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ADS7863ARGET Datasheet(PDF) 29 Page - Texas Instruments

Part # ADS7863ARGET
Description  Dual, 2-MSPS, 12-Bit, 2 2 or 3 3 Channel, Simultaneous-Sampling, Analog-to-Digital Converter
PDF  42 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

ADS7863ARGET Datasheet(HTML) 29 Page - Texas Instruments

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R=
t
ACQ
ln(2)
2
(n+1)
C
´
´
´
f
=
FILTER
ln(2)
(n+1)
´
2
2
R
p ´
C
´
´
´
BGND
CHB1+
CHB1-
CHB0+
CHB0-
CHA1+
CHA1-
CHA0+
CHA0-
REF
IN
REF
OUT
AGND
1
2
BGND
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
BV
DD
SDOA
SDOB
BUSY
CLOCK
CS
RD
CONVST
SDI
M0
M1
AV
DD
ADS7863A
AGND
AGND
AGND
AGND
OPA2365
AGND
OPA2365
0.1 F
m
1 F
m
1 F
m
0.1 F (min)
m
BV
DD
AV
DD
OPA2365
AV
DD
OPA2365
470 nF
(min)
BV
DD
BGND
BGND
Controller
Device
ADS7863A
www.ti.com
SBAS610 – DECEMBER 2013
APPLICATION INFORMATION
The absolute minimum configuration of the ADS7863A is shown in Figure 42. In this case, the ADS7863A is
used in dual-channel mode only, with the default settings of the device after power up.
The input signal for the amplifiers must fulfill the common-mode voltage requirements of the ADS7863A in this
configuration. The actual values of the resistors and capacitors depend on the bandwidth and performance
requirements of the application.
Figure 42. Minimum ADS7863A Configuration
These values can be calculated using Equation 3, with n = 12 is the device resolution of the ADS7863A.
where:
•
n = 12 is the resolution of the ADS7863A
(3)
TI recommends using a capacitor value of at least 20 pF.
Keep the acquisition time in mind; the resistor value can be calculated as shown in Equation 4 for each of the
series resistors.
where:
•
n = 12 is the resolution of the ADS7863A
(4)
Copyright © 2013, Texas Instruments Incorporated
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