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 particularly suited for automotive and industrial environments where high voltage isolation is crucial. The AMC1200-Q1 features a second-order delta-sigma (ΔΣ) modulator, which converts the analog input signal to the digital domain, and a capacitive isolation barrier that ensures high reliability and common-mode transient immunity. The device supports accurate current control and is optimized for direct connection to shunt resistors or other low-voltage level signal sources, making it ideal for current sensing and voltage measurement in noisy environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| High-Side Supply Voltage | 4.5 to 5.5 | V |
| Low-Side Supply Voltage | 2.7 to 5.5 | V |
| Input Offset Error | 1.5 | mV (max) |
| Noise | 3.1 | mV RMS (typical) |
| High-Side Supply Current | 8 | mA (max) at 5 V |
| Input Bandwidth | 60 | kHz (min) |
| Fixed Gain | 8 (0.5% accuracy) | |
| Common-Mode Rejection Ratio | 108 | dB (typical) |
| Isolation Voltage | 4250 | VPEAK |
| Working Voltage | 1200 | VPEAK |
| Transient Immunity | 10 kV/µs (min) | |
| Package Types | SOP (8-pin), SOIC (8-pin) |
Key Features
- Galvanic isolation with a silicon dioxide (SiO2) barrier, certified to UL1577 and VDE V 0884-10 standards.
- Low offset error and noise, ensuring high accuracy in current sensing and voltage measurement.
- High common-mode rejection ratio (CMRR) of 108 dB, providing robust performance in noisy environments.
- Fixed gain of 8 with 0.5% accuracy.
- Self-adjusting common-mode voltage output to match the low-side supply voltage.
- High input common-mode transient immunity and magnetic field immunity.
- Available in wide-body SOP and SOIC packages.
Applications
- Isolated shunt-resistor-based current or voltage sensing in traction inverters, on-board chargers, DC-DC converters, and battery management systems.
- Current sensing in high-noise environments such as the power stage of traction inverters.
- Isolated voltage measurement of the dc-link in automotive and industrial systems.
Q & A
- What is the primary function of the AMC1200-Q1? The AMC1200-Q1 is a fully-differential precision isolation amplifier designed for accurate current sensing and voltage measurement in high-voltage isolation applications.
- What are the typical supply voltages for the AMC1200-Q1? The high-side supply voltage is 4.5 to 5.5 V, and the low-side supply voltage is 2.7 to 5.5 V.
- What is the maximum input offset error of the AMC1200-Q1? The maximum input offset error is 1.5 mV.
- What is the common-mode rejection ratio (CMRR) of the AMC1200-Q1? The CMRR is 108 dB (typical).
- What is the isolation voltage rating of the AMC1200-Q1? The isolation voltage rating is 4250 VPEAK.
- In what types of packages is the AMC1200-Q1 available? The AMC1200-Q1 is available in 8-pin SOP and SOIC packages.
- What are some common applications of the AMC1200-Q1? Common applications include isolated shunt-resistor-based current or voltage sensing in traction inverters, on-board chargers, DC-DC converters, and battery management systems.
- How does the AMC1200-Q1 handle high common-mode transient immunity? The device features high input common-mode transient immunity and magnetic field immunity due to its digital modulation and capacitive isolation barrier.
- What is the fixed gain of the AMC1200-Q1? The fixed gain is 8 with 0.5% accuracy.
- How does the AMC1200-Q1 adjust its output common-mode voltage? The output common-mode voltage is self-adjusting to match the low-side supply voltage.
