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9 Application and Implementation
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI's customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The ADS8664 and ADS8668 devices are fully-integrated data acquisition systems based on a 12-bit SAR ADC.
The devices include an integrated analog front-end for each input channel and an integrated precision reference
with a buffer. As such, this device family does not require any additional external circuits for driving the reference
or analog input pins of the ADC.
9.2 Typical Applications
9.2.1 Phase-Compensated, 8-Channel, Multiplexed Data Acquisition System for Power Automation
Ch1 Input, V
Reference
Input, V
R
¨
r1
¨
rn
(n = 1 to 7)
R
AIN_0P
0P
C
0
R
AIN_0GND
0M
R
AIN_7P
7P
C
7
AIN_7GND
R
7M
Typical 50-Hz
Balanced RC Filter
Sine-Wave from CT/PT
on Each Input
Figure 124. 8-Channel, Multiplexed Data Acquisition System for Power Automation
9.2.1.1 Design Requirements
In modern power grids, accurately measuring the electrical parameters of the various areas of the power grid is
extremely critical. This measurement helps determine the operating status and running quality of the grid. Such
accurate measurements also help diagnose potential problems with the power network so that these problems
can be resolved quickly without having any significant service disruption. The key electrical parameters include
amplitude, frequency, and phase, which are important for calculating the power factor, power quality, and other
parameters of the power system.
Copyright © 2015, Texas Instruments Incorporated
1
Ch n Input, V
n
¨= Measured Phase Difference
(n = 1 to 7)
Between Channels
Angle ()
AVDD = 5 V
1 M:
PGA
LPF
1 M:
1 M:
PGA
LPF
1 M:
AGND
Product Folder Links:
NOTE
ADS8668
Simple Capture Card
12-Bit
ADC
FPGA
SITARA
DDR
4.096 V
ADS8664 ADS8668
ADS8664, ADS8668
SBAS492 – JULY 2015
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