Datasheet > AD7730L_15

AD7730L_15

更新时间： 2024-11-05 01:19:55

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
53页	321K
描述
Bridge Transducer ADC

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数据手册

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AD7730L_15 数据手册

Bridge Transducer ADC

AD7730/AD7730L

T he modulator output is processed by a low pass programmable

digital filter, allowing adjustment of filter cutoff, output rate and

settling time.

KEY FEATURES

Resolution of 230,000 Counts (Peak-to-Peak)

Offset Drift: 5 nV/ ꢀC

Gain Drift: 2 ppm / ꢀC

T he part features two buffered differential programmable gain

analog inputs as well as a differential reference input. T he part

operates from a single +5 V supply. It accepts four unipolar

analog input ranges: 0 mV to +10 mV, +20 mV, +40 mV and

+80 mV and four bipolar ranges: 10 mV, 20 mV, 40 mV

and 80 mV. T he peak-to-peak resolution achievable directly

from the part is 1 in 230,000 counts. An on-chip 6-bit DAC

allows the removal of T ARE voltages. Clock signals for synchro-

nizing ac excitation of the bridge are also provided.

Line Frequency Rejection: >150 dB

Buffered Differential Inputs

Program m able Filter Cutoffs

Specified for Drift Over Tim e

Operates w ith Reference Voltages of 1 V to 5 V

ADDITIONAL FEATURES

Tw o-Channel Program m able Gain Front End

On-Chip DAC for Offset/ TARE Rem oval

FASTStep™ Mode

AC or DC Excitation

Single Supply Operation

T he serial interface on the part can be configured for three-wire

operation and is compatible with microcontrollers and digital

signal processors. T he AD7730 contains self-calibration and

system calibration options, and features an offset drift of less

than 5 nV/°C and a gain drift of less than 2 ppm/°C.

APPLICATIONS

Weigh Scales

Pressure Measurem ent

T he AD7730 is available in a 24-pin plastic DIP, a 24-lead

SOIC and 24-lead T SSOP package. T he AD7730L is available

in a 24-lead SOIC and 24-lead T SSOP package.

GENERAL D ESCRIP TIO N

T he AD7730 is a complete analog front end for weigh-scale and

pressure measurement applications. T he device accepts low-

level signals directly from a transducer and outputs a serial

digital word. T he input signal is applied to a proprietary pro-

grammable gain front end based around an analog modulator.

NO TE

T he description of the functions and operation given in this data

sheet apply to both the AD7730 and AD7730L. Specifications

and performance parameters differ for the parts. Specifications

for the AD7730L are outlined in Appendix A.

FUNCTIO NAL BLO CK D IAGRAM

REF IN(–)

REF IN(+)

AD7730

REFERENCE DETECT

VBIAS

100nA

STANDBY

SYNC

AIN1(+)

AIN1(–)

SIGMA-DELTA A/D CONVERTER

BUFFER

SIGMA-

DELTA

PROGRAMMABLE

DIGITAL

MODULATOR

FILTER

MUX

PGA

+/–

100nA

AGND

AIN2(+)/D1

AIN2(–)/D0

MCLK IN

CLOCK

GENERATION

6-BIT

DAC

SERIAL INTERFACE

AND CONTROL LOGIC

MCLK OUT

SCLK

CALIBRATION

MICROCONTROLLER

DIN

ACX

DOUT

EXCITATION

CLOCK

ACX

AGND

DGND

POL

RDY

RESET

FASTStep is a trademark of Analog Devices, Inc.

REV.

Inform ation furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assum ed by Analog Devices for its

use, nor for any infringem ents of patents or other rights of third parties

which m ay result from its use. No license is granted by im plication or

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/ 329-4700 World Wide Web Site: http:/ / w w w .analog.com

781/461-3113

2012

Fax:

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与AD7730L_15相关器件

型号	品牌	获取价格	描述	数据表
AD7730LBR	ADI	获取价格	Bridge Transducer ADC
AD7730LBR-REEL	ADI	获取价格	IC 2-CH DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24, SOIC-24, Analog to Digital Converter
AD7730LBR-REEL7	ADI	获取价格	Bridge Transducer ADC
AD7730LBRU	ADI	获取价格	Bridge Transducer ADC
AD7730LBRU-REEL	ADI	获取价格	Bridge Transducer ADC
AD7730LBRU-REEL7	ADI	获取价格	Bridge Transducer ADC
AD7730LBRUZ	ADI	获取价格	Bridge Transducer ADC
AD7730LBRUZ-REEL	ADI	获取价格	Bridge Transducer ADC
AD7730LBRUZ-REEL7	ADI	获取价格	Bridge Transducer ADC
AD7730LBRZ	ADI	获取价格	Bridge Transducer ADC

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