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


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

All other trademarks are the property of their respective owners

View more

Parametrics Compare all products in Isolated ADC

Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Range
Isolation (kV peak)
CMTI (Min) (kV/µs)
INL (Max) (+/-LSB)
SNR (dB)
THD (Max) (dB)
Power Consumption (Typ) (mW)
Analog Voltage AV/DD (Min) (V)
Analog Voltage AV/DD (Max) (V)
Digital Supply (Min) (V)
Digital Supply (Max) (V)
Operating Temperature Range (C)
Approx. Price (US$)
AMC1203 AMC1204
16     16    
40kSPS     78kSPS    
1     1    
±250mV     ±250mV    
Serial     Serial    
4     4.25    
15     15    
6     9    
85     84    
-88     -80    
80     88    
Delta-Sigma     Delta-Sigma    
4.5     4.5    
5.5     5.5    
4.5     3    
5.5     5.5    
Catalog     Catalog    
-40 to 105     -40 to 125    
3.35 | 1ku     3.45 | 1ku    

Featured tools and software