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

AMC1203 (ACTIVE)

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

 

Description

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.

Features

  • 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
  • APPLICATIONS
    • Shunt Based Current Sensing in:
      • Motor Control
      • Uninterruptible Power Supplies
      • Power Inverters
      • Industrial Process Control

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Parametrics Compare all products in Isolated ADC

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Range
Interface
Isolation (kV peak)
CMTI (Min) (kV/µs)
INL (Max) (+/-LSB)
SNR (dB)
Power Consumption (Typ) (mW)
Architecture
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Digital Supply (Min) (V)
Digital Supply (Max) (V)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
AMC1203 AMC1204
16    16   
40kSPS    78kSPS   
1    1   
250mV    250mV   
Serial    Serial   
4    4.25   
15    15   
6    9   
85    -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   
16SOIC
8SOP   
16SOIC
8SOIC   
3.35 | 1ku    3.45 | 1ku   
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