown Corporation - Synchronized VOLTAGE-TO-FREQUENCY CONVERTER

Numéro de référence VFC100
Description Synchronized VOLTAGE-TO-FREQUENCY CONVERTER
Fabricant Burr-Brown Corporation 
Logo Burr-Brown Corporation 





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VFC100 fiche technique
® VFC100
FPO
Synchronized
VOLTAGE-TO-FREQUENCY CONVERTER
FEATURES
q FULL-SCALE FREQUENCY SET BY
SYSTEM CLOCK; NO CRITICAL
EXTERNAL COMPONENTS REQUIRED
q PRECISION 10V FULL-SCALE INPUT,
0.5% max GAIN ERROR
q ACCURATE 5V REFERENCE VOLTAGE
q EXCELLENT LINEARITY:
0.02% max at 100kHz FS
0.1% max at 1MHz FS
q VERY LOW GAIN DRIFT: 50ppm/°C
APPLICATIONS
q A/D CONVERSION
q PROCESS CONTROL
q DATA ACQUISITION
q VOLTAGE ISOLATION
DESCRIPTION
The VFC100 voltage-to-frequency converter is an
important advance in VFCs. The well-proven charge
balance technique is used; however, the critical reset
integration period is derived from an external clock
frequency. The external clock accurately sets an out-
put full-scale frequency, eliminating error and drift
from the external timing components required for
other VFCs. A precision input resistor is provided
which accurately sets a 10V full-scale input voltage.
In many applications the required accuracy can be
achieved without external adjustment.
The open collector active-low output provides fast fall
time on the important leading edge of output pulses,
and interfaces easily with TTL and CMOS circuitry.
An output one-shot circuit is particularly useful to
provide optimum output pulse widths for optical cou-
plers and transformers to achieve voltage isolation. An
accurate 5V reference is also provided which is useful
for applications such as offsetting for bipolar input
voltages, exciting bridges and sensors, and autocali-
bration schemes.
VIN
Non-Inverting
Input
C INT
5
– Comparator
VOUT
Input
4 14
Clock
Input
10
7 RIN
Integrator
Amplifier
6 20k
SW1
Comparator
Clocked
Logic
+VCC
1
Output
One-Shot
11
fOUT
12 Digital
Common
1mA
–VCC
13
Analog
Common
15
+ Comparator
Input
5V
Reference
16
VREF
9
COS
8
–VCC
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1984 Burr-Brown Corporation
PDS-547H
Printed in U.S.A. June, 1995

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