AMC1100_15 Datasheet, PDF (12/33 Pages) Texas Instruments – AMC1100 Fully-Differential Isolation Amplifier

AMC1100
SBAS562A – APRIL 2012 – REVISED DECEMBER 2014
7 Detailed Description
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7.1 Overview
The AMC1100 consists of a delta-sigma modulator input stage including an internal reference and clock
generator. The output of the modulator and clock signal are differentially transmitted over the integrated
capacitive isolation barrier that separates the high- and low-voltage domains. The received bitstream and clock
signals are synchronized and processed by a third-order analog filter with a nominal gain of 8 on the low-side
and presented as a differential output of the device, as 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 SLLA181, ISO72x Digital Isolator Magnetic-Field Immunity (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
3^rd order
active
low-pass filter
VOUTP
VOUTN
GND1
GND2
12
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