AMC1204BDC Delta-Sigma Modulator

By Texas Instruments 189

AMC1204BDC Delta-Sigma Modulator

Texas Instruments' AMC1204B (4250VPEAK) 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 AMC1204B differential inputs easily connect to the shunt resistor or other low-level signal sources. An internal reference eliminates the need for external components. When used with an appropriate external digital filter, an effective number of bits (ENOB) of 14 can be achieved at a data rate of 78 kSPS.

A 5 V analog supply (AVDD) is used by the modulator while the isolated digital interface operates from a 3 V, 3.3 V, or 5 V supply (DVDD). The AMC1204B is available in a SO-16 (DW) package and is specified from -40°C to +105°C.

  • ±250 mV input voltage range optimized for shunt resistors
  • Certified digital isolation:
    • CSA, IEC60747-5-2, and UL1577 approved
    • Isolation voltage: 4250 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: 84 dB (min)
    • THD: -80 dB (max)
  • High-voltage motor control
  • Power inverter
  • Wind turbine
  • Uninterruptible power supply (UPS)

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