AD650SD/883B Analog Devices Inc, AD650SD/883B Datasheet - Page 9

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AD650SD/883B

Manufacturer Part Number
AD650SD/883B
Description
IC,Voltage-to-Frequency Converter,BIPOLAR,DIP,14PIN
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD650SD/883B

Converter Function
VFC/FVC
Full Scale Frequency
1000
Power Supply Requirement
Dual
Single Supply Voltage (typ)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Single Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (min)
±9V
Dual Supply Voltage (max)
±18V
Operating Temperature (min)
-55
Operating Temperature (max)
125C
Operating Temperature Classification
Military
Package Type
SBCDIP
Lead Free Status / Rohs Status
Not Compliant

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If the approximate amount of noise that appears on C
(V
inequality:
For example, consider an application calling for a maximum
frequency of 75 kHz, a 0 V to 1 V signal range, and supply
voltages of only ±9 V. The component selection guide of Figure 9
is used to select 2.0 kΩ for R
in a one-shot time period of approximately 7 μs. Substituting
75 kHz into Equation 7 yields a value of 1300 pF for C
the input signal is near zero, 1 mA flows through the integration
capacitor to the switched current sink during the reset phase,
causing the voltage across C
Because the integrator output stage requires approximately 3 V
headroom for proper operation, only 0.5 V margin remains for
integrating extraneous noise on the signal line. A negative noise
pulse at this time could saturate the integrator, causing an error
in signal integration. Increasing C
provides much more noise margin, thereby eliminating this
potential trouble spot.
NOISE
C
), then the value of C
INT
>
+
t
V
OS
S
×
3
1
V
×
10
V
3
NOISE
INT
INT
A
IN
can be checked using the following
to increase by approximately 5.5 V.
and 1000 pF for C
INT
to 1500 pF or 2000 pF
OS
. This results
INT
INT
is known
. When
Rev. D | Page 9 of 20
(8)
100kHz
10kHz
1MHz
1000
100
20
INPUT
RESISTOR
Figure 10. Typical Nonlinearity vs. C
Figure 9. Full-Scale Frequency vs. C
16.9k
40.2k
100k
50
20k
50
100
ONE SHOT CAPACITOR
100
C
OS
C
(pF)
OS
(pF)
1000
1000
OS
OS
INPUT
RESISTOR
16.9k
20k
40.2k
100k
AD650

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