Texas Instruments AMC1305 EVM Series, Руководство пользователя, Страница: 2 / 16

Overview
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1 Overview
1.1 Features
• Full-featured evaluation module for the AMC1305 single-channel, isolated, delta-sigma ( ΔΣ ) modulator
• Screw terminals for easy access to analog inputs, clock input, and modulator data output
• Optional isolated power to the AMC1305 analog voltage supply input derived from the controller-side
power supply
1.2 Introduction
The AMC1305 is a single-channel, second-order, switched-capacitor, ΔΣ modulator with an output
separated from the input interface circuitry by a capacitive isolation barrier. The isolation barrier provides
galvanic isolation of up to 7000 V
PEAK
. The AMC1305 can be used to achieve 16 bits of resolution with a
dynamic range of 80 dB (13 ENOB) at a data rate of 78 kSPS when paired with a digital filter (such as the
ΔΣ filter module in the TMS320F28377D or the AMC1210 ).
2 Analog Interface
The analog input to the AMC1305 is routed from the two-wire screw terminal at J2. This screw terminal
gives the user access to the inverting and noninverting inputs of the AMC1305 device installed at U1.
2.1 Analog Inputs
The analog input to the AMC1305EVM printed circuit board (PCB) consists of a simple RC filter circuit.
The input circuitry to the AMC1305 is shown in
Figure 1 .
Figure 1. AMC1305EVM Schematic: Analog Input Section
Note that the RC filter circuit is not required in every application; the input amplifier of the AMC1305
already provides a limited input bandwidth. See
Table 1 for additional details about the analog input
bandwidth for each component in the AMC1305 family.
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2 AMC1305xxEVM User's Guide SBAU237 – September 2014
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