Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

AD7674 Datasheet(PDF) 19 Page - Analog Devices

Part No. AD7674
Description  18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7674 Datasheet(HTML) 19 Page - Analog Devices

Back Button AD7674 Datasheet HTML 15Page - Analog Devices AD7674 Datasheet HTML 16Page - Analog Devices AD7674 Datasheet HTML 17Page - Analog Devices AD7674 Datasheet HTML 18Page - Analog Devices AD7674 Datasheet HTML 19Page - Analog Devices AD7674 Datasheet HTML 20Page - Analog Devices AD7674 Datasheet HTML 21Page - Analog Devices AD7674 Datasheet HTML 22Page - Analog Devices AD7674 Datasheet HTML 23Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 19 / 28 page
background image
AD7674
Rev. 0 | Page 19 of 28
U2
8.25k
2.5V
AD8021
590
AD7674
IN+
IN– REF
U1
ANALOG INPUT
(UNIPOLAR
0V TO 4.096V)
10pF
AD8021
590
10pF
10
µF
100nF
1.82k
2.7nF
15
2.7nF
15
REFBUFIN
03083-0-031
The SNR degradation due to the amplifier is


=
π
+
2
)
(
625
25
log
20
N
3dB
LOSS
Ne
f
SNR
where:
f–3dB is the –3 dB input bandwidth in MHz of the AD7674
(26 MHz) or the cutoff frequency of the input filter, if used.
N is the noise factor of the amplifiers (1 if in buffer
configuration).
eN is the equivalent input noise voltage of each op amp in
nV/√Hz.
Figure 31. Single-Ended-to-Differential Driver Circuit
(Internal Reference Buffer Used)
Voltage Reference
For instance, for a driver with an equivalent input noise of
2 nV/√Hz (e.g., AD8021) configured as a buffer, thus with a
noise gain of +1, the SNR degrades by only 0.34 dB with
the filter in Figure 27, and by 1.8 dB without it.
The AD7674 allows the use of an external voltage reference
either with or without the internal reference buffer.
Using the internal reference buffer is recommended when
sharing a common reference voltage between multiple ADCs is
desired.
The driver needs to have a THD performance suitable to
that of the AD7674.
However, the advantages of using the external reference voltage
directly are:
The AD8021 meets these requirements and is usually
appropriate for almost all applications. The AD8021 needs a
10 pF external compensation capacitor, which should have good
linearity as an NPO ceramic or mica type.
The SNR and dynamic range improvement (about 1.7 dB)
resulting from the use of a reference voltage very close to
the supply (5 V) instead of a typical 4.096 V reference when
the internal buffer is used
The AD8022 could be used if a dual version is needed and gain
of 1 is present. The AD829 is an alternative in applications
where high frequency (above 100 kHz) performance is not
required. In gain of 1 applications, it requires an 82 pF
compensation capacitor. The AD8610 is another option when
low bias current is needed in low frequency applications.
The power saving when the internal reference buffer is
powered down (PDBUF High)
To use the internal reference buffer, PDBUF should be LOW. A
2.5 V reference voltage applied on the REFBUFIN input will
result in a 4.096 V reference on the REF pin.
Single-to-Differential Driver
For applications using unipolar analog signals, a single-ended-
to-differential driver will allow for a differential input into the
part. The schematic is shown in Figure 31. When provided an
input signal of 0 to VREF, this configuration will produce a
differential ±VREF with midscale at VREF/2.
In both cases, the voltage reference input REF has a dynamic
input impedance and therefore requires an efficient decoupling
between REF and REFGND inputs, The decoupling consists of a
low ESR 47 µF tantalum capacitor connected to the REF and
REFGND inputs with minimum parasitic inductance.
If the application can tolerate more noise, the AD8138
differential driver can be used.
Care should also be taken with the reference temperature
coefficient of the voltage reference, which directly affects the
full-scale accuracy if this parameter matters. For instance, a
±4 ppm/°C temperature coefficient of the reference changes the
full scale by ±1 LSB/°C.


Similar Part No. - AD7674

ManufacturerPart No.DatasheetDescription
Analog Devices
Analog Devices
AD7674 AD-AD7674 Datasheet
818Kb / 32P
   16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC
REV. 0
AD7674 AD-AD7674 Datasheet
983Kb / 28P
   18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
Rev. A
AD7674 AD-AD7674 Datasheet
820Kb / 32P
   16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC
REV. 0
AD7674 AD-AD7674 Datasheet
426Kb / 24P
   16-Bit, 250 kSPS CMOS ADC
REV. B
AD7674 AD-AD7674 Datasheet
868Kb / 32P
   14-Bit, 1 MSPS, Differential, Programmable Input PulSAR ADC
REV. 0
More results

Similar Description - AD7674

ManufacturerPart No.DatasheetDescription
Analog Devices
Analog Devices
AD7674 AD-AD7674_17 Datasheet
587Kb / 29P
   18-Bit, 2.5 LSB INL, 800 kSPS, SAR ADC
AD7674ACP AD-AD7674ACP Datasheet
983Kb / 28P
   18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
Rev. A
AD7674 AD-AD7674_15 Datasheet
1,012Kb / 28P
   18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
REV. A
AD7674AST AD-AD7674AST Datasheet
983Kb / 28P
   18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
Rev. A
AD7679 AD-AD7679 Datasheet
556Kb / 28P
   18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC
REV. 0
AD7678 AD-AD7678_15 Datasheet
362Kb / 28P
   18-Bit, 2.5 LSB INL, 100 kSPS SAR ADC
REV. A
AD7679 AD-AD7679_15 Datasheet
620Kb / 28P
   18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC
REV. A
AD7679 AD-AD7679_17 Datasheet
506Kb / 29P
   18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC
AD7679ASTZ AD-AD7679ASTZ Datasheet
620Kb / 28P
   18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC
REV. A
AD7678 AD-AD7678 Datasheet
437Kb / 29P
   18-Bit, 2.5 LSB INL, 100 kSPS SAR ADC
More results


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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