AMC1204BDC Delta-Sigma Modulator

Texas Instruments' 16-Bit, 20 MHz isolated Δ-Σ modulator, ideal for current shunt measurements

Texas Instruments 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.

Features Applications
  • ±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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Part Number
Texas Instruments
Part Number
296-34965-5-ND AMC1204BDW IC DELTA-SIGMA MOD 16BIT 16SOIC AMC1204B Datasheet

Evaluation Module
Part Number
Texas Instruments
Part Number
296-29088-ND AMC1204EVM EVAL MODULE FOR AMC1204 AMC1204EVM User's Guide