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SI8920

Description
ISOLATED AMPLIFIER FOR CURRENT SHUNT MEASUREMENT
File Size424KB,22 Pages
ManufacturerSILABS
Websitehttp://www.silabs.com
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SI8920 Overview

ISOLATED AMPLIFIER FOR CURRENT SHUNT MEASUREMENT

Si8920
I
S O L A T E D
A
M P L I F IE R
Features
FOR
C
URRENT
S
HUNT
M
EASUREMENT
Low voltage differential input

±100
mV and ±200 mV options
Low signal delay: 0.75 µs
Input offset: 0.2 mV
Gain error: <0.5%
Excellent drift specifications

1
Low noise: 0.10 mVrms over
100 kHz bandwidth
High common-mode transient
immunity: 75 kV/µs
Compact packages
wide body SOIC

8-pin surface mount DIP
–40 to 125 °C
AEC-Q100

16-pin
µV/°C offset drift

60 ppm/°C gain drift
Nonlinearity: 0.1% full-scale
Applications
Industrial, HEV and renewable
energy inverters
AC, Brushless, and DC motor
controls and drives
Variable speed motor control in
consumer white goods
Isolated switch mode and UPS
power supplies
Ordering Information:
See page 14.
Safety Approvals (Pending)
UL 1577 recognized

Up
VDE certification conformity

VDE0884
to 5000 Vrms for 1 minute
CSA component notice 5A
approval
Part 10
(basic/reinforced insulation)
Pin Assignments
VDDA
1
AIP
2
AIN
3
GNDA
4
8
CQC certification approval

GB4943.1
VDDB
Description
The Si8920 is a galvanically isolated analog amplifier. The low-voltage
differential input is ideal for measuring voltage across a current shunt
resistor or for any place where a sensor must be isolated from the control
system. The output is a differential analog signal amplified by either 8.1x
or 16.2x.
The very low signal delay of the Si8920 allows control systems to respond
quickly to fault conditions or changes in load. Low offset and gain drift
ensure that accuracy is maintained over the entire operating temperature
range. Exceptionally high common-mode transient immunity means that
the Si8920 delivers accurate measurements even in the presence of high-
power switching as is found in motor drive systems and inverters.
The Si8920 isolated amplifier utilizes Silicon Labs’ proprietary isolation
technology. It supports up to 5.0 kVrms withstand voltage per UL1577.
This technology enables higher performance, reduced variation with
temperature and age, tighter part-to-part matching, and longer lifetimes
compared to other isolation technologies.
Si8920
7
AOP
6
5
AON
GNDB
VDDA
1
AIP
2
AIN
3
GNDA
4
NC
5
NC
6
NC
7
GNDA
8
16
GNDB
15
NC
14
VDDB
Si8920
13
AOP
12
NC
11
AON
10
NC
9
GNDB
Patents pending
Preliminary Rev. 0.5 8/15
Copyright © 2015 by Silicon Laboratories
Si8920
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
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