AMC1203 1-Bit, 10MHz, 2nd-Order, Isolated Delta-Sigma Modulator |

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1-Bit, 10MHz, 2nd-Order, Isolated Delta-Sigma Modulator



The AMC1203 is a 1-bit, 10MHz, isolated delta-sigma (ΔΣ) modulator with an output buffer separated from the input interface circuitry by a silicon dioxide (SiO2) isolation barrier. This barrier provides galvanic isolation of up to 4000VPEAK. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.

The AMC1203 modulator operates from a +5V supply with a dynamic range of 95dB. The differential inputs are ideal for direct connection to shunt resistors or other low-level signal sources. With the appropriate digital filter and modulator rate, the device can be used to achieve 16-bit analog-to-digital (A/D) conversion with no missing codes. An effective resolution of 14 bits and an SNR of 85dB (typical) can be maintained with a sinc3 filter with a decimation ratio of 256.

The modulator output is translated to a balanced signal and then transferred by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, and then sets or resets a flip-flop and the output circuit accordingly.

The AMC1203 is available in SOP-8 gull-wing, SOP-8, and SOIC-16 packages. The AMC1203 is characterized for operation over the ambient temperature range of –40°C to +105°C.


  • 16-Bit Resolution
  • SNR: 80.5dB min
  • THD: –88dB max (AMC1203B)
  • ±280mV Input Range with +5V Supply
  • Internal 2.5V Reference Voltage: 1% Accuracy
  • Gain Error: ±1% (AMC1203B)
  • UL1577, IEC60747-5-2 (VDE0884, Rev. 2), and IEC61010-1 Approved
    • Isolation: 4000VPEAK,
      Working Voltage: 560V
    • Transient Immunity: 15kV/µs
  • Typical 25-Year Life at Rated Working Voltage
    (see Application Report SLLA197)
  • Specified Temperature Range:
    –40°C to +105°C
    • Shunt Based Current Sensing in:
      • Motor Control
      • Uninterruptible Power Supplies
      • Power Inverters
      • Industrial Process Control

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Part number Order Input range (Vp-p) Interface Sample rate (Max) (MSPS) Rating Resolution (Bits) Isolation (kV peak) CMTI (Min) (kV/µs) Number of input channels Architecture SNR (dB) Power consumption (Typ) (mW) INL (Max) (+/-LSB) Operating temperature range (C)
AMC1203 Order now ±250mV     Serial     0.04     Catalog     16     4     15     1     Delta-Sigma     85     80     6     -40 to 105    
AMC1204 Order now ±250mV     Serial     0.078     Catalog     16     4.25     15     1     Delta-Sigma     -80     88     9     -40 to 125