Voltage

Reference

DOUT

CLKIN

GND

VDD

Manchester

Coding

û -Modulator

AINP

REFOUT

MCE

AINN

8

AMC1035

SBAS837 – AUGUST 2018

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7 Detailed Description

7.1 Overview

The differential analog input (comprised of input signals AINP and AINN) of the AMC1035 is a chopper-stabilized

buffer, followed by 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 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 9 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 AMC1035. The 1-GΩ input

resistance of the analog input stage supports low gain-error signal sensing in high-voltage applications using

resistive dividers. The external clock input simplifies the synchronization of multiple measurement 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.

7.2 Functional Block Diagram