поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

AD4003 датащи(PDF) 6 Page - Analog Devices

номер детали AD4003
подробное описание детали  Devices Connected
Download  13 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD4003 датащи(HTML) 6 Page - Analog Devices

Back Button AD4003 Datasheet HTML 2Page - Analog Devices AD4003 Datasheet HTML 3Page - Analog Devices AD4003 Datasheet HTML 4Page - Analog Devices AD4003 Datasheet HTML 5Page - Analog Devices AD4003 Datasheet HTML 6Page - Analog Devices AD4003 Datasheet HTML 7Page - Analog Devices AD4003 Datasheet HTML 8Page - Analog Devices AD4003 Datasheet HTML 9Page - Analog Devices AD4003 Datasheet HTML 10Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 13 page
background image
CN-0385
Circuit Note
Rev. 0 | Page 6 of 13
Each channel functions similarly to an RC circuit having an
associated time constant that dominates settling time.
Dynamically switching channels complicates signal settling;
at the time channels are switched, the difference between the
previous output and the current input produces a kickback
transient. This kickback is similar to the one that occurs at the
input to the AD4003 as it enters the acquisition phase. For a
more detailed description, see the Analog Dialogue article,
Front-End Amplifier and RC Filter Design for a Precision SAR
Analog-to-Digital Converter.
The circuit in Figure 4 was simulated using NI Multisim™, as
shown in Figure 5, with the following component values from
the respective device data sheets:
RON = 250 Ω
CS = 3.5 pF
CD = 36 pF
RIN||CIN = 1.25 GΩ||2 pF
The input resistance of the AD8251 (RIN) is sufficiently large
(1.25 GΩ) to be omitted from simulation.
Figure 5. Multisim Settling Time Model of the ADG5207
The simulation results are shown in Figure 6. The time required
for the output of the ADG5207 to settle to 0.001% of 10 V is
tS_ADG5207 = 188 ns.
Figure 6. Settling Time Waveforms for the ADG5207 Simulation Model
Settling Time of the AD8251 and AD8475
The AD8251 data sheet specifies its settling time for a variety of
input voltage step sizes down to a 0.001% error for each gain
configuration. Given a load of 10 kΩ and gain setting of 1, the
AD8251 can settle a 20 V step at its output to 0.001% in
approximately 1 μs. The gain of 1 setting requires the most
settling time; therefore, the settling time analysis uses 1 μs.
However, the 1 μs number may not be accurate when the
AD8251 is driving one of the inputs of the AD8475, which has
an input impedance of 2.92 kΩ instead of 10 kΩ. It is also not
possible to ascertain settling time of the AD8251 to 18-bit
resolution, because of the nonlinear relationship between
settling time and precision. Therefore, the best settling time
estimation is 0.001% error (or 16-bit resolution).
The AD8475 has a settling time specification of 50 ns to 0.001%
for a 2 V differential output step. The maximum voltage step size
expected on the outputs of the AD8475 is twice the reference
voltage (VREF), or approximately 8 V. Assuming that the settling
time is proportional to the output voltage step, the settling time to
0.001% (16 bits) for an 8 V step is approximately 200 ns (4 × 50 ns).
The settling time of each amplifier is, therefore,
tS_AD8251 = 1 μs
tS_AD8475 = 200 ns
Settling Time of the RC Noise Filter and AD4003
Figure 7 shows the equivalent circuit of the inputs of the AD4003.
REXT and CEXT are the components in the RC wideband noise
filter in front of the ADC. RIN and CIN are the input resistance
and capacitance of the AD4003, respectively. CIN is mainly the
internal capacitive digital-to-analog converter (DAC). CPIN is
primarily the pin capacitance, and is ignored. The values for
these components are as follows:
REXT = 200 Ω
CEXT = 120 pF
RIN = 400 Ω
CIN = 40 pF
Figure 7. Settling Time Model of the AD4003 and RC Noise Filter
The AD4003 employs an internal capacitive DAC and a charge
redistribution algorithm to determine its output code. The
conversion process contains two phases, acquisition and
conversion. During acquisition, the capacitive DAC is
connected to the input terminals of the AD4003. During
conversion, it is disconnected from the input terminals, and
internal logic performs the charge-redistribution algorithm.
Compared to other PulSAR ADCs, the AD4003 has a much
V2
–10V
XSC1
AB C D
G
T
3.5pF
V1
+10V
CS1OFF
CS2OFF
3.5pF
S1
OUTPUT
MUX CONTROL
+–
1
2
1
2
RON1
250Ω
CD1
36pF
C1
2pF
56pF
56pF
100Ω
100Ω
RON2
250Ω
4
3
2
1
050
100
TIME (ns)
150
200
250
300
–50
0
10
5
0
–5
–10
188ns, +10V
0ns, –10V
OUTPUT (V)
MUX CTR (V)
CPIN
REF
RIN
CIN
D1
D2
IN+ OR IN–
GND
GND
GND
REXT
EXT
AD4003


Аналогичный номер детали - AD4003

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD4003 AD-AD4003 Datasheet
1Mb / 34P
   18-Bit, 2 MSPS Precision SAR Differential ADC
AD4003 AD-AD4003 Datasheet
1Mb / 38P
   Precision, Differential SAR ADCs
AD4003 AD-AD4003 Datasheet
3Mb / 34P
   36V Fully-Differential Programmable-Gain Instrumentation Amplifier with 25pA Input Bias Current
AD4003BCPZ-RL7 AD-AD4003BCPZ-RL7 Datasheet
1Mb / 34P
   18-Bit, 2 MSPS Precision SAR Differential ADC
AD4003BCPZ-RL7 AD-AD4003BCPZ-RL7 Datasheet
1Mb / 38P
   Precision, Differential SAR ADCs
More results

Аналогичное описание - AD4003

производительномер деталидатащиподробное описание детали
logo
Analog Devices
CN0221 AD-CN0221 Datasheet
418Kb / 5P
   Devices Connected
CN0216 AD-CN0216 Datasheet
603Kb / 5P
   Devices Connected
CN0253 AD-CN0253 Datasheet
135Kb / 4P
   Devices Connected
CN0357 AD-CN0357 Datasheet
223Kb / 5P
   Devices Connected
CN0388 AD-CN0388 Datasheet
503Kb / 5P
   Devices Connected
CN0269 AD-CN0269 Datasheet
1Mb / 12P
   Devices Connected
CN0267 AD-CN0267 Datasheet
336Kb / 8P
   Devices Connected
CN0287 AD-CN0287 Datasheet
476Kb / 9P
   Devices Connected
CN0326 AD-CN0326 Datasheet
519Kb / 7P
   Devices Connected
CN0336 AD-CN0336 Datasheet
301Kb / 7P
   Devices Connected
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13


датащи скачать

Go To PDF Page


ссылки URL




Конфиденциальность
ALLDATASHEETRU.COM
Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   обмен ссыками   |   поиск по производителю
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