Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

ADVFC32 Fiches technique(PDF) 6 Page - Analog Devices

No de pièce ADVFC32
Description  Voltage-to-Frequency and Frequency-to-Voltage Converter
Download  7 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADVFC32 Fiches technique(HTML) 6 Page - Analog Devices

  ADVFC32 Datasheet HTML 1Page - Analog Devices ADVFC32 Datasheet HTML 2Page - Analog Devices ADVFC32 Datasheet HTML 3Page - Analog Devices ADVFC32 Datasheet HTML 4Page - Analog Devices ADVFC32 Datasheet HTML 5Page - Analog Devices ADVFC32 Datasheet HTML 6Page - Analog Devices ADVFC32 Datasheet HTML 7Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 6 / 7 page
background image
REV. B
ADVFC32
–5–
application of Figure 2, a 10 ppm/
°C input resistor used with a
100 ppm/
°C capacitor may result in a maximum overall circuit
gain drift of:
100 ppm/
°C (ADVFC32BH) + 100 ppm/°C (C1)
+ 10 ppm/
°C (R
IN) = 210 ppm/
°C
Although RIN and C1 have the most pronounced effect on tem-
perature stability, the offset circuit of resistors R4 and R5 may
also have a slight effect on the offset temperature drift of the
circuit. The offset will change with variations in the resistance of
R4 and supply voltage changes. In most applications the offset
adjustment is very small, and the offset drift attributable to this
circuit will be negligible. In the bipolar mode, however, both the
positive reference and the resistor used to offset the signal range
will have a pronounced effect on offset drift. A high quality refer-
ence and resistor should be used to minimize offset drift errors.
Other circuit components do not directly influence temperature
performance as long as their actual values are not so different
from nominal value as to preclude operation. This includes
integration capacitor C2. A change in the capacitance value of
C2 results in a different rate of voltage change across C2, but
this is compensated by an equal effect when C2 is discharged
by the switched 1 mA current source so that no net effect occurs.
The temperature effects of the components described above are
the same when the ADVFC32 is configured for negative or
bipolar input ranges, or F/V conversion.
OTHER CIRCUIT CONSIDERATIONS
The input amplifier connected to Pins 1, 13, and 14 is not a
standard operational amplifier. Although it operates like an op
amp in most applications, two key differences should be noted.
First, the bias current of the positive input is typically 40 nA
while the bias current of the inverting input is
±8 nA. Therefore,
any attempt to cancel input offset voltage due to bias currents
by matching input resistors will create worse offsets. Second, the
output of this amplifier will sink only 1 mA, even though it will
source as much as 10 mA. When used in the F/V mode, the
amplifier must be buffered if large sink currents are required.
MICROPROCESSOR OPERATED A/D CONVERTER
With the addition of a few external components the ADVFC32
can be used as a
±10 V A/D microprocessor front end. Although
the nonlinearity of the ADVFC32 is only 0.05% maximum
(0.01% typ), the resolution is much higher, allowing it to be
used in 16-bit measurement and control systems where a mono-
tonic transfer function is essential. The resolution of the circuit
shown in Figure 5 is dependent on the amount of time allowed
to count the ADVFC32 frequency output. Using a full-scale
frequency of 100 kHz, an 8-bit conversion can be made in about
10 ms, and a 2 second time period allows a 16-bit measurement,
including offset and gain calibration cycles.
As shown in Figure 5, the input signal is selected via the AD7590
input multiplexer. Positive and negative references as well as a
ground input are provided to calibrate the A/D. This is very
important in systems subject to moderate or extreme temperature
changes since the gain temperature coefficient of the ADVFC32
is as high as
±150 ppm/°C. By using the calibration cycles, the
A/D conversion will be as accurate as the references provided.
The AD542 following the input multiplexer provides a high
impedance input (10
12 ohms) and buffers the switch resistance
from the relatively low impedance ADVFC32 input.
If higher linearity is required, the ADVFC32 can be operated at
10 kHz, but this will require a proportionately longer conversion
time. Conversely, the conversion time can be decreased at the
expense of nonlinearity by increasing the maximum frequency to
as high as 500 kHz.
HIGH NOISE IMMUNITY, HIGH CMRR ANALOG
DATA LINK
In many applications, a signal must be sensed at a remote site
and sent through a very noisy environment to a central location
for further processing. In these cases, even a shielded cable may
not protect the signal from noise pickup. The circuit of Figure 6
provides a solution in these cases. Due to the optocoupler and
voltage-to-frequency conversion, this data link is extremely
insensitive to noise and common-mode voltage interference. For
even more protection, an optical fiber link substituted for the
HCPL2630 will provide common-mode rejection of more than
several hundred kilovolts and virtually total immunity to electrical
noise. For most applications, however, the frequency modulated
signal has sufficient noise immunity without using an optical fiber
link, and the optocoupler provides common-mode isolation up
to 3000 V dc.
Figure 5. High Resolution, Self-Calibrating, Microprocessor Operated A/D Converter


Numéro de pièce similaire - ADVFC32

FabricantNo de pièceFiches techniqueDescription
logo
Analog Devices
ADVFC32 AD-ADVFC32 Datasheet
141Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. A
ADVFC32 AD-ADVFC32 Datasheet
345Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. B
ADVFC32 AD-ADVFC32 Datasheet
345Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
ADVFC32BH AD-ADVFC32BH Datasheet
141Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. A
ADVFC32KN AD-ADVFC32KN Datasheet
141Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. A
More results

Description similaire - ADVFC32

FabricantNo de pièceFiches techniqueDescription
logo
Burr-Brown (TI)
VFC32 BURR-BROWN-VFC32 Datasheet
76Kb / 7P
   Voltage-to-Frequency and Frequency-to-Voltage CONVERTER
logo
Analog Devices
AD650 AD-AD650_17 Datasheet
449Kb / 21P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
ADVFC32 AD-ADVFC32_15 Datasheet
345Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
logo
Texas Instruments
VFC32 TI1-VFC32 Datasheet
411Kb / 11P
[Old version datasheet]   Voltage-to-Frequency and Frequency-to-Voltage CONVERTER
logo
Analog Devices
ADVFC32 AD-ADVFC32 Datasheet
141Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. A
AD650 AD-AD650 Datasheet
284Kb / 12P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. C
logo
Burr-Brown (TI)
VFC320 BURR-BROWN-VFC320 Datasheet
122Kb / 9P
   Voltage-to-Frequency and Frequency-to-Voltage CONVERTER
logo
Analog Devices
AD650 AD-AD650_15 Datasheet
392Kb / 20P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. E
ADVFC32KNZ AD-ADVFC32KNZ Datasheet
345Kb / 6P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. B
logo
Texas Instruments
VFC320 TI-VFC320 Datasheet
233Kb / 12P
[Old version datasheet]   Voltage-to-Frequency and Frequency-to-Voltage CONVERTER
More results


Html Pages

1 2 3 4 5 6 7


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com