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PDF VFC110AG Data sheet ( Hoja de datos )
| Número de pieza | VFC110AG | |
| Descripción | High-Frequency VOLTAGE-TO-FREQUENCY CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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® VFC110
High-Frequency
VOLTAGE-TO-FREQUENCY CONVERTER
FEATURES
q HIGH-FREQUENCY OPERATION:
4MHz FS max
q EXCELLENT LINEARITY:
±0.02% typ at 2MHz
q PRECISION 5V REFERENCE
q DISABLE PIN
q LOW JITTER
APPLICATIONS
q INTEGRATING A/D CONVERSION
q PROCESS CONTROL
q VOLTAGE ISOLATION
q VOLTAGE-CONTROLLED OSCILLATOR
q FM TELEMETRY
DESCRIPTION
The VFC110 voltage-to-frequency converter is a third-
generation VFC offering improved features and per-
formance. These include higher frequency operation,
an on-board precision 5V reference and a Disable
function.
The precision 5V reference can be used for offsetting
the VFC transfer function, as well as exciting trans-
ducers or bridges. The Enable pin allows several
VFCs’ outputs to be paralleled, multiplexed, or simply
to shut off the VFC. The open-collector frequency
output is TTL/CMOS-compatible. The output may be
isolated by using an opto-coupler or transformer.
Internal input resistor, one-shot and integrator capaci-
tors simplify applications circuits. These components
are trimmed for a full-scale output frequency of 4MHz
at 10V input. No additional components are required
for many applications.
The VFC110 is packaged in plastic and ceramic
14-pin DIPs. Industrial and military temperature range
gradeouts are available.
IIN VOUT Comparator
1 12 11
+VS
10
V IN 2
Input Common 14
One-Shot
V REF
8 fOUT
7 Digital Ground
5 Enable
4
13 3
6
–VS
Analog Ground 5V
COS
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
© 1988 Burr-Brown Corporation
PDS-861B
Printed in U.S.A. October, 1993
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
0.02
0.01
0
–0.01
–0.02
0
NONLINEARITY vs INPUT VOLTAGE
1
0.8
0.6
fFS = 4MHz
0.4
0.2
0
–0.2
fFS = 1MHz
–0.4
–0.6
–0.8
–1
1 2 3 4 5 6 7 8 9 10
Input Voltage (V)
OPERATION
Figure 1 shows the connections required for operation at a
full-scale output frequency of 4MHz. Only power supply
bypass capacitors and an output pull-up resistor, RPU, are
required for this mode of operation. A 0V to 10V input
voltage produces a 0Hz to 4MHz output frequency. The
internal input resistor, one-shot and integrator capacitors set
the full-scale output frequency. The input is applied to the
summing junction of the integrator amplifier through the
25kΩ internal input resistor. Pin 14 (the non-inverting ampli-
fier input) should be referred directly to the negative side of
VIN. The common-mode range of the integrating amplifier is
limited to approximately –1V to +1V referred to analog
ground. This allows the non-inverting input to Kelvin-sense
the common connection of VIN, easily accommodating any
NONLINEARITY vs FULL SCALE FREQUENCY
1
0.1
0.01
0.001
10 4
10 5 10 6
Full Scale Frequency (Hz)
10 7
ground-drop errors. The input impedance loading VIN is
equal to the input resistor—approximately 25kΩ.
OPERATION AT LOWER FREQUENCIES
The VFC110 can be operated at lower frequencies simply by
limiting the input voltage to less than the nominal 10V full-
scale input. To maintain a 10V FS input and highest accu-
racy, however, external components are required (see Table
I). Small adjustments may be required in the nominal values
indicated. Integrator and one-shot capacitors are added in
parallel to internal capacitors. Figure 2 shows the connec-
tions required for 100kHz full scale output. The one-shot
capacitor, COS, should be connected to logic ground. The
one-shot connection (pin 6) is not short-circuit protected.
Short-circuits to ground may damage the device.
NC
1
0 to
+10V
VIN
2
14
25kΩ*
12
50pF*
11
+VS
+15V
10
One-Shot
V REF
VL
+5V
RPU
680 Ω
8
fOUT
0 to 4MHz
7 Logic Ground
5 NC
* Nominal Values (±20%)
4
–15V
–VS
FIGURE 1. 4MHz Full-Scale Operation.
13
Analog Ground
3
NC
6
NC
5
VFC110
®
5 Page | ||
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| PDF Descargar | [ Datasheet VFC110AG.PDF ] | |
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