AMC1204 Isolated Delta-Sigma Modulator

By Texas Instruments 187

AMC1204 Isolated Delta-Sigma Modulator

Texas Instruments' AMC1204 is a 1-bit digital output, isolated delta-sigma (ΔΣ) modulator that can be clocked at up to 20 MHz. The digital isolation of the modulator output is provided by a silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference. This barrier has been certified to provide basic galvanic isolation of up to 4000 VPEAK according to UL1577, IEC60747-5-2, and CSA standards or specifications. The AMC1204 provides a single-chip solution for measuring the small signal of a shunt resistor across an isolated barrier. These types of resistors are typically used to sense currents in motor control inverters, green energy generation systems, and other industrial applications. The AMC1204 differential inputs easily connect to the shunt resistor or other low-level signal sources.

  • ±250 mV input voltage range optimized for shunt resistors
  • Certified digital isolation:
    • CSA, IEC60747-5-2, and UL1577 approved
    • Isolation voltage: 4000 VPEAK
    • Working voltage: 1200 VPEAK
    • Transient immunity: 15 kV/µs
  • Long isolation barrier lifetime (see Application Report SLLA197)
  • High electromagnetic field immunity
  • Outstanding AC performance:
    • SNR: 84dB (min)
    • THD: -80dB (max)
  • Excellent DC precision:
    • INL: ±8LSB (max)
    • Gain Error: ±2% (max)
  • External clock input for easier synchronization
  • Fully specified over the extended industrial temperature range
  • Shunt resistor based current sensing in:
    • Motor control
    • Green energy
    • Inverter applications
    • Uninterruptible power supplies

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