Overview
The AMC1300DWVR from Texas Instruments is a precision, isolated amplifier designed for high-accuracy current measurement and voltage sensing applications. It features a reinforced isolation barrier, providing up to 5 kV RMS isolation according to VDE V 0884-11 and UL1577 standards. This device is optimized for direct connection to shunt resistors or other low-voltage signal sources, making it ideal for motor control, frequency inverters, and uninterruptible power supplies. The AMC1300DWVR is available in two performance grades: the AMC1300B, which operates over an extended industrial temperature range of –55°C to +125°C, and the AMC1300, which operates from –40°C to +125°C.
Key Specifications
| Parameter | AMC1300B | AMC1300 |
|---|---|---|
| High-side supply voltage (VDD1) | 3.0 V to 5.5 V | 4.5 V to 5.5 V |
| Specified ambient temperature (TA) | –55°C to +125°C | –40°C to +125°C |
| Input offset voltage (VOS) | ±0.2 mV (max) | ±2 mV (max) |
| Input offset drift (TCVOS) | ±0.9 µV/°C (max) | ±4 µV/°C (max) |
| Gain error (EG) | ±0.3% (max) | ±1% (max) |
| Gain error drift (TCEG) | ±30 ppm/°C (max) | ±50 ppm/°C (typ) |
| Common-mode transient immunity (CMTI) | 100 kV/µs (min) | 15 kV/µs (min) |
| Output bandwidth (BW) | 250 kHz (min) | 170 kHz (min) |
| Signal delay (50% – 90%) | 3 µs (max) | 3.4 µs (max) |
Key Features
- ±250-mV input voltage range optimized for current measurement using shunt resistors.
- Fixed gain of 8.2.
- Low DC errors: offset error, offset drift, gain error, and gain drift.
- 3.3-V operation on the high side for the AMC1300B.
- High common-mode transient immunity (CMTI): 100 kV/µs (minimum) for the AMC1300B.
- Low EMI, meeting CISPR-11 and CISPR-25 standards.
- System-level diagnostic features including common-mode overvoltage and missing high-side supply voltage detection.
- Safety-related certifications: 7071-VPK reinforced isolation per DIN VDE V 0884-11: 2017-01 and 5000-VRMS isolation for 1 minute per UL1577.
Applications
- Shunt-resistor-based current sensing in motor drives.
- Frequency inverters.
- Uninterruptible power supplies.
Q & A
- What is the input voltage range of the AMC1300? The input voltage range is ±250 mV, optimized for current measurement using shunt resistors.
- What is the fixed gain of the AMC1300? The fixed gain is 8.2.
- What are the key DC error specifications of the AMC1300B? The AMC1300B has an offset error of ±0.2 mV, offset drift of ±0.9 µV/°C, gain error of ±0.3%, and gain drift of ±30 ppm/°C.
- What is the common-mode transient immunity (CMTI) of the AMC1300B? The CMTI is 100 kV/µs (minimum).
- Does the AMC1300 meet any specific EMI standards? Yes, it meets CISPR-11 and CISPR-25 standards for low EMI.
- What safety certifications does the AMC1300 have? It has 7071-VPK reinforced isolation per DIN VDE V 0884-11: 2017-01 and 5000-VRMS isolation for 1 minute per UL1577.
- What are the typical applications of the AMC1300? Typical applications include shunt-resistor-based current sensing in motor drives, frequency inverters, and uninterruptible power supplies.
- What is the operating temperature range for the AMC1300B? The operating temperature range for the AMC1300B is –55°C to +125°C.
- What is the output bandwidth of the AMC1300B? The output bandwidth is 250 kHz (minimum).
- Does the AMC1300 have any system-level diagnostic features? Yes, it includes common-mode overvoltage and missing high-side supply voltage detection features.
