AMC1306E05_17 Datasheet, PDF (17/40 Pages) Texas Instruments – Small, High-Precision, Reinforced Isolated Delta-Sigma Modulators with High CMTI

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8 Detailed Description
AMC1306E05, AMC1306E25, AMC1306M05, AMC1306M25
SBAS734 – MARCH 2017
8.1 Overview
The differential analog input (comprised of input signals AINP and AINN) of the AMC1306 is a fully-differential
amplifier feeding the switched-capacitor input of a second-order, delta-sigma (ΔΣ) modulator stage that digitizes
the input signal into a 1-bit output stream. The isolated data output DOUT of the converter provides a stream of
digital ones and zeros that is synchronous to the externally-provided clock source at the CLKIN pin with a
frequency in the range of 5 MHz to 21 MHz. The time average of this serial bitstream output is proportional to the
analog input voltage.
The Functional Block Diagram section shows a detailed block diagram of the AMC1306. The analog input range
is tailored to directly accommodate a voltage drop across a shunt resistor used for current sensing. The silicon-
dioxide (SiO₂) based capacitive isolation barrier supports a high level of magnetic field immunity as described in
the ISO72x Digital Isolator Magnetic-Field Immunity application report, available for download at www.ti.com. The
external clock input simplifies the synchronization of multiple current-sensing channels on the system level. The
extended frequency range of up to 21 MHz supports higher performance levels compared to the other solutions
available on the market.
8.2 Functional Block Diagram
AINP
AMC1306x
AVDD
Reinforced
Isolation
Barrier
DVDD
û Modulator
DOUT
AINN
Band-Gap
Reference
VCM, AVDD
Diagnostic
CLKIN
AGND
DGND
Copyright © 2017, Texas Instruments Incorporated
Copyright © 2017, Texas Instruments Incorporated
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Product Folder Links: AMC1306E05 AMC1306E25 AMC1306M05 AMC1306M25