Overview
The AMC1311BDWV, produced by Texas Instruments, is a precision, isolated amplifier designed to provide high accuracy and reliability in voltage sensing applications. This device features a capacitive isolation barrier that is highly resistant to magnetic interference, ensuring robust performance in environments with varying common-mode voltage levels. The AMC1311BDWV is part of the AMC1311 family, which includes two performance grade options: the AMC1311 and the AMC1311B, with the latter offering enhanced specifications over an extended industrial temperature range of –55°C to +125°C.
Key Specifications
| Parameter | AMC1311 | AMC1311B |
|---|---|---|
| Input Voltage Range | –0.1 V to 2 V | –0.1 V to 2 V |
| Offset Error | ±9.9 mV (maximum) | ±1.5 mV (maximum) |
| Offset Drift | ±20 µV/°C (typical) | ±10 µV/°C (maximum) |
| Gain Error | ±1% (maximum) | ±0.2% (maximum) |
| Gain Drift | ±30 ppm/°C (typical) | ±40 ppm/°C (maximum) |
| Nonlinearity | 0.04% (maximum) | 0.04% (maximum) |
| Common-Mode Transient Immunity (CMTI) | 15 kV/µs (minimum) | 100 kV/µs (minimum) |
| Operating Temperature Range | –40°C to +125°C | –55°C to +125°C |
| Power Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Package | 8-Pin SOIC | 8-Pin SOIC |
Key Features
- High-Impedance Input: Optimized for connection to high-impedance resistive dividers or other high-impedance voltage signal sources.
- Fixed Gain: Gain of 1 for straightforward voltage measurement.
- Low DC Errors: Low offset error and drift, and low gain error and drift, ensuring high accuracy.
- Reinforced Isolation: Certified to provide up to 5 kV RMS reinforced galvanic isolation according to DIN EN IEC 60747-17 (VDE 0884-17) and UL1577.
- Missing High-Side Supply Indication: Integrated feature for detecting missing high-side supply voltage, simplifying system design and diagnostics.
- High CMTI: High common-mode transient immunity, especially in the AMC1311B version.
- 3.3-V Operation: The AMC1311B supports 3.3-V operation on the high side.
Applications
- Isolated Voltage Sensing: In motor drives, frequency inverters, and uninterruptible power supplies.
- Closed-Loop Systems: Accurate voltage sensing and control in systems requiring isolated measurements.
- Safety-Critical Systems: Where reinforced galvanic isolation is necessary to protect the low-voltage side from high-voltage electrical damage.
Q & A
- What is the primary function of the AMC1311BDWV?
The AMC1311BDWV is a precision, isolated amplifier designed for accurate voltage measurement in isolated environments.
- What is the input voltage range of the AMC1311BDWV?
The input voltage range is –0.1 V to 2 V.
- What are the key differences between the AMC1311 and AMC1311B?
The AMC1311B has lower offset error and drift, lower gain error and drift, and operates over an extended industrial temperature range of –55°C to +125°C.
- What is the common-mode transient immunity (CMTI) of the AMC1311B?
The CMTI of the AMC1311B is 100 kV/µs (minimum).
- What safety certifications does the AMC1311BDWV hold?
The device is certified for reinforced galvanic isolation according to DIN EN IEC 60747-17 (VDE 0884-17) and UL1577.
- What is the package type of the AMC1311BDWV?
The device is packaged in an 8-Pin SOIC.
- What is the operating temperature range of the AMC1311B?
The operating temperature range is –55°C to +125°C.
- How does the AMC1311BDWV protect against high-voltage electrical damage?
The device features a capacitive isolation barrier that separates the input and output circuitry, providing reinforced galvanic isolation.
- What is the significance of the missing high-side supply indication feature?
This feature simplifies system-level design and diagnostics by detecting when the high-side supply voltage is missing.
- In which applications is the AMC1311BDWV commonly used?
It is commonly used in motor drives, frequency inverters, and uninterruptible power supplies for isolated voltage sensing.
