Small Basic Isolated Delta-Sigma Modulator With ±50mV Input and CMOS Interface


Product details


Input range (Vp-p) 50mV Interface type Serial CMOS Sample rate (Max) (MSPS) 21 Rating Catalog Isolation (kV peak) 5.657 CMTI (Min) (kV/µs) 15 Number of input channels 1 Architecture Delta-Sigma SNR (dB) 82.5 Operating temperature range (C) -40 to 125 INL (Max) (+/-LSB) 4 Power consumption (Typ) (mW) 45 open-in-new Find other Isolated ADCs

Package | Pins | Size

SOIC (DWV) 8 67 mm² 5.85 x 11.5 open-in-new Find other Isolated ADCs


  • ±50-mV input voltage range optimized for current measurement with shunt resistors
  • Manchester coded or uncoded bitstream options
  • Excellent DC performance for high-precision sensing on system level:
    • Offset error and drift: ±50 µV, ±1 µV/°C (max)
    • Gain error and drift: ±0.2%, ±40 ppm/°C (max)
  • 3.3-V operation for reduced power dissipation on both sides of the isolation barrier
  • System-level diagnostic features
  • High electromagnetic field immunity
    (see the ISO72x Digital Isolator Magnetic-Field Immunity application report)
  • Safety-related certifications:
    • 5657-VPK basic isolation per DIN VDE V 0884-11: 2017-01
    • 4000-VRMS isolation for 1 minute per UL1577
    • CAN/CSA No. 5A-component acceptance service notice
      and DIN EN 61010-1 end equipment standard

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The AMC1106 is a precision, delta-sigma (ΔΣ) modulator with the output separated from the input circuitry by a capacitive isolation barrier that is highly resistant to magnetic interference.

The input stage of the AMC1106 is optimized for direct connection to shunt resistors or other low voltage-level signal sources commonly used in multi-phase electricity meters to achieve excellent ac and dc performance. The device low input voltage range of ±50-mV allows use of small shunt resistor values to minimize power dissipation. Decimate the output bitstream of the AMC1106 with an appropriate digital filter. The MSP430F67x, TMS320F2807x, and TMS320F2837x microcontrollers, and the AMC1210 integrate these digital filters for seamless operation with the AMC1106.

On the high-side, the modulator is supplied by a
3.3-V or 5-V power supply (AVDD). The isolated digital interface operates from a 3.0-V, 3.3-V, or 5-V power supply (DVDD).

The AMC1106 is specified over the extended industrial temperature range of –40°C to +125°C.

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Technical documentation

Design & development

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Hardware development

The AMC1306 devices are 1-bit modulators with an output buffer separated from the input interface circuitry by a silicon dioxide (SiO2) isolation barrier. The isolation barrier provides galvanic isolation of up to 8000 VPEAK. When used in combination with an FPGA or other digital filter, AMC1306 (...)
  • Full-featured evaluation board for the AMC1306 single-channel delta-sigma modulators
  • Configurable AVDD and DVDD power supplies
  • Screw terminals for easy access to analog inputs and digital outputs

Design tools & simulation

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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)

Reference designs

Isolated Shunt Current Measurement with Standalone Digital Filters Reference Design
TIDA-01639 — This reference design implements a class 0.5 three phase energy measurement system with isolated shunt sensors by using isolated modulators and independent digital filters, enabling a wider choice of host microcontrollers (MCU) as integrated sync filters are no longer required. In this design (...)
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