AD7781BRZ

更新时间： 2024-11-11 06:36:11

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器光电二极管 PC
页数	文件大小	规格书
16页	394K
描述
20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC

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AD7781BRZ 数据手册

20-Bit, Pin-Programmable,

Low Power Sigma-Delta ADC

AD7781

FUNCTIONAL BLOCK DIAGRAM

FEATURES

GND

GAIN

REFIN(+) REFIN(–)

Pin-programmable filter response

Update rate: 10 Hz or 16.7 Hz

Pin-programmable in-amp gain

Pin-programmable power-down and reset

Status function

AIN(+)

DOUT/RDY

SCLK

G = 1

OR 128

20-BIT Σ-Δ

ADC

AIN(–)

Internal clock oscillator

Internal bridge power-down switch

Current

BPDSW

INTERNAL

CLOCK

FILTER

PDRST

AD7781

115 μA typical (gain = 1)

Figure 1.

330 μA typical (gain = 128)

Simultaneous 50 Hz/60 Hz rejection

Power supply: 2.7 V to 5.25 V

−40°C to +105°C temperature range

Independent interface power supply

Packages

14-lead, narrow body SOIC

16-lead TSSOP

2-wire serial interface (read-only device)

SPI compatible

Table 1.

Parameter

Output Data Rate 10 Hz

RMS Noise

C Grade

B Grade

P-P Resolution

C Grade

Gain = 128

Gain = 1

10 Hz 16.7 Hz

16.7 Hz

44 nV

55 nV

65 nV

90 nV

2.4 μV

2.7 μV

17.6

17.3

17.1

16.6

18.8

18.7

B Grade

18.8

18.7

Schmitt trigger on SCLK

Settling Time

300 ms

120 ms

300 ms

120 ms

APPLICATIONS

Weigh scales

Pressure measurement

Industrial process control

Portable instrumentation

GENERAL DESCRIPTION

The AD7781 is a complete, low power front-end solution for

bridge sensor products, including weigh scales, strain gages,

and pressure sensors. It contains a precision, low power, 20-bit

sigma-delta (Σ-Δ) ADC, an on-chip, low noise programmable

gain amplifier (PGA), and an on-chip oscillator.

The on-chip PGA has a gain of 1 or 128, supporting a full-scale

differential input of ±± ꢀ or ±3ꢁ mꢀ. The device has two filter

response options. The filter response at the 16.7 Hz update rate

provides superior dynamic performance. The settling time is

120 ms at this update rate. At the 10 Hz update rate, the filter

response provides better than −4± dB of stop-band attenuation.

In load cell applications, this stop-band rejection is useful to

reject low frequency mechanical vibrations of the load cell. The

settling time is 300 ms at this update rate. Simultaneous ±0 Hz/

60 Hz rejection occurs at both the 10 Hz and 16.7 Hz update rates.

Consuming only 330 μA, the AD7781 is particularly suitable for

portable or battery-operated products where very low power is

required. The AD7781 also has a power-down mode that allows

the user to switch off the power to the bridge sensor and power

down the AD7781 when not converting, thus increasing the

battery life of the product.

The AD7781 operates with a power supply from 2.7 ꢀ to ±.2± ꢀ.

It is available in a narrow body, 14-lead SOIC package and in a

16-lead TSSOP package.

For ease of use, all the features of the AD7781 are controlled by

dedicated pins. Each time that a data read occurs, eight status bits

are appended to the 20-bit conversion. These status bits contain a

pattern sequence that can be used to confirm the validity of the

serial transfer.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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AD7781BRZ 替代型号

型号	品牌	替代类型	描述	数据表
AD7781BRZ-REEL	ADI	类似代替	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
AD7781BRUZ-REEL	ADI	类似代替	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
AD7781BRUZ	ADI	功能相似	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC

与AD7781BRZ相关器件

型号	品牌	获取价格	描述	数据表
AD7781BRZ-REEL	ADI	获取价格	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
AD7781CRUZ	ADI	获取价格	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
AD7781CRUZ-REEL	ADI	获取价格	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
AD7781CRZ	ADI	获取价格	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
AD7781CRZ-REEL	ADI	获取价格	20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
AD7782	ADI	获取价格	Read Only, Pin Configured 24-Bit ADC
AD7782BRU	ADI	获取价格	Read Only, Pin Configured 24-Bit ADC
AD7782BRU-REEL	ROCHESTER	获取价格	2-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16, PLASTIC, TSSOP-16
AD7782BRU-REEL7	ADI	获取价格	IC 2-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16, PLASTIC, TSSOP-16, Analog to Digita
AD7782BRUZ	ADI	获取价格	2-Channel, Read-Only, Pin-Configured, 24-bit Sigma-Delta ADC

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