Texas Instruments AMC1200/AMC1200B Differential Isolation Amps
Texas Instruments AMC1200/AMC1200B Fully Differential Isolation Amplifiers are precision devices with an output separated from the input circuitry by a silicon dioxide barrier that is highly resistant to magnetic interference. Used in conjunction with isolated power supplies, TI AMC1200/AMC1200B prevents noise currents on a high common-mode voltage line from entering the local ground and interfering with or damaging sensitive circuitry. The input of the AMC1200/AMC1200B is optimized for direct connection to shunt resistors or other low voltage level signal sources. The excellent performance of the device supports accurate current control resulting in system-level power saving and (especially in motor-control applications) lower torque ripple. TI AMC1200/AMC1200B fully differential isolation amplifiers feature a ±250mV input voltage range optimized for shunt resistors.
Features
- ±250-mV input voltage range optimized for shunt resistors
- 0.075% max at 5V very low nonlinearity
- 1.5 mV max. low offset error
- 3.1 mVRMS typ. low noise
- 8mA max. at 5V low high-side supply current
- 60kHz min. input bandwidth
- 8 (0.5% accuracy) fixed gain
- 108dB high common-mode rejection ratio
- 3.3-V operation on low-Side
- Certified galvanic isolation:
- UL1577 and IEC60747-5-2 approved
- 4250 VPEAK (AMC1200B) / 4000VPEAK (AMC1200) isolation voltage
- 1200VPEAK working voltage
- 10kV/µs min. transient immunity
- Typical 10-year lifespan at rated working voltage
- Fully specified over the extended industrial temperature range
Applications
- Shunt resistor based current sensing in:
- Motor control
- Green energy
- Frequency inverters
- Uninterruptible power supplies
Functional Diagram
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