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| AMC1200_15 Datasheet, PDF (11/31 Pages) Texas Instruments – AMC1200/B Fully-Differential Isolation Amplifier | |||
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www.ti.com
7 Detailed Description
AMC1200, AMC1200B
SBAS542D â APRIL 2011 â REVISED JULY 2015
7.1 Overview
The AMC1200 is a fully-differential precision isolation amplifier. The analog input signal is converted to a digital
signal and then transferred across a capacitive isolation barrier. The digital modulation used in the AMC1200
together with the isolation barrier characteristics result in excellent reliability and transient immunity.
After processing the digital signal with a low-pass filter, an analog signal is provided at the outputs. The main
building blocks are shown in the Functional Block Diagram section.
The SiO2-based capacitive isolation barrier supports a high level of magnetic field immunity, as described in
application report, ISO72x Digital Isolator Magnetic-Field Immunity (SLLA181), available for download at
www.ti.com.
7.2 Functional Block Diagram
VINP
VINN
VDD1
2.5-V
Reference
Isolation
Barrier
DATA
TX
RX
û-Modulator
TX
RX
CLK
RC oscillator
VDD2
2.56-V
Reference
Retiming and
3rd order
active
low-pass filter
VOUTP
VOUTN
GND1
GND2
7.3 Feature Description
7.3.1 Insulation Characteristics
VIORM
VPR
VIOTM
VISO
RS
PARAMETER
TEST CONDITIONS
Maximum working
insulation voltage
Qualification test: after Input/Output Safety Test
Subgroup 2/3 VPR = VIORM Ã 1.2, t = 10 s, partial
discharge < 5 pC
Input to output test voltage
Qualification test: method a, after environmental tests
subgroup 1, VPR = VIORM Ã 1.6, t = 10 s, partial
discharge < 5 pC
100% production test: method b1, VPR = VIORM x 1.875,
t = 1 s, partial discharge < 5 pC
Transient overvoltage
Qualification test: t = 60 s
AMC1200
AMC1200B
Insulation voltage per UL
Qualification test: VTEST = VISO,
t = 60 s
100% production test: VTEST =
1.2 x VISO, t = 1 s
AMC1200
AMC1200B
AMC1200
AMC1200B
Insulation resistance
VIO = 500 V at TS
Copyright © 2011â2015, Texas Instruments Incorporated
Product Folder Links: AMC1200 AMC1200B
MIN
TYP
MAX UNIT
1200 VPEAK
1140 VPEAK
1920 VPEAK
> 109
2250
4000
4250
4000
4250
4800
5100
VPEAK
VPEAK
VPEAK
VPEAK
VPEAK
VPEAK
VPEAK
Ω
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