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====== EVAL-CN0185-EB1Z Overview ======

[[ADI>CN0185]]  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 circuit is based on the [[adi>AD7400A|AD7400A]] , a second-order, sigma-delta (Σ-Δ) modulator with a digitally isolated 1-bit data stream output. The isolated analog signal is recovered with a fourth-order active filter based on the dual, low noise, rail-to-rail [[adi>AD8646|AD8646]] op amp. With the [[adi>ADuM5000|ADuM5000]] 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 [[adi>AD7400A|AD7400A]] and the analog filter. The applications of the circuit include motor control and shunt current monitoring, and the circuit is also a good alternative to isolation systems based on optoisolators.

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{{:resources:eval:user-guides:circuits-from-the-lab:cn0185-hw-1024.jpg|}}

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===== Equipment Needed (Equivalents Can be Substituted) =====

  * EVAL-CN0185-EB1Z Board
  * A multifunction calibrator (dc source), Fluke 5700A
  * A digital multimeter, Agilent 3458A, 8.5 digits 
  * A spectrum analyzer, Agilent 4396B
  * A function generator, Agilent 33250A
  * Oscilloscope
  * A power supply, +6 V 
 
===== General Setup =====

  * Connect the +6V power supply to the CN0185 power terminal J4
  * Connect DC source or Function generator to VIN+ and VIN-
  * Connect digital multimeter / spectrum analyzer or oscilloscope to output terminal  
        
===== Test Setup Functional Block Diagram =====
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==== DC Input Voltage Measurements ====
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{{:resources:eval:user-guides:circuits-from-the-lab:dc.png|}}
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==== Frequency Response Measurements ====
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{{:resources:eval:user-guides:circuits-from-the-lab:freqres.png|}}
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<note>Signal Generator Settings: \\  Output Waveform: Sinewave \\ Amplitude: ±20mV (40mVp-p) \\ DC Offset: 0</note>

===== Connectors and Jumper Configurations =====

{{:resources:eval:user-guides:circuits-from-the-lab:cn0185connectors.png|}} 
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1 - Connect the +6V power supply to this screw terminal (J4) \\ 
2 - Connect the GND terminal of the +6V power supply to this screw terminal (J4) \\ 
3 - Connect the positive analog input signal to this SMB connector (J1) \\ 
4 - Connect the negative analog input signal to this SMB connector (J2) \\ 
5 - LK2 jumper Pins 1 and 2 provides the connection of the positive analog input signal to the AD7400 and pins 2 and 3 puts the input to ground \\ 
6 - LK1 jumper Pins 1 and 2 provides the connection of the negative analog input signal to the AD7400 and pins 2 and 3 puts the input to ground \\ 
7 - Connect the Digital multimeter if measuring dc input and Spectrum analyzer/oscilloscope if measuring frequency response to this SMB connector (J3) \\ 
<note>The output is available through the J3 SMB connector or test point OUT</note>

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===== Schematic, PCB Layout, Bill of Materials =====

<WRAP round 80% download>

[[adi>media/en/reference-design-documentation/design-integration-files/CN0185-DesignSupport.zip|EVAL-CN0185-EBZ Design & Integration Files]]
  * Schematics 
  * PCB Layout 
  * Bill of Materials 
  * PADS project
</WRAP>

=====Registration===== 
<WRAP round tip 80% >
Receive software update notifications, documentation updates, view the latest videos, and more when you register your hardware.  [[reg>EVAL-CN0185-EB1Z?&v=Rev B|Register]] to receive all these great benefits and more!</WRAP>

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