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

X  

AD712KN Folha de dados(PDF) 11 Page - Analog Devices

Nome de Peças AD712KN
Descrição Electrónicos  Dual Precision, Low Cost, High Speed BiFET Op Amp
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

AD712KN Folha de dados(HTML) 11 Page - Analog Devices

Back Button AD712KN Datasheet HTML 7Page - Analog Devices AD712KN Datasheet HTML 8Page - Analog Devices AD712KN Datasheet HTML 9Page - Analog Devices AD712KN Datasheet HTML 10Page - Analog Devices AD712KN Datasheet HTML 11Page - Analog Devices AD712KN Datasheet HTML 12Page - Analog Devices AD712KN Datasheet HTML 13Page - Analog Devices AD712KN Datasheet HTML 14Page - Analog Devices AD712KN Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 20 page
background image
AD712
Rev. G | Page 11 of 20
)
SETTLING TIME
OPTIMIZING SETTLING TIME
Most bipolar high speed digital-to-analog converters (DACs)
have current outputs; therefore, for most applications, an
external op amp is required for a current-to-voltage conversion.
The settling time of the converter/op amp combination depends
on the settling time of the DAC and output amplifier. A good
approximation is
() (
2
2
AMP
t
DAC
t
Total
t
S
S
S
+
=
The settling time of an op amp DAC buffer varies with the noise
gain of the circuit, the DAC output capacitance, and the amount
of external compensation capacitance across the DAC output
scaling resistor.
Settling time for a bipolar DAC is typically 100 ns to 500 ns.
Previously, conventional op amps have required much longer
settling times than have typical state-of-the-art DACs; therefore,
the amplifier settling time has been the major limitation to a
high speed, voltage output, digital-to-analog function. The
introduction of the AD71x family of op amps with their 1 μs (to
±0.01% of final value) settling time permits the full high speed
capabilities of most modern DACs to be realized.
In addition to a significant improvement in settling time, the
low offset voltage, low offset voltage drift, and high open-loop
gain of the AD71x family assure 12-bit accuracy over the full
operating temperature range.
The excellent high speed performance of the AD712 is shown in
the oscilloscope photos in Figure 30 and Figure 31. Measure-
ments were taken using a low input capacitance amplifier
connected directly to the summing junction of the AD712 and
both figures show a worst-case situation: full-scale input
transition. The 4 kΩ [10 kΩ||8 kΩ = 4.4 kΩ] output impedance
of the DAC, together with a 10 kΩ feedback resistor, produce an
op amp noise gain of 3.25. The current output from the DAC
produces a 10 V step at the op amp output (0 to −10 V shown in
Figure 30, and −10 V to 0 V shown in Figure 31).
Therefore, with an ideal op amp, settling to ±1/2 LSB (±0.01%)
requires that 375 μV or less appears at the summing junction.
This means that the error between the input and output (that
voltage which appears at the AD712 summing junction) must
be less than 375 μV. As shown in Figure 30, the total settling
time for the AD712/AD565A combination is 1.2 microseconds.
+15V
0.1µF
0.1µF
10pF
OUTPUT
–10V TO +10V
AD565A
–15V
IREF
BIPOLAR
OFFSET ADJUST
IO
0.1µF
R1
100Ω
R2
100Ω
GAIN
ADJUST
REF
IN
REF
GND
–VEE
0.1µF
POWER
GND
MSB
LSB
8kΩ
5kΩ
5kΩ
10V
19.95kΩ
0.5mA
DAC
OUT
10V
SPAN
20V
SPAN
VCC
REF
OUT
BIPOLAR
OFF
9.95kΩ
+
8
4
1/2
AD712
DAC
IOUT = 4 ×
IREF × CODE
20kΩ
Figure 29. ±10 V Voltage Output Bipolar DAC


Nº de peça semelhante - AD712KN

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Analog Devices
AD712KN AD-AD712KN Datasheet
635Kb / 15P
   Dual Precision, Low Cost, High Speed, BiFET Op Amp
REV. B
More results

Descrição semelhante - AD712KN

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Analog Devices
AD712 AD-AD712 Datasheet
635Kb / 15P
   Dual Precision, Low Cost, High Speed, BiFET Op Amp
REV. B
AD712 AD-AD712_15 Datasheet
387Kb / 20P
   Precision, Low Cost, High Speed BiFET Dual Op Amp
Rev. H
AD711JRZ AD-AD711JRZ Datasheet
543Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711 AD-AD711_15 Datasheet
717Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711 AD-AD711 Datasheet
523Kb / 12P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. A
AD711SH AD-AD711SH Datasheet
543Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711 AD-AD711_02 Datasheet
592Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711JNZ AD-AD711JNZ Datasheet
717Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD642 AD-AD642 Datasheet
395Kb / 6P
   Precision, Low Cost Dual BiFET Op Amp
REV. 0
AD642 AD-AD642_15 Datasheet
399Kb / 6P
   Precision, Low Cost Dual BiFET Op Amp
REV. 0
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