Overview
The AMC1351DWVR from Texas Instruments is a precision, isolated amplifier designed for high-accuracy voltage sensing in industrial applications. This device features a linear input voltage range of –0.25 V to 5 V and is optimized for connection to high-impedance resistive dividers or other voltage signal sources. The AMC1351 provides reinforced galvanic isolation, protecting the low-voltage side from potentially harmful voltages and ensuring reliable operation over an extended industrial temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Linear Input Voltage Range | –0.25 V to 5 V | V |
| High Input Impedance | 1.25 MΩ (typ) | Ω |
| Fixed Gain | 0.4 V/V | V/V |
| Offset Error | ±1.5 mV (max) | mV |
| Offset Drift | ±15 µV/°C (max) | µV/°C |
| Gain Error | ±0.2% (max) | % |
| Gain Drift | ±35 ppm/°C (max) | ppm/°C |
| Nonlinearity | ±0.02% (max) | % |
| Common-Mode Transient Immunity (CMTI) | 100 kV/µs (min) | kV/µs |
| Isolation Voltage | Up to 5 kV RMS | kV RMS |
| Operating Temperature Range | –40°C to +125°C | °C |
Key Features
- High input impedance of 1.25 MΩ (typ) for connection to high-impedance resistive dividers or other voltage signal sources.
- Low DC errors, including offset error of ±1.5 mV (max), offset drift of ±15 µV/°C (max), gain error of ±0.2% (max), and gain drift of ±35 ppm/°C (max).
- High common-mode transient immunity (CMTI) of 100 kV/µs (min) for reliable operation in noisy environments.
- Reinforced galvanic isolation up to 5 kV RMS, certified according to VDE V 0884-11 and UL1577.
- Fail-safe output feature for simplified system diagnostics.
- Operation on both high-side and low-side with supply voltages of 3.3 V or 5 V.
- Extended industrial temperature range of –40°C to +125°C.
Applications
The AMC1351 is widely used in various industrial applications requiring accurate and isolated voltage sensing. These include:
- DC/DC converters: For monitoring output voltages in isolated power supplies.
- Frequency inverters: For sensing DC bus voltages in motor drive systems.
- Motor drives: For accurate voltage monitoring in high-voltage motor drive applications.
- Other high-voltage applications: Where isolation from the low-voltage side is crucial for safety and reliability.
Q & A
- What is the input voltage range of the AMC1351?
The AMC1351 has a linear input voltage range of –0.25 V to 5 V. - What is the typical input impedance of the AMC1351?
The typical input impedance is 1.25 MΩ. - What is the fixed gain of the AMC1351?
The fixed gain is 0.4 V/V. - What are the key DC error specifications of the AMC1351?
The key DC error specifications include an offset error of ±1.5 mV (max), offset drift of ±15 µV/°C (max), gain error of ±0.2% (max), and gain drift of ±35 ppm/°C (max). - What is the common-mode transient immunity (CMTI) of the AMC1351?
The CMTI is 100 kV/µs (min). - What is the isolation voltage rating of the AMC1351?
The AMC1351 is rated for up to 5 kV RMS isolation. - What is the operating temperature range of the AMC1351?
The operating temperature range is –40°C to +125°C. - Does the AMC1351 have a fail-safe output feature?
Yes, the AMC1351 includes a fail-safe output feature for system diagnostics. - What are typical applications of the AMC1351?
Typical applications include DC/DC converters, frequency inverters, motor drives, and other high-voltage applications requiring isolated voltage sensing. - How is the power supply for the AMC1351 typically configured?
The high-side power supply (VDD1) can be generated from a gate-driver supply or an isolated DC/DC converter, and both high-side and low-side supplies are decoupled with low-ESR capacitors.
