EVAL-CN0185-EB1Z Analog Devices, EVAL-CN0185-EB1Z Datasheet

EVAL-CN0185-EB1Z

Manufacturer Part Number

EVAL-CN0185-EB1Z

Description

EVALBOARD/CN0185-EB1Z

Manufacturer

Analog Devices

Datasheet

1.EVAL-CN0185-EB1Z.pdf (4 pages)

Specifications of EVAL-CN0185-EB1Z

Pack_quantity

Comm_code

85437090

Lead_time

Eccn

EAR99

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EVALUATION AND DESIGN SUPPORT

Circuit Evaluation Boards

Design and Integration Files

CIRCUIT FUNCTION AND BENEFITS

The circuit shown in Figure 1 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).

Rev.0

Circuits from the Lab™ circuits from Analog Devices have been designed and built by Analog Devices

engineers. Standard engineering practices have been employed in the design and construction of

each circuit, and their function and performance have been tested and verified in a lab environment at

room temperature. However, you are solely responsible for testing the circuit and determining its

suitability and applicability for your use and application. Accordingly, in no event shall Analog Devices

be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause

whatsoever connected to the use of any Circuits from the Lab circuits. (Continued on last page)

CN-0185 Circuit Evaluation Board (EVAL-CN0185-EB1Z)

Schematics, Layout Files, Bill of Materials

A Novel Analog-to-Analog Isolator Using an Isolated Sigma-Delta

–

Modulator, Isolated DC-to-DC Converter, and Active Filter

Circuits from the Lab™ reference circuits are engineered and

tested for quick and easy system integration to help solve today’ s

analog, mixed-signal, and RF design challenges. For more

information and/or support, visit

Figure 1. Analog Isolator using AD7400A (Simplified Schematic: All Connections and Decoupling Not Shown)

22Ω

GND_ISO

0.1µF

+5V_ISO

GND_ISO

VISO

GNDISO

VSEL

VISO

GNDISO

VDD1

VIN+

VIN–

GND1

ADuM5000

AD7400A

MCLKOUT

RCOUT

RCSEL

MDAT

GND2

VDD2

GND1

VDD1

RCIN

www.analog.com/CN0185.

24kΩ

+3.3V

68pF

24kΩ

ADP121-3.3

VOUT

GND

VIN

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

The circuit is based on the AD7400A, a second order, sigma-

delta 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

AD8646

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.

100pF

AD8646

+5V

22Ω

1/2

Devices Connected/Referenced

AD7400A

ADuM5000

AD8646

ADP121

ADP3301

op amp. With the

ADP3301-5

VOUT

GND

51kΩ

8.2pF

VIN

51kΩ

Isolated Sigma-Delta Modulator

Isolated DC-to-DC Converter

Dual, 24 MHz Rail-to-Rail I/O Op Amp

150 mA, Low Quiescent Current,

CMOS Linear Regulator

High Accuracy, 100 mA, Low Dropout

Linear Regulator

ADuM5000

100pF

AD8646

22Ω

1/2

POWER IN

+5.5V TO +12V

Circuit Note

as the power supply for

OUT

www.analog.com

CN-0185

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