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AN614 Datasheet(PDF) 4 Page - Silicon Laboratories

Part No. AN614
Description  A SIMPLE ALTERNATIVE TO ANALOG ISOLATION AMPLIFIERS
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Maker  SILABS [Silicon Laboratories]
Homepage  http://www.silabs.com
Logo SILABS - Silicon Laboratories

AN614 Datasheet(HTML) 4 Page - Silicon Laboratories

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AN614
4
Rev. 0.2
Figure 5 shows total harmonic distortion and nonlinearity measurements from the evaluation board of Figure 4.
Waveform A shows the ISOlinear input and output oscilloscope waveforms. The FFT of waveform A reveals a total
harmonic distortion (THD) of 0.096% (waveform B). The performance of this design rounds to 12-bit performance
with 0.125% nonlinearity. (Note: for more information about the ISOlinear Reference Design, please see
application note “AN559: Isolating Analog Signals Using the Si86xx CMOS Isolator Family”. This application note
provides detailed technical information for modifying the stock ISOlinear reference design, including modulator and
filter design equations, design guidelines and more. The ISOlinear Reference Design Kit (Si86IsoLin)is available
for purchase at www.silabs.com/isolation.)
Figure 5. ISOlinear Reference Design Performance Example
Table 1 compares the ISOlinear reference design performance against several commercially-available ISOamps.
The ISOlinear reference designs offer higher signal-to-noise (sans the 9-bit version); higher CMTI, greater isolation
rating flexibility and lower cost compared to competing ISOamps. (Note: a higher cost, faster comparator can be
used to reduce nonlinearity to less than 0.1%.)
Input
Output
AB
C
FFT
2.25
2.35
2.45
2.55
2.65
2.75
2.85
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
Vin (V)
Linearity
0.125% Nonlinearity
0.096% THD


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