Features for the AMC1311
Overview
The AMC1311 series of isolated amplifiers from Texas Instruments are designed for high-voltage measurement applications.
This document compares two variants: AMC1311 and AMC1311B, focusing on their key performance parameters.
Parameter | AMC1311 | AMC1311B | Notes |
Input Range | ±2 V (High Impedance) | ±2 V (High Impedance) | Identical |
Gain Setting | Fixed at 1x | Fixed at 1x | Identical |
Offset Error | ±9.9 mV | ±1.5 mV | AMC1311B shows 84.8% improvement |
Gain Error | ±1% | ±0.2% | AMC1311B shows 80% improvement |
Offset Drift | Typical ±20 μV/°C | Typical ±20 μV/°C | Identical |
Gain Drift | Maximum ±40 ppm/°C | Maximum ±40 ppm/°C | Identical |
Nonlinearity | Maximum 0.04% | Maximum 0.04% | Identical |
CMTI (Common-Mode Transient Immunity) | N/A | 100 kV/μs | AMC1311B offers significantly higher immunity |
Isolation Voltage | 7000 VPK | 7000 VPK | Identical |
Operating Temperature | -40°C to +125°C | -40°C to +125°C | Identical |
High-Side Power Supply Detection | Not Supported | Supported | New feature in AMC1311B |
Description for the AMC1311
The AMC1311 is a precision, isolated amplifier with an output separated from the input circuitry by a capacitive isolation barrier that is highly resistant to magnetic interference.
This barrier is certified to provide reinforced galvanic isolation of up to 5 kVRMS according to DIN EN IEC 60747-17 (VDE 0884-17) and UL1577 and supports a working voltage of up to 1500 VRMS.
The isolation barrier separates parts of the system that operate on different common-mode voltage levels and protects the low-voltage side from voltages that can cause electrical damage or be harmful to an operator.
The high-impedance input of the AMC1311 is optimized for connection to high-impedance resistive dividers or any other high-impedance voltage signal source. The excellent DC accuracy and low temperature drift support accurate, isolated voltage sensing and control in closed-loop systems. The integrated missing high-side supply voltage detection feature simplifies system-level design and diagnostics.
The AMC1311 is offered with two performance grade options: the AMC1311B is specified over the extended industrial temperature range of –55°C to +125°C, and the AMC1311 is specified for operation at –40°C to +125°C.