Texas Instruments AMC1302/AMC1302-Q1 Precision Isolated Amplifiers
Texas Instruments AMC1302/AMC1302-Q1 Precision Isolated Amplifiers are precision isolated amplifiers with a capacitive isolation barrier with high immunity to magnetic interference. This barrier provides reinforced isolation of 5kVRMS (maximum) with a very long lifetime and low power dissipation. This device isolates components that operate on different common-mode voltage levels when used with isolated power supplies. The AMC1302/AMC1302-Q1 also protects lower-voltage devices from damage.
The input of the AMC1302/AMC1302-Q1 is optimized for direct connection to shunt resistors or other low voltage-level signal sources. The ±50mV input voltage range allows a significant reduction of the power dissipation through the shunt. The low high-side supply current and voltage of the AMC1302/AMC1302-Q1 also allows for the use of low-cost isolated power-supply solutions. The performance of the device supports accurate current control resulting in system-level power savings and in low torque ripple that is particularly important in motor control applications. The integrated input common-mode overvoltage and missing high-side supply voltage detection features of the AMC1302/AMC1302-Q1 simplify system-level diagnostics. The AMC1302-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- ±50mV Input voltage range for low dissipation, shunt-resistor-based current measurement
- Fixed gain with low drift of 41 ±0.3%, ±50ppm/°C
- Low input offset and drift of ±100µV, ±0.8µV/°C
- Low nonlinearity and drift of ±0.03%, ±1ppm/°C
- Very low isolated high-side power dissipation when operated from a 3.3V supply
- System-level diagnostic features
- Safety-related certifications
- 7071VPK Reinforced isolation per DIN V VDE V 0884-11 (VDE V 0884-11): 2017-01
- 5000VRMS Isolation for 1 minute per UL1577
- –55°C to +125°C Extended industrial temperature range
- High CMTI of 140kV/µs (typ), 70kV/µs (min)
Applications
- Shunt-resistor-based current sensing in
- Motor drives
- Avionics
- Power delivery
- Industrial transport
- Appliances
- Grid infrastructure
Datasheets
Functional Block Diagram
