AMC1100, E-Metering Amplifiers

By Texas Instruments 169

AMC1100, E-Metering Amplifiers

Texas Instruments' AMC1100 is a precision isolation amplifier with an output separated from the input circuitry by a silicon dioxide (SiO2 barrier that is highly resistant to magnetic interference. This barrier is certified to provide galvanic isolation of up to 4250 VPEAK, according to UL1577 and IEC60747-5-2. Used in conjunction with isolated power supplies, this device prevents noise currents on a high common-mode voltage line from entering the local ground and interfering with or damaging sensitive circuitry.

The AMC1100 input is optimized for direct connection to shunt resistors or other low-voltage-level signal sources. The excellent performance of the device enables accurate current and voltage measurement in energy-metering applications. The output signal common-mode voltage is automatically adjusted to either the 3 V or 5 V low-side supply.

The AMC1100 is fully specified over the extended industrial temperature range of -40°C to +105°C and is available in the SMD-type, wide-body SOIC-8 (DWV), and gullwing-8 (DUB) packages.

  • ±250 mV input voltage range optimized for shunt resistors
  • Very low nonlinearity: 0.075% max at 5 V
  • Low offset error: 1.5 mV (max.)
  • Low noise: 3.1 mVRMS typical
  • Low high-side supply current: 8 mA max at 5 V
  • Input bandwidth: 60 kHz (min.)
  • Fixed gain: 8 (0.5% accuracy)
  • High common-mode rejection ratio: 108 dB
  • Low-side operation: 3.3 V
  • Certified galvanic isolation: UL1577 and IEC60747-5-2 approved
    • Isolation voltage: 4250 VPEAK
    • Working voltage: 1200 VPEAK
    • Transient immunity: 2.5 kV/µs (min.)
  • Typical 10-year life span at rated working voltage
  • Fully specified over the extended industrial temperature range