Texas Instruments AMC1204EVM, User Manual, Page: 2 / 9

2
1
J4
R2
R1
C4
10pF C5
10pF
IN+
IN
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12
C3
330pF
ISOGND
AMC1204EVM Overview
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1 AMC1204EVM Overview
1.1 Features
AMC1204EVM:
• Full-featured evaluation module for the AMC1204 single-channel, ΔΣ modulator
• 9-pin sub-D connector for interfacing to the AMC1210 digital filter evaluation module
• Screw terminals for easy access to analog inputs
1.2 Introduction
The AMC1204 is a 1-bit modulator with an output buffer separated from the input interface circuitry by a
silicon dioxide (SiO
2
) isolation barrier. The isolation barrier provides galvanic isolation of up to 4000 V
PEAK
.
When used in combination with the AMC1210 or other digital filter, the AMC1204 can be used to achieve
16-bit analog-to-digital (A/D) conversion with no missing codes.
For use in high-resolution measurement applications, an effective accuracy of 14 bits can be obtained with
a digital filter bandwidth of 20 kHz at a modulator rate of 10 MHz.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the AMC1204EVM.
2 Analog Interface
The analog input to the AMC1204 is routed from a two-wire screw terminal screw at J4. This screw
terminal gives the user access to the inverting and noninverting inputs of the AMC1204.
2.1 Analog Inputs
The analog input to the AMC1204EVM board consists of simple R/C filter circuits. The input circuit for the
AMC1204 is shown in
Figure 1 .
Figure 1. AMC1204EVM Schematic: Analog Input Section
2 AMC1204EVM SBAU178 – August 2010
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