ADuM7801

RECOMMENDED FOR NEW DESIGNS

25MHz Isolated ADC with Sigma-Delta Modulated Bit Stream Output

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • 5MHz to 25MHz main clock input frequency
  • 16 bits, no missing codes
  • Full-scale analog input voltage range: ±320mV
  • SNR: 88dB typical
  • High isolation common-mode transient immunity: 200kV/μs minimum
  • Offset drift vs. temperature: ±0.30μV/°C maximum
  • Gain error drift vs. temperature: ±28ppm/°C maximum
  • Integrated digital isolator
  • Operating temperature range: −40°C to +125°C
  • Wide-body SOIC
    • 8-lead SOIC_IC
  • Safety and regulatory approvals
    • UL 1577 (pending)
      • VISO = 5700V rms for 1minute
    • IEC/EN/CSA 62368-1 (pending)
    • IEC/CSA 61010-1 (pending)
  • DIN EN IEC 60747-17 (VDE 0884-17) (pending)
    • VIORM = 2121V peak

The ADuM7801 is a high-performance isolated analog-to-digital converter (ADC) with a second-order Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler ® technology. The device operates from a 4.0V to 5.5V power supply range (high-side supply voltage, VDD1) and accepts a pseudodifferential input signal of ±250mV (±320mV full-scale). The pseudodifferential input is ideally suited for shunt-resistor current monitoring in high voltage applications where galvanic isolation is required.

The analog input is continuously sampled by a high-performance analog modulator and converted to a pulse density modulation digital output stream with a data rate of up to 26MHz. The analog input can be reconstructed with an appropriate sinc3 digital filter to achieve an 88dB signal-to-noise ratio (SNR) at 97.6kSPS with a 256 decimation rate and a 25MHz input clock. The serial input and output operates from a 3V to a 5.5V supply (controller-side supply voltage, VDD2).

The serial interface is digitally isolated. High speed complementary metal-oxide semiconductor (CMOS) technology, combined with monolithic transformer technology, results in the on-chip isolation providing outstanding performance characteristics, superior to alternatives such as optocoupler devices.

The ADuM7801 device is available in a 8-lead SOIC_IC package and has an operating temperature range of −40°C to +125°C.

APPLICATIONS

  • Shunt current monitoring
  • AC motor controls
  • Power and solar inverters
  • Wind turbine inverters
  • Analog-to-digital and opto-isolator replacement
ADuM7801
25MHz Isolated ADC with Sigma-Delta Modulated Bit Stream Output
ADUM7801 Functional Block Diagram ADUM7801 Typical Application Diagram ADuM7801 Pin Configuration ADuM7801 Chip Illustration
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Documentation

Data Sheet 1

User Guide 1

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Evaluation Kits

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EVAL-ADuM7801

Evaluating the ADuM7801, 8-Lead SOIC 25MHz Isolated ADC with Sigma-Delta Modulated Bit Stream Output

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Features and Benefits

  • Simplified evaluation of the ADuM7801 isolated ADC with Σ-Δ modulated bit stream output
  • Footprint for 6mm × 10mm, 8-lead SOIC_IC package with >8.0mm creepage and clearance
  • On-board power supplies
  • On-board ADuM6028-5 ISO DC-DC converter and ADP7142 low noise CMOS LDO regulator with jumper options for simplified evaluation in multiple supply configurations
  • SMA connectors for MDAT output signal, MCLK input, and VIN+, VIN− analog input signals
  • Resistors and footprints for termination
  • Test points for measuring all signals
  • Standalone capability
  • ZedBoard™ controller board compatible
  • PC-based software for control and data analysis

Product Details

The EV-ADuM7801-8FMCZ is a fully-featured evaluation board that allows the user to evaluate all features of the ADuM7801 isolated ADC with Σ-Δ modulated bit stream output. The ZedBoard Zynq-7000 controller board controls the EV-ADuM7801-8FMCZ by the J9 connector and through the USB port of a PC using the ACE Software. The ACE Software is available to download on the ACE Software page.

On-board components include an isolated, 5kV, isoPower® DC-to- DC converter (the ADuM6028-5), a 5V, low noise, low dropout (LDO) regulator (the ADP7104), and a 200mA, 40V, low noise, LDO regulator (the ADP7142).

This user guide explains how to use the EV-ADuM7801-8FMCZ to evaluate the ADuM7801. The ADuM7801 is a high-performance isolated analog-to-digital converter (ADC) with a second-order Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The device operates from a 4.0V to 5.5V power supply range (high-side supply voltage, VDD1) and accepts a pseudodifferential input signal of ±250mV (±320mV full-scale). The pseudodifferential input is ideally suited for shunt-resistor current monitoring in high voltage applications where galvanic isolation is required.

The analog input is continuously sampled by a high-performance analog modulator and converted to a pulse density modulation digital output stream with a data rate of up to 25MHz. The analog input can be reconstructed with an appropriate sinc3 digital filter to achieve an 88dB signal-to-noise ratio (SNR) at 97.6kSPS with a 256 decimation rate and a 25MHz input clock. The serial input and output operates from a 3V to a 5.5V supply (controller-side supply voltage, VDD2).

The serial interface is digitally isolated. The on-chip isolation provides performance characteristics superior to alternatives, such as optocoupler devices, due to high speed CMOS technology combined with monolithic transformer technology. The ADuM7801

Full specifications on the ADuM7801 are available in the ADuM7801 has an operating temperature range of −40°C to +125°C.

data sheet available from Analog Devices, Inc., and must be consulted with this user guide when using the EV-ADuM7801- 8FMCZ evaluation board.
EVAL-ADuM7801
Evaluating the ADuM7801, 8-Lead SOIC 25MHz Isolated ADC with Sigma-Delta Modulated Bit Stream Output
EVAL ADUM7801 Evaluation Board Angle View EVAL ADUM7801 Evaluation Board Bottom View EVAL ADUM7801 Evaluation Board Top View

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