AMC1303E0510 Datasheet, PDF (17/40 Pages) Texas Instruments – Small, High-Precision, Reinforced Isolated Delta-Sigma Modulators with Internal Clock

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8 Detailed Description
AMC1303E0510, AMC1303M0510, AMC1303E0520, AMC1303M0520
AMC1303E2510, AMC1303M2510, AMC1303E2520, AMC1303M2520
SBAS771 – JUNE 2017
8.1 Overview
The analog input stage of the AMC1303 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 internally-generated clock at the CLKOUT pin (active on AMC1303Mx derivates only) with a frequency as
specified in the Switching Characteristics table. The time average of this serial bit-stream output is proportional to
the analog input voltage.
The Functional Block Diagram section shows a detailed block diagram of the AMC1303. The analog input range
is tailored to directly accommodate a voltage drop across a shunt resistor used for current sensing. The SiO₂-
based capacitive isolation barrier supports a high level of magnetic field immunity as described in the application
report ISO72x Digital Isolator Magnetic-Field Immunity (SLLA181A), available for download at www.ti.com. The
extended clock frequency of 20 MHz on the AMC1303xxx20 supports faster control loops and higher
performance levels compared to the other solutions available on the market.
8.2 Functional Block Diagram
AINP
AINN
AVDD
û -Modulator
Isolation
Barrier
DVDD
DOUT
AMC1303x
Bandgap
Reference
VCM / AVDD
Diagnostic
AGND
CLKOUT
(AMC1303Mx only)
DGND
Copyright © 2017, Texas Instruments Incorporated
Copyright © 2017, Texas Instruments Incorporated
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Product Folder Links: AMC1303E0510 AMC1303M0510 AMC1303E0520 AMC1303M0520 AMC1303E2510
AMC1303M2510 AMC1303E2520 AMC1303M2520