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| Kit Overview
The EVAL-CN0185-EB1ZEVAL-CN0185-EB1Z is a Novel Analog-to-Analog Isolator Using an Isolated Sigma-Delta Modulator, Isolated DC-to-DC Converter, and Active Filter. The evaluation circuit is a complete low cost implementation of an analog-to-analog isolator. The circuit provides isolation of 2500 V rms (1 minute per UL 1577)
The evaluation circuit is based on the AD7400AAD7400A, a second order, sigmadelta modulator with a digitally isolated 1-bit data stream output. The isolated analog signal is recovered with a fourthorder active filter based on the dual, low noise, rail-to-rail AD8646AD8646 op amp. With the ADuM5000ADuM5000 as the power supply for the isolated side, the two sides are completely isolated and use only one power supply for the system. The circuit has 0.05% linearity and benefits from the noise shaping provided by the modulator of the AD7400A and the analog filter. The circuit’s applications include motor control and shunt current monitoring, and it is a good alternative to isolation systems based on opto-isolators.
The ADuM5000ADuM5000 is an isolated dc-to-dc converter based on Analog Devices iCoupler
The AD7400AAD7400A is a second-order, Σ-Δ modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc., iCoupler
Key Applications: Application Specific Motor Control, Electronic Test & Measurement, Field Instruments/ Smart Transmitters | |||||||||||
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Development Tools
- Multifunction calibrator (dc source), Fluke 5700A5700A or equivalent
- Digital multimeter, Agilent 3458A3458A, 8.5 digits or equivalent
- Spectrum analyzer, Agilent 4396B or equivalent
- Function generator, Agilent 33250A33250A or equivalent
- Power supply, +6 V
Technical Documents
Learning Center
Design Elements
| Type | Description |
|---|---|
| Schematics | ADI: Schematics for EVAL-CN0185-EB1Z Evaluation Board |
| Layout | ADI: Layout File for EVAL-CN0185-EB1Z |
| BOM | ADI: BOM File for EVAL-CN0185-EB1Z Evaluation Board |
Video
| Video1 | Video2 |
|---|---|
Kit Features
Features of EVAL-CN0185-EB1ZEVAL-CN0185-EB1Z Evaluation Board:
- Complete low cost implementation of an analog-to-analog isolator.
- Circuit based on the AD7400AAD7400A, a second order, sigmadelta modulator with a digitally isolated 1-bit data stream output.
- 10 MHz clock rate
- 16 bits, no missing codes
- ±2 LSB INL typical at 16 bits
- 1.5 μV/°C typical offset drift
- On-board digital isolator
- On-board reference
- ±250 mV analog input range
- Low power operation: 15.5 mA typical at 5.5 V
- The isolated analog signal is recovered with a fourthorder active filter based on the dual, low noise, rail-to-rail AD8646AD8646 opamp
- Offset voltage: 2.5 mV maximum
- Wide bandwidth: 24 MHz
- Slew rate: 11 V/μs
- Short-circuit output current: 120 mA Qualified for automotive applications No phase reversal Low input bias current: 1 pA
- Low supply current per amplifier: 2 mA maximum
- Unity gain stable
- ADuM5000ADuM5000 acts as the power supply for the isolated side, the two sides are completely isolated and use only one power supply for the system
- isoPower integrated, isolated dc-to-dc converter
- Regulated 3.3 V or 5 V output
- Up to 500 mW output power
- 7.6 mm creepage
- Thermal overload protection
- The circuit has 0.05% linearity and benefits from the noise shaping provided by the modulator of the AD7400A and the analog filter
- The circuit can be used for isolated voltage monitoring and also for current sensing applications where the voltage across a shunt resistor is monitored.
Kit Contents
The Analog Devices EVAL-CN0185-EB1ZEVAL-CN0185-EB1Z supplied with below contents:
- EVAL-CN0185-EB1ZEVAL-CN0185-EB1Z Evaluation Board