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AD650JNZ Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD650JNZ
Szczegółowy opis  Voltage-to-Frequency and Frequency-to-Voltage Converter
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD650JNZ Arkusz danych(HTML) 10 Page - Analog Devices

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Data Sheet
AD650
Rev. E | Page 9 of 20
If the approximate amount of noise that appears on CINT is known
(VNOISE), then the value of CINT can be checked using the following
inequality:
NOISE
S
OS
INT
V
V
A
t
C
V
3
10
1
3
(8)
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 RIN and 1000 pF for COS. This results
in a one-shot time period of approximately 7 μs. Substituting
75 kHz into Equation 7 yields a value of 1300 pF for CINT. When
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 CINT to increase by approximately 5.5 V.
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 CINT to 1500 pF or 2000 pF
provides much more noise margin, thereby eliminating this
potential trouble spot.
1MHz
100kHz
10kHz
50
100
1000
COS (pF)
INPUT
RESISTOR
16.9k
20k
40.2k
100k
Figure 9. Full-Scale Frequency vs. COS
100
20
50
100
1000
ONE SHOT CAPACITOR
COS (pF)
1000
INPUT
RESISTOR
16.9k
40.2k
100k
20k
Figure 10. Typical Nonlinearity vs. COS


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