VFC32KP Datasheet PDF - Burr-Brown Corporation
| Part Number | VFC32KP | |
| Description | Voltage-to-Frequency and Frequency-to-Voltage CONVERTER | |
| Manufacturers | Burr-Brown Corporation | |
| Logo |  |
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There is a preview and VFC32KP download ( pdf file ) link at the bottom of this page. Total 7 Pages | ||
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® VFC32
Voltage-to-Frequency
and Frequency-to-Voltage
CONVERTER
FEATURES
q OPERATION UP TO 500kHz
q EXCELLENT LINEARITY
±0.01% max at 10kHz FS
±0.05% max at 100kHz FS
q V/F OR F/V CONVERSION
q MONOTONIC
q VOLTAGE OR CURRENT INPUT
APPLICATIONS
q INTEGRATING A/D CONVERTER
q SERIAL FREQUENCY OUTPUT
q ISOLATED DATA TRANSMISSION
q FM ANALOG SIGNAL MOD/DEMOD
q MOTOR SPEED CONTROL
q TACHOMETER
DESCRIPTION
The VFC32 voltage-to-frequency converter provides
an output frequency accurately proportional to its
input voltage. The digital open-collector frequency
output is compatible with all common logic families.
Its integrating input characteristics give the VFC32
excellent noise immunity and low nonlinearity.
Full-scale output frequency is determined by an exter-
nal capacitor and resistor and can be scaled over a
wide range. The VFC32 can also be configured as a
frequency-to-voltage converter.
The VFC32 is available in 14-pin plastic DIP, SO-14
surface-mount, and metal TO-100 packages. Commer-
cial, industrial, and military temperature range models
are available.
VOUT
Comparator
Input
+VCC
fOUT
–In
One-Shot
+In
VFC32
Common
–VCC
One-Shot
Capacitor
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (602) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (602) 889-1510 • Immediate Product Info: (800) 548-6132
©1977 Burr-Brown Corporation
PDS-372G
Printed in U.S.A. October, 1998
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APPLICATION INFORMATION
Figure 1 shows the basic connection diagram for frequency-
to-voltage conversion. R1 sets the input voltage range. For a
10V full-scale input, a 40kΩ input resistor is recommended.
Other input voltage ranges can be achieved by changing the
value of R1.
R1
=
V FS
0. 25mA
(1)
R1 should be a metal film type for good stability. Manufac-
turing tolerances can produce approximately ±10% variation
in output frequency. Full-scale output frequency can be
trimmed by adjusting the value of R1—see Figure 3.
The full-scale output frequency is determined by C1. Values
shown in Figure 1 are for a full-scale output frequency of
10kHz. Values for other full-scale frequencies can be read
from Figure 2. Any variation in C1—tolerance, temperature
drift, aging—directly affect the output frequency. Ceramic
NPO or silver-mica types are a good choice.
For full-scale frequencies above 200kHz, use larger capaci-
tor values as indicated in Figure 2, with R1 = 20kΩ.
The value of the integrating capacitor, C2, does not directly
influence the output frequency, but its value must be chosen
within certain bounds. Values chosen from Figure 2 produce
approximately 2.5Vp-p integrator voltage waveform. If C2’s
value is made too low, the integrator output voltage can
exceed its linear output swing, resulting in a nonlinear
response. Using C2 values larger than shown in Figure 2 is
acceptable.
Accuracy or temperature stability of C2 is not critical be-
cause its value does not directly affect the output frequency.
For best linearity, however, C2 should have low leakage and
low dielectric absorption. Polycarbonate and other film
capacitors are generally excellent. Many ceramic types are
adequate, but some low-voltage ceramic capacitor types
may degrade nonlinearity. Electrolytic types are not recom-
mended.
FREQUENCY OUTPUT PIN
The frequency output terminal is an open-collector logic
output. A pull-up resistor is usually connected to a 5V logic
supply to create standard logic-level pulses. It can, however,
be connected to any power supply up to +VCC. Output pulses
have a constant duration and positive-going during the one-
shot period. Current flowing in the open-collector output
transistor returns through the Common terminal. This termi-
nal should be connected to logic ground.
R1
40kΩ
VIN
0 to 10V
fO
VINT
C2
10nF film
VINT
+15V
0.1µF
One-Shot
Pull-Up Voltage
0V ≤ VPU ≤ +VCC
+5V
RPU
4.7kΩ
VPU
RPU
≤ 8mA
fOUT
0 to 10kHz
Pinout shown is
for DIP or SOIC
packages.
0.1µF
–15V
FIGURE 1. Voltage-to-Frequency Converter Circuit.
VFC32
C1
3.3nF
NPO Ceramic
5 VFC32
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for VFC32KP electronic component. |
| Information | Total 7 Pages | |
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Featured Datasheets
| Part Number | Description | MFRS |
| VFC32KP | The function is Voltage-to-Frequency and Frequency-to-Voltage CONVERTER. Burr-Brown Corporation | |
| VFC32KU | The function is Voltage-to-Frequency and Frequency-to-Voltage CONVERTER. Burr-Brown Corporation | |
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