Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

AD7982 Datasheet(PDF) 20 Page - Analog Devices

Part No. AD7982
Description  Precision, Selectable Gain, Fully Differential Funnel Amplifier
Download  24 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7982 Datasheet(HTML) 20 Page - Analog Devices

Back Button AD7982 Datasheet HTML 16Page - Analog Devices AD7982 Datasheet HTML 17Page - Analog Devices AD7982 Datasheet HTML 18Page - Analog Devices AD7982 Datasheet HTML 19Page - Analog Devices AD7982 Datasheet HTML 20Page - Analog Devices AD7982 Datasheet HTML 21Page - Analog Devices AD7982 Datasheet HTML 22Page - Analog Devices AD7982 Datasheet HTML 23Page - Analog Devices AD7982 Datasheet HTML 24Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 20 / 24 page
background image
AD8475
Rev. B | Page 20 of 24
12
11
10
1
3
4
NC
–OUT
+OUT
9
VOCM
+IN 0.4x
–IN 0.8x
2
+IN 0.8x
–IN 0.4x
1kΩ
1.25kΩ
1.25kΩ
1kΩ
AD8475
1.25kΩ
1.25kΩ
+VS
–VS
0.1µF
VOUT = (V+OUT – V–OUT)
REF
+
0.1µF
10µF
LOW
IMPEDANCE
INPUT SOURCE
VIN
0.1µF
10µF
Figure 53. Typical Configuration—16-Lead LFCSP
HIGH PERFORMANCE ADC DRIVING
The AD8475 is ideally suited for broadband dc-coupled and
industrial applications. The circuit in Figure 55 shows an
industrial front-end connection for an AD8475 driving an
AD7982, a 18-bit, 1 MSPS ADC, with dc coupling on the
AD8475 input and output. (The AD7982 achieves its optimum
performance when driven differentially.) The AD8475 performs
the attenuation of a 20 V p-p input signal, level shifts it, and
converts it to a differential signal without the need for any
external components. The AD8475 eliminates the need for dual
supplies at the front end to accept large bipolar signals. It also
eliminates the need for a precision resistor network for attenua-
tion, and a transformer to drive the ADC and perform the single-
ended-to-differential conversion.
The ac and dc performance of the AD8475 are compatible with
the 18-bit, 1 MSPS AD7982 PulSAR® ADC and other 16-bit and
18-bit members of the family, which have sampling rates up to
4 MSPS. Some suitable high performance differential ADCs are
listed in Table 6.
Table 6. High Performance SAR ADCs
Part
Resolution
Sample
Rate
Description
AD7984
18 Bits
1.33 MSPS
True differential input,
14 mW, 2.5 V ADC
AD7982
18 Bits
1 MSPS
True differential Input,
7.0 mW, 2.5 V ADC
AD7690
18 Bits
400 kSPS
True differential input,
4.5 mW, 5 V ADC
AD7641
18 Bits
2 MSPS
True differential input,
75 mW, 2.5 V ADC
In this example, the AD8475 is powered with a single 5 V
supply and used in a gain of 0.4, with a single-ended input
converted to a differential output. The input is a 20 V p-p
symmetric, ground-referenced bipolar signal. With an output
common-mode voltage of 2.5 V, each AD8475 output swings
between 0.5 V and 4.5 V, opposite in phase, providing an 8 V p-p
differential signal to the ADC input.


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 


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   |   Alldatasheet API   |   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