Overview
The AMC1200-Q1, produced by Texas Instruments, is a fully-differential precision isolation amplifier designed for high-performance applications requiring galvanic isolation. This device is optimized for isolated shunt-resistor-based current or voltage sensing and is particularly suited for automotive and industrial environments where high voltage isolation is crucial. The AMC1200-Q1 features a second-order delta-sigma (ΔΣ) modulator, a voltage reference, a clock generator, and drivers for the capacitive isolation barrier, ensuring high reliability and common-mode transient immunity.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Input Offset Voltage | -1.5 | 0.2 | 1.5 | mV |
| Input Offset Thermal Drift | -10 | 1.5 | 10 | µV/°C |
| Common-Mode Rejection Ratio (CMRR) | 108 | - | - | dB |
| High-Side Supply Current | - | - | 8 | mA |
| Input Bandwidth | 60 | - | - | kHz |
| Fixed Gain | - | 8 (0.5% accuracy) | - | - |
| Isolation Voltage | - | - | 4250 | VPEAK |
| Working Voltage | - | - | 1200 | VPEAK |
| Transient Immunity | 10 | - | - | kV/µs |
Key Features
- Galvanic Isolation: Certified to UL1577 and VDE V 0884-10 with an isolation voltage of up to 4250 VPEAK and a working voltage of 1200 VPEAK.
- Low Offset Error and Noise: Maximum input offset voltage of 1.5 mV and typical noise of 3.1 mVRMS.
- High Common-Mode Rejection Ratio: Typical CMRR of 108 dB.
- Fixed Gain: Nominal gain of 8 with 0.5% accuracy.
- Input Bandwidth: Minimum input bandwidth of 60 kHz.
- Low Power Consumption: High-side supply current of up to 8 mA at 5 V.
- High Reliability: Typical 10-year lifespan at rated working voltage.
- Magnetic Field Immunity: High level of magnetic field immunity due to the SiO2-based capacitive isolation barrier.
Applications
- Traction Inverters: For current sensing in high-noise environments such as the power stage of traction inverters.
- On-Board Chargers: Isolated voltage and current measurements.
- DC-DC Converters: Isolated sensing of output currents or voltages.
- Battery Management Systems: Accurate current and voltage measurements in high-voltage battery systems.
Q & A
- What is the primary function of the AMC1200-Q1?
The AMC1200-Q1 is a fully-differential precision isolation amplifier designed for isolated shunt-resistor-based current or voltage sensing.
- What are the key certifications for the AMC1200-Q1's isolation capabilities?
The device is certified to UL1577 and VDE V 0884-10 standards.
- What is the maximum input offset voltage of the AMC1200-Q1?
The maximum input offset voltage is 1.5 mV.
- What is the typical common-mode rejection ratio (CMRR) of the AMC1200-Q1?
The typical CMRR is 108 dB.
- What is the fixed gain of the AMC1200-Q1?
The nominal gain is 8 with 0.5% accuracy.
- What is the minimum input bandwidth of the AMC1200-Q1?
The minimum input bandwidth is 60 kHz.
- What is the maximum high-side supply current of the AMC1200-Q1 at 5 V?
The maximum high-side supply current is 8 mA.
- What is the typical lifespan of the AMC1200-Q1 at rated working voltage?
The typical lifespan is 10 years.
- In what types of applications is the AMC1200-Q1 commonly used?
The AMC1200-Q1 is commonly used in traction inverters, on-board chargers, DC-DC converters, and battery management systems.
- How does the AMC1200-Q1 ensure magnetic field immunity?
The device uses a SiO2-based capacitive isolation barrier that provides high magnetic field immunity.
