Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

AD650SD-883B Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças AD650SD-883B
Descrição Electrónicos  Voltage-to-Frequency and Frequency-to-Voltage Converter
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD650SD-883B Folha de dados(HTML) 10 Page - Analog Devices

Back Button AD650SD-883B Datasheet HTML 6Page - Analog Devices AD650SD-883B Datasheet HTML 7Page - Analog Devices AD650SD-883B Datasheet HTML 8Page - Analog Devices AD650SD-883B Datasheet HTML 9Page - Analog Devices AD650SD-883B Datasheet HTML 10Page - Analog Devices AD650SD-883B Datasheet HTML 11Page - Analog Devices AD650SD-883B Datasheet HTML 12Page - Analog Devices AD650SD-883B Datasheet HTML 13Page - Analog Devices AD650SD-883B Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 20 page
background image
AD650
Data Sheet
Rev. E | Page 10 of 20
BIPOLAR V/F
Figure 11 shows how the internal bipolar current sink is used to
provide a half-scale offset for a ±5 V signal range, while providing
a 100 kHz maximum output frequency. The nominally 0.5 mA
(±10%) offset current sink is enabled when a 1.24 kΩ resistor is
connected between Pin 4 and Pin 5. Thus, with the grounded
10 kΩ nominal resistance shown, a −5 V offset is developed at
Pin 2. Because Pin 3 must also be at −5 V, the current through RIN
is 10 V/40 kΩ = +0.25 mA at VIN = +5 V, and 0 mA at VIN = –5 V.
Components are selected using the same guidelines outlined for
the unipolar configuration with one alteration. The voltage
across the total signal range must be equated to the maximum
input voltage in the unipolar configuration. In other words, the
value of the input resistor RIN is determined by the input voltage
span, not the maximum input voltage. A diode from Pin 1 to
ground is also recommended. This is further discussed in the
Other Circuit Considerations section.
As in the unipolar circuit, RIN and COS must have low temperature
coefficients to minimize the overall gain drift. The 1.24 kΩ
resistor used to activate the 0.5 mA offset current should also
have a low temperature coefficient. The bipolar offset current
has a temperature coefficient of approximately −200 ppm/°C.
UNIPOLAR V/F, NEGATIVE INPUT VOLTAGE
Figure 12 shows the connection diagram for V/F conversion of
negative input voltages. In this configuration, full-scale output
frequency occurs at negative full-scale input, and zero output
frequency corresponds with zero input voltage.
A very high impedance signal source can be used because it only
drives the noninverting integrator input. Typical input impedance
at this terminal is 1 GΩ or higher. For V/F conversion of positive
input signals using the connection diagram of Figure 4, the
signal generator must be able to source the integration current
to drive the AD650. For the negative V/F conversion circuit of
Figure 12, the integration current is drawn from ground
through R1 and R3, and the active input is high impedance.
Circuit operation for negative input voltages is very similar to
positive input unipolar conversion described in the Unipolar
Configuration section. For best operating results use Equation 7
and Equation 8 in the Component Selection section.
F/V CONVERSION
The AD650 also makes a very linear frequency-to-voltage
converter. Figure 13 shows the connection diagram for F/V
conversion with TTL input logic levels. Each time the input
signal crosses the comparator threshold going negative, the one
shot is activated and switches 1 mA into the integrator input for
a measured time period (determined by COS). As the frequency
increases, the amount of charge injected into the integration
capacitor increases proportionately. The voltage across the
integration capacitor is stabilized when the leakage current
through R1 and R3 equals the average current being switched
into the integrator. The net result of these two effects is an
average output voltage that is proportional to the input
frequency. Optimum performance can be obtained by selecting
components using the same guidelines and equations listed in
the Bipolar V/F section.
For a more complete description of this application, refer to
Analog Devices’ Application Note AN-279.
HIGH FREQUENCY OPERATION
Proper RF techniques must be observed when operating the
AD650 at or near its maximum frequency of 1 MHz. Lead
lengths must be kept as short as possible, especially on the one
shot and integration capacitors, and at the integrator summing
junction. In addition, at maximum output frequencies above
500 kHz, a 3.6 kΩ pull-down resistor from Pin 1 to −VS is
required (see Figure 14). The additional current drawn through
the pulldown resistor reduces the op amp’s output impedance
and improves its transient response.
OP
AMP
COMP
IN
FREQ
OUT
OUT
ONE
SHOT
8
9
10
11
13
12
7
6
5
4
3
2
1
14
INPUT
OFFSET
TRIM
–0.6V
AD650
–VS
–VS
1mA
S1
COS
330pF
–15V
0.1µF
VIN
±5V
1.24kΩ
R3
37.4kΩ
10kΩ
R1
5kΩ
CINT
1000pF
20kΩ
250kΩ
0.1µF
1µF
1kΩ
+15V
+5V
DIGITAL
GND
ANALOG
GND
FOUT
Figure 11. Connections for ±5 V Bipolar V/F with 0 kHz to 100 kHz TTL Output


Nº de peça semelhante - AD650SD-883B

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Analog Devices
AD650SD AD-AD650SD Datasheet
284Kb / 12P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
REV. C
AD650SD AD-AD650SD Datasheet
392Kb / 20P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
Rev. E
AD650SD AD-AD650SD Datasheet
449Kb / 21P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
AD650SD/883B AD-AD650SD/883B Datasheet
449Kb / 21P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
More results

Descrição semelhante - AD650SD-883B

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
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
Rev. B
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
ADVFC32 AD-ADVFC32_17 Datasheet
375Kb / 7P
   Voltage-to-Frequency and Frequency-to-Voltage Converter
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 8 9 10 11 12 13 14 15 16 17 18 19 20


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
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