Datasheet > AD7795

AD7795

更新时间： 2024-11-24 01:13:51

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
37页	767K
描述
6-Channel, Low Noise, Low Power

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AD7795 数据手册

6-Channel, Low Noise, Low Power, 24-/16-Bit

∑-Δ ADC with On-Chip In-Amp and Reference

AD7794/AD7795

Industrial process control

Instrumentation

Blood analysis

FEATURES

Up to 23 effective bits

RMS noise: 40 nV @ 4.17 Hz, 85 nV @ 16.7 Hz

Current: 400 μA typical

Smart transmitters

Liquid/gas chromatography

6-digit DVM

Power-down: 1 μA maximum

Low noise, programmable gain, instrumentation amp

Band gap reference with 4 ppm/°C drift typical

Update rate: 4.17 Hz to 470 Hz

Six differential analog inputs

Internal clock oscillator

Simultaneous 50 Hz/60 Hz rejection

Reference detect

Programmable current sources

On-chip bias voltage generator

Burnout currents

Low-side power switch

Power supply: 2.7 V to 5.25 V

Temperature range:

B grade: –40°C to +105°C

C grade: –40°C to +125°C

GENERAL DESCRIPTION

The AD7794/AD7795 are low power, low noise, complete

analog front ends for high precision measurement applications.

They contain a low noise, 24-/16-bit ∑-Δ ADC with six

differential inputs. The on-chip low noise instrumentation

amplifier means that signals of small amplitude can be

interfaced directly to the ADC.

Each device contains a precision, low noise, low drift internal

band gap reference, and can also accept up to two external

differential references. Other on-chip features include

programmable excitation current sources, burnout currents,

and a bias voltage generator that is used to set the common-

mode voltage of a channel to AV_DD/2. The low-side power

switch can be used to power down bridge sensors between

conversions, minimizing the system’s power consumption. The

AD7794/AD7795 can operate with either an internal clock or

an external clock. The output data rate from each part can vary

from 4.17 Hz to 470 Hz.

Independent interface power supply

24-lead TSSOP

3-wire serial interface

SPI®, QSPI™, MICROWIRE™, and DSP compatible

Schmitt trigger on SCLK

Both parts operate with a power supply from 2.7 V to 5.25 V.

The B-grade parts (AD7794 and AD7795) are specified for a

temperature range of −40°C to +105°C while the C-grade part

(AD7794) is specified for a temperature range of −40°C to

+125°C. They consume a current of 400 μA typical and are

housed in a 24-lead TSSOP.

APPLICATIONS

Temperature measurement

Pressure measurement

Weigh scales

Strain gage transducers

Gas analysis

FUNCTIONAL BLOCK DIAGRAM

AIN4(+)/REFIN2(+) REFIN1(+) AIN4(–)/REFIN2(–) REFIN1(–)

GND

REFERENCE

DETECT

BIAS

BAND GAP

REFERENCE

GND

AIN1(+)

AIN1(–)

DOUT/RDY

DIN

SERIAL

INTERFACE

AND

Σ-Δ

ADC

AIN2(+)

BUF

IN-AMP

SCLK

AIN2(–)

LOGIC

CONTROL

AIN3(+)

MUX

AIN3(–)

GND

AIN5(+)/IOUT2

AIN5(–)/IOUT1

AIN6(+)/P1

AIN6(–)/P2

TEMP

SENSOR

INTERNAL

CLOCK

AD7794/AD7795

AD7794: 24-BIT ADC

AD7795: 16-BIT ADC

PSW

GND

CLK

Figure 1.

Rev. D

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 www.analog.com

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与AD7795相关器件

型号	品牌	获取价格	描述	数据表
AD7795_15	ADI	获取价格	6-Channel, Low Noise, Low Power
AD7795BRUZ	ADI	获取价格	6-Channel, Low Noise, Low Power, 16-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
AD7795BRUZ1	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î
AD7795BRUZ-REEL	ADI	获取价格	6-Channel, Low Noise, Low Power, 16-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
AD7795BRUZ-REEL1	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î
AD7796	ADI	获取价格	Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors
AD7796_15	ADI	获取价格	Low Power, 16-/24-Bit Sigma-Delta ADC
AD7796BRUZ	ADI	获取价格	Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors
AD7796BRUZ-REEL	ADI	获取价格	Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors
AD7797	ADI	获取价格	Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors

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