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VFC121BP Datasheet

  • VFC121BP

  • Precision Single Power Supply VOLTAGE-TO-FREQUENCY CONVERTER

  • 8頁

  • BB

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VFC121
Precision Single Power Supply
VOLTAGE-TO-FREQUENCY CONVERTER
FEATURES
q
SINGLE SUPPLY OPERATION:
+4.5V to +36V
q
f
O
= 1.5MHz max
q
LOW NONLINEARITY: 0.03% max at
100kHz, 0.1% max at 1MHz
q
HIGH INPUT IMPEDANCE
q
VOLTAGE REFERENCE OUTPUT
q
THERMOMETER OUTPUT: 1mV/
擄
K
APPLICATIONS
q
INTEGRATING A/D CONVERSION
q
ANALOG SIGNAL TRANSMISSION
q
PHASE-LOCKED LOOP VCO
q
GALVANICALLY ISOLATED SYSTEMS
DESCRIPTION
The VFC121 is a monolithic voltage-to-frequency
converter consisting of an integrating amplifier, volt-
age reference, and one-shot charge pump circuitry.
High-frequency complementary NPN/PNP circuitry is
used to implement the charge-balance technique,
achieving speed and accuracy far superior to previous
single power supply VFCs.
The high-impedance input accepts signals from ground
potential to V
S
鈥?2.5V. Power supplies from 4.5V to
36V may be used. A 2.6V reference voltage output
may be used to excite sensors or bias external cir-
cuitry. A thermometer output voltage proportional to
absolute temperature (擄K) may be used as a tempera-
ture sensor or for temperature compensation of appli-
cations circuits.
Frequency output is an open-collector transistor. A
disable pin forces the output to the high impedance
state, allowing multiple VFCs to share a common
transmission path.
+5V
+V
S
Ground
(Optional)
2
R
PULL UP
Comparator
14
One
Shot
8
V
REF
f
OUT
=
0 to 100kHz
V
PULL UP
C
INT
= 2700pF
12
V
IN
= 0 to +2V
R
BIAS
= 8k鈩?/div>
(Optional)
11
Integrator
10
9
13
V
REF
I
REF
R
TRIM
R
IN
= 8k鈩?/div>
R
IN
4
6
2.6V
3
V
T
5
C
OS
= 1200pF
International Airport Industrial Park 鈥?Mailing Address: PO Box 11400 鈥?Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd. 鈥?Tucson, AZ 85706
Tel: (520) 746-1111 鈥?Twx: 910-952-1111 鈥?Cable: BBRCORP 鈥?Telex: 066-6491 鈥?FAX: (520) 889-1510 鈥?Immediate Product Info: (800) 548-6132
漏 1989 Burr-Brown Corporation
PDS-971A
Printed in U.S.A. March, 1992

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