EVAL-CN0216-SDPZ Analog Devices, EVAL-CN0216-SDPZ Datasheet

EVAL-CN0216-SDPZ

Manufacturer Part Number

EVAL-CN0216-SDPZ

Description

EVALBOARD/CN0216

Manufacturer

Analog Devices

Datasheet

1.EVAL-CN0216-SDPZ.pdf (5 pages)

Specifications of EVAL-CN0216-SDPZ

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 in Figure 1 is a precision weigh scale signal

conditioning system. It uses the AD7791, a low power buffered

24-bit sigma-delta ADC along with two external

zero-drift amplifiers. This solution allows for high dc gain with

a single supply.

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-0216 Circuit Evaluation Board (EVAL-CN0216-SDPZ)

System Demonstration Platform (EVAL-SDP-CB1Z)

Schematics, Layout Files, Bill of Materials

TEDEA HUNTLEIGH

505H-0002-F070

Precision Weigh Scale Design Using the

LOAD CELL:

OUT–

10µF

Figure 1. Weigh Scale System Using the

+5.0V

0.1µF

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 www.analog.com/CN0216.

SENSE+

SENSE–

OUT+

with External

ADP3301-5.0

GND

ADA4528-1

60.4Ω

OUT

ERR

R1 11.3kΩ

R2 11.3kΩ

C1 3.3µF

C2 3.3µF

ADA4528-1

0.1µF

+5.0V

ADA4528-1

AD7791

4.7µF

(Simplified Schematic, All Connections and Decoupling Not Shown)

R3 1kΩ

R4 1kΩ

5.0V

100pF

10µF

1µF

Zero-Drift Amplifiers

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

Tel: 781.329.4700

Fax: 781.461.3113

Ultralow noise, low offset voltage, and low drift amplifiers are

used at the front end for amplification of the low-level signal

from the load cell. The circuit yields 15.3 bit noise-free code

resolution for a load cell with a full-scale output of 10 mV.

This circuit allows great flexibility in designing a custom low-

level signal conditioning front end that gives the user the ability

to easily optimize the overall transfer function of the combined

sensor-amplifier-converter circuit. The

performance over the complete output data range, from 9.5 Hz

to 120 Hz, which allows it to be used in weigh scale applications

that operate at various low speeds.

AD7791

REFIN(+)

REFIN(–)

AIN(+)

AIN(–)

Devices Connected/Referenced

AD7791

ADA4528-1

ADP3301

AD7791

+5.0V

VDD

GND

24-Bit Sigma-Delta ADC

DOUT/RDY

0.1µF

Low Power, Buffered, 24-Bit Sigma-Delta

ADC

Precision, Ultralow Noise, Rail-to-Rail

Input/Output, Zero-Drift Op Amp

High Accuracy anyCAP® 100 mA Low

Dropout Linear Regulator

SCLK

DIN

10µF

33Ω

SUPPORT CIRCUITS

Circuit Note

AD7791

SDP BOARD

AND

www.analog.com

maintains good

CN-0216

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