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ADVFC32 Fiches technique(PDF) 4 Page - Analog Devices

No de pièce ADVFC32
Description  Voltage-to-Frequency and Frequency-to-Voltage Converter
Download  7 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADVFC32 Fiches technique(HTML) 4 Page - Analog Devices

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REV. B
–3–
ADVFC32
UNIPOLAR V/F, POSITIVE INPUT VOLTAGE
When operated as a V/F converter, the transformation from
voltage to frequency is based on a comparison of input signal
magnitude to the 1 mA internal current source.
A more complete understanding of the ADVFC32 requires a
close examination of the internal circuitry of this part. Consider
the operation of the ADVFC32 when connected as shown in
Figure 1. At the start of a cycle, a current proportional to the
Figure 1. Connection Diagram for V/F Conversion,
Positive Input Voltage
input voltage flows through R3 and R1 to charge integration
capacitor C2. As charge builds up on C2, the output voltage of
the input amplifier decreases. When the amplifier output volt-
age (Pin 13) crosses ground (see Figure 2 at time t1), the
comparator triggers a one shot whose time period is determined
by capacitor C1. Specifically, the one shot time period (in nano-
seconds) is:
tOS
≅ (C
l + 44 pF)
× 6.7 kΩ
Figure 2. Voltage-to-Frequency Conversion Waveforms
During this period, a current of (1 mA – IIN) flows out of the
integration capacitor. The total amount of charge depleted
during one cycle is, therefore (1 mA – IIN)
× t
OS. This charge is
replaced during the remainder of the cycle to return the integra-
tor to its original voltage. Since the charge taken out of C2 is
equal to the charge that is put on C2 every cycle,
(1 mA – IIN)
× t
OS = IIN
×
1
F
OUT
– t
OS


or, rearranging terms,
FOUT =
I
IN
1 mA
× t
OS
The complete transfer equation can now be derived by substi-
tuting IIN = VIN/RIN and the equation relating C1 and tOS. The
final equation describing ADVFC32 operation is:
VIIN / RIN
1mA
× C
1
+ 44 pF
()×6.7kΩ
Components should be selected to optimize performance over
the desired input voltage and output frequency range using the
equations listed below:
3.7
×107 pF / sec
FOUT FS
– 44 pF
C2 =
10
–4 Farads / sec
F
OUT FS
1000 pF minimum
()
RIN =
VIN FS
0.25 mA
R2
+V
LOGIC
8 mA
Both RIN and C1 should have very low temperature coefficients
as changes in their values will result in a proportionate change
in the V/F transfer function. Other component values and tem-
perature coefficients are not critical.
Table I. Suggested Values for C1, RIN and C2
VIN FS
FOUT FS
C1
RIN
C2
1 V
10 kHz
3650 pF
4.0 k
0.01
µF
10 V
10 kHz
3650 pF
40 k
0.01
µF
1 V
100 kHz
330 pF
4.0 k
1000 pF
10 V
100 kHz
330 pF
40 k
1000 pF
ORDERING GUIDE
Part
Gain Tempco
Temp Range
Package
Number
1
ppm/ C
C
Option
ADVFC32KN
±75 typ
0 to 70
14-Pin
Plastic DIP
ADVFC32BH
±100 max
–25 to +85
TO-100
ADVFC32SH
±150 max
–55 to +125
TO-100
NOTE
1For details on grade and package offerings screened in accordance with MIL-STD-883,
refer to the Analog Devices Military Products Databook or current ADVFC32/883B
data sheet.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADVFC32 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE


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