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Si8920 Datasheet
ISOLATED AMPLIFIER

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Si8920
ISOLATED AMPLIFIER FOR CURRENT SHUNT MEASUREMENT
Features
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 µV/°C offset drift
60 ppm/°C gain drift
Nonlinearity: 0.1% full-scale
Low noise: 0.10 mVrms over
100 kHz bandwidth
High common-mode transient
immunity: 75 kV/µs
Compact packages
16-pin wide body SOIC
8-pin surface mount DIP
–40 to 125 °C
AEC-Q100
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
Safety Approvals (Pending)
UL 1577 recognized
Up to 5000 Vrms for 1 minute
CSA component notice 5A
approval
VDE certification conformity
VDE0884 Part 10
(basic/reinforced insulation)
CQC certification approval
GB4943.1
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.
Ordering Information:
See page 14.
Pin Assignments
VDDA 1
AIP 2
AIN 3
GNDA 4
Si8920
8 VDDB
7 AOP
6 AON
5 GNDB
VDDA 1
AIP 2
AIN 3
GNDA 4
NC 5
NC 6
NC 7
GNDA 8
16 GNDB
15 NC
14 VDDB
13 AOP
Si8920
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.

Si8920 Datasheet
ISOLATED AMPLIFIER

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Si8920 pdf
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Si8920
2 Preliminary Rev. 0.5

Si8920 Datasheet
ISOLATED AMPLIFIER

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Si8920 pdf
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TABLE OF CONTENTS
Si8920
Section
Page
1. Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.1. Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3. Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. Current Sense Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8. Package Outline: DIP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9. Land Pattern: DIP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10. Package Outline: 16-Pin Wide Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
11. Land Pattern: 16-Pin Wide Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12. Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12.1. Si8920 Top Marking (DIP8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12.2. Top Marking Explanation (DIP8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12.3. Si8920 Top Marking (SOIC-16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
12.4. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Preliminary Rev. 0.5
3


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