AMC1200-Q1_16 Datasheet, PDF (11/30 Pages) Texas Instruments – Fully-Differential Isolation Amplifier

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7 Detailed Description
AMC1200-Q1
SBAS585A – SEPTEMBER 2012 – REVISED JANUARY 2016
7.1 Overview
The AMC1200-Q1 is a fully-differential precision isolation amplifier. The input stage of the device consists of a
second-order, delta-sigma (ΔΣ) modulator, voltage reference, clock generator, and drivers for the capacitive
isolation barrier. The modulator converts the analog input signal to the digital domain. The drivers transfer the
output of the modulator and the clock signal across the 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, ISO72x Digital Isolator Magnetic-Field Immunity (SLLA181). The digital modulation used in the
AMC1200-Q1 and the isolation barrier characteristics result in high reliability and common-mode transient
immunity.
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
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