AMC1411EVM

AMC1411 电压检测用 2V 输入增强型隔离式放大器评估模块

The AMC1400 and AMC1411 are precision isolation amplifiers with an output separated from the input circuitry by a silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference. This barrier has been certified to provide reinforced galvanic isolation of up to 10.5 kVPEAK per DIN V VDE V 0884-11 (VDE V 0884-11): 2017-01.

1 Introduction

For use in high-resolution, current-measurement applications, the AMC1400 is optimized for connection to 

low-ohmic-value shunt resistors or other voltage signal sources with low-output resistance.

For use in high-resolution, voltage-measurement applications, the high-impedance input of the AMC1411 is 

optimized for connection to high-voltage resistive dividers or other voltage signal sources with high-output 

resistance.

Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the 

AMC1400EVM or AMC1411EVM.

1.1 Features

This EVM has the following features:

• Full-featured evaluation module for the AMC1400 or AMC1411 single-channel precision isolation amplifier

• Screw terminals for easy access to high- and low-side power supplies, analog inputs, and analog outputs

2 Analog Interface

The analog input to the EVM is routed from a three-wire screw terminal screw at J3.1, which provides access to 

the INP terminal, referenced to J3.3, GND1. J3.2 provides access to either the INN terminal for the AMC1400 or 

the SHTDN terminal for the AMC1411. By default, J3.2 is shorted to GND1 by a 0-Ω resistor, R5.

2.1 Analog Input

The analog input of the EVM is accessible to the user by connector J3. The passive components of the analog 

input section are comprised of R1, R3, and C8 that form a simple differential antialiasing filter with a corner 

frequency of 796 kHz. The input of the AMC1411 is single-ended; therefore, R3 is not installed. R1 and C8 on 

the AMC1411EVM form a simple antialiasing filter with a corner frequency of 1.6 MHz. An antialiasing cutoff 

frequency between 200 kHz and 2 MHz is recommended. By default, INN (pin 3) of the AMC1400 and SHTDN 

(pin 3) of the AMC1411 is tied to GND1 (pin 4) by a 0 Ω resistor (R5). Figure 2-1 shows the input circuit for the 

AMC1400EVM.

Using a signal generator or other voltage source, the user can apply an input signal directly to J3.1. The linear 

input voltage range of the AMC1400 by J3.1 is –250 mVDC to 250 mVDC, whereas the linear input voltage 

range of the AMC1411 is 0 VDC to 2 VDC referenced to J3.3, GND1. If measuring across an external shunt 

resistor, tie J3.1 to the positive Kelvin connection terminal and tie J3.3 to the negative Kelvin connection terminal 

of the shunt resistor

2.2 Shutdown

The AMC1411 features a shutdown option which is an active high input. Resistor R5 is installed by default and 

allows for normal operation of the AMC1411. When the resistor is removed, the SHTDN pin can be controlled 

externally via J3.2 to shutdown the AMC1411. When shutdown, the AMC1411 enters into a low-power mode by 

means of an internal pullup resistor for battery-powered or other power-sensitive applications.

2.3 Analog Output

The analog output from the EVM is a fully-differential signal centered at 1.44 V. Figure 2-2 shows that the 

differential output of U1 is available on the two screw terminals of J4. OUTP is available at J4.3 and swings from 

0.5 V to 2.5 V when a –250-mV to 250-mV signal is applied to the input of the AMC1400 or from 1.44 V to 2.5 

V when a 0-V to 2-V signal is applied to the input of the AMC1411. OUTN is available at J4.2 and swings from 

2.5 V to 0.5 V when a –250-mV to 250-mV signal is applied to the input of the AMC1400 or from 1.44 V to 0.5 

V when a 0-V to 2-V signal is applied to the input of the AMC1411. The pads of R2, R4, C9, C7, and C12 allow 

users to install their own output filtering. Table 2-1 lists a few example filters. Common-mode filter capacitors C7 

and C12 are recommended to be at least 20 times less than the differential filter capacitor.

3 Power Supplies

The EVM requires two separate power rails, VDD1 and VDD2. VDD1 is on the high-voltage side of the amplifier. 

VDD2 is on the user side of the amplifier.

3.1 VDD1 Input

The EVM provides access to VDD1 by J1.1. The VDD1 supply must be between 3 VDC and 5.5 VDC with 

respect to GND1, where J1.2 and J3.3 provide direct access to GND1.

3.2 VDD2 Input

The EVM provides access to VDD2 by J2.2. The VDD2 supply must be between 3 VDC and 5.5 VDC with 

respect to GND2, where J2.1 and J4.1 provide direct access to GND2