TI AMC1204QDWRQ1

The AMC1204-Q1 is a 1-bit digital output, isolated delta-sigma (ΔΣ) modulator with a clock frequency of up to 20MHz. Digital isolation of the modulator output is provided by a silicon dioxide (SiO₂) barrier with extremely high immunity to magnetic interference. This isolation barrier provides basic galvanic isolation of up to 4250V in accordance with UL1577, IEC60747-5-2, and CSA standards or specifications. The AMC1204-Q1 provides a single-chip solution for small-signal measurement across a shunt resistor over the full isolation barrier. These types of resistors are commonly used to sense current in motor control inverters, eco-friendly energy generation systems, and other industrial applications. The AMC1204-Q1 differential input can be easily connected to a 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, 14 effective number of bits (ENOB) can be achieved at a data rate of 78kSPS. The modulator operates from a 5V analog supply (AVDD), while the isolated digital interface can be powered from a 3V, 3.3V, or 5V supply (DVDD). The AMC1204-Q1 is available in a small outline (SO)-16 (DW) package and is rated for a temperature range of -40°C to 125°C.

• Automotive-qualified
• AEC-Q100 qualified with the following results:
  • Device temperature grade 1: ambient operating temperature range –40°C to 125°C
  • Device HBM ESD classification level H2
  • Device CDM ESD classification level C3B
• ±250mV input voltage range optimized for shunt resistors
• Certified digital isolation:
  • Compliant with CSA, IEC60747-5-2, and UL1577
  • Isolation voltage: 4250V
  • Working voltage: 1200V peak
  • Transient immunity: 15kV/μs
• Extended barrier lifetime
• High electromagnetic field immunity
• Excellent AC performance SNR: 84dB (minimum), THD: –80dB (maximum)

• Motor control
• Green energy inverter applications
• Uninterruptible power supplies