VFC121AP

Manufacturer Part NumberVFC121AP
DescriptionIC SINGLE SUPPLY V/F CONV 14 DIP
ManufacturerTexas Instruments
VFC121AP datasheets

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Specifications of VFC121AP

Converter FunctionVFCFull Scale Frequency1000
Power Supply RequirementSingleSingle Supply Voltage (typ)5V
Single Supply Voltage (max)36VSingle Supply Voltage (min)4.5V
Dual Supply Voltage (typ)Not RequiredVDual Supply Voltage (min)Not RequiredV
Dual Supply Voltage (max)Not RequiredVOperating Temperature (min)-25C
Operating Temperature (max)85COperating Temperature ClassificationCommercial
Package TypePDIPLead Free Status / RoHS StatusContains lead / RoHS non-compliant
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VOLTAGE-TO-FREQUENCY CONVERTER
FEATURES
SINGLE SUPPLY OPERATION:
+4.5V to +36V
f
= 1.5MHz max
O
LOW NONLINEARITY: 0.03% max at
100kHz, 0.1% max at 1MHz
HIGH INPUT IMPEDANCE
VOLTAGE REFERENCE OUTPUT
THERMOMETER OUTPUT: 1mV/ K
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
– 2.5V. Power supplies from 4.5V to
S
12
V
= 0 to +2V
11
IN
R
= 8k
BIAS
(Optional)
R
TRIM
R
= 8k
IN
R
IN
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1989 Burr-Brown Corporation
SBVS023
®
Precision Single Power Supply
APPLICATIONS
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 ( 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.
C
= 2700pF
INT
10
9
Integrator
Comparator
V
REF
I
REF
V
REF
4
6
2.6V
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
PDS-971A
VFC121
INTEGRATING A/D CONVERSION
ANALOG SIGNAL TRANSMISSION
PHASE-LOCKED LOOP VCO
GALVANICALLY ISOLATED SYSTEMS
+5V
Ground
V
+V
(Optional)
PULL UP
S
13
2
R
PULL UP
14
One
Shot
8
3
5
C
= 1200pF
OS
V
T
Printed in U.S.A. March, 1992
f
=
OUT
0 to 100kHz

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VFC121AP Summary of contents

  • Page 1

    VOLTAGE-TO-FREQUENCY CONVERTER FEATURES SINGLE SUPPLY OPERATION: +4.5V to +36V f = 1.5MHz max O LOW NONLINEARITY: 0.03% max at 100kHz, 0.1% max at 1MHz HIGH INPUT IMPEDANCE VOLTAGE REFERENCE OUTPUT THERMOMETER OUTPUT: 1mV/ K DESCRIPTION The VFC121 is a monolithic ...

  • Page 2

    ... V (Disabled) HIGH V LOW I (Disabled) HIGH I LOW POWER SUPPLY Voltage Current TEMPERATURE RANGE Specified Storage * Same specification as VFC121AP. NOTE: (1) One pulse of new frequency plus 1 s. ORDERING INFORMATION LINEARITY ERROR, MAX MODEL PACKAGE (f = 100kHz) S VFC121AP Plastic DIP 0.05% VFC121BP Plastic DIP 0.03% The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk ...

  • Page 3

    ... PACKAGE INFORMATION MODEL PACKAGE VFC121AP 14-Pin Plastic DIP VFC121BP 14-Pin Plastic DIP NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix D of Burr-Brown IC Data Book. ...

  • Page 4

    TYPICAL PERFORMANCE CURVES + +5V, and unless otherwise noted JITTER vs FULL SCALE FREQUENCY 700 600 500 400 300 Full Scale Frequency ...

  • Page 5

    TYPICAL PERFORMANCE CURVES + +5V, and unless otherwise noted QUIESCENT CURRENT vs TEMPERATURE 10 9 +36V +12V S 7.5 ...

  • Page 6

    C = 2700pF INT + BIAS (Optional) R TRIM FIGURE 3. 2V Full Scale Input, 100kHz Full Scale Output. the integrating op amp to ...

  • Page 7

    The size of the bucket (the capacitor value) is not critical, since it primarily determines how far below V integrator ramps during the one-shot period. At the same time, the capacitor used must not ...

  • Page 8

    V minus 2V full scale input) as compared with a 2.6V delta REF input ...

  • Page 9

    ... Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability ...

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