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製品の説明
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 Σ-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 AVDD/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. 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
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to 23 effective bits RMS noise: @ 4.17 Hz, 16.7 Hz Current: 400 A typical Power-down: 1 A maximum Low noise, programmable gain, instrumentation amp Band gap reference with 4 ppm/°C drift typical Update rate: 470 Hz Six differential analog inputs Internal clock oscillator Simultaneous Hz/60 Hz rejection Reference detect Programmable current sources On-chip bias voltage generator Burnout currents Low-side power switch Power supply: 5.25 V Temperature range:
B grade: +105°C C grade: to +125°C Independent interface power supply 24-lead TSSOP 3-wire serial interface SPI®, QSPITM, MICROWIRETM, and DSP compatible Schmitt trigger on SCLK
Industrial process control Instrumentation Blood analysis Smart transmitters Liquid/gas chromatography 6-digit DVM
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 - 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 commonmode voltage of a channel to AVDD/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 to 470 Hz.
APPLICATIONSBoth parts operate with a power supply from 5.25 V. The B-grade parts (AD7794 and AD7795) are specified for a temperature range to +105°C while the C-grade part (AD7794) is specified for a temperature range to +125°C. They consume a current 400 A typical and are housed a 24-lead TSSOP.
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 registered trademarks are the property of their respective owners.
Fax: 781.461.3113 ©20042007 Analog Devices, Inc. All rights reserved.ESD Caution : 10 Pin Configuration and Function Descriptions : 11 RMS Noise and Resolution Specifications : 13
Chop Enabled : 13 Chop Disabled : 15 Typical Performance Characteristics : 16 On-Chip Registers : 17 Communications Register : 17 Status Register : 18 Mode Register : 19 Configuration Register : 22 Data Register 24 ID Register 24 IO Register : 24 Offset Register : 25
C to Rev. D Changes to Specifications Endnote : 7 Changes to Status Register Section : 18 Changes to Ordering Guide : 36
B to Rev. C Updated Format : Universal Added AD7794 C-Grade Part : Universal Changes to Specifications : 3 Changes to Ordering Guide : 36
0 to Rev. A Changes to Absolute Maximum Ratings : 9 Changes to Figure : 25 Changes to Data Output Coding Section : 28 Changes to Calibration Section : 30 Changes to Ordering Guide : 33
A to Rev. B Added AD7795 : Universal Changes to Features : 1 Changes to Table : 3 Changes to RMS Noise and Resolution Specifications Section : 12 Changes to Table : 20 Changes to ADC Circuit Information Section : 25 Changes to Ordering Guide : 35
SPECIFICATIONSAverage Input Current Average Input Current Drift Normal Mode Rejection2, 6 Internal Clock @ 50 Hz, 60 Hz External Clock @ 50 Hz, 60 Hz
fADC 242 Hz See the RMS Noise and Resolution Specifications section See the RMS Noise and Resolution Specifications section
Gain to 16, external reference Gain to 128, external reference AIN = 1 V/gain, gain 4, external reference
VREF = REFIN(+) - REFIN(-), or internal reference, gain to 128Gain or 2, update rate 100 Hz Gain to 128, update rate Hz AIN6(+)/AIN6(-) Gain or 2, update rate 100 Hz Gain to 128, update rate Hz AIN6(+)/AIN6(-)
Gain or 2 Input current varies with input voltage同じメーカーの部品番号
Japan からの 44 件のバイヤーレビュー
hirabayashi makoto
Length of registration:2 years
good!
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10/07/2021
Tsuyoshi Shimizu
Length of registration:2 years
satisfaction
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07/29/2021
Mitsunaga Saito
Length of registration:6 years
OK.best friend
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09/15/2020
Satoshi Shibuichi
Length of registration:3 years
Works fine!
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05/17/2020
tsutsui kenzi
Length of registration:7 years
Thank you.
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05/05/2020
Ito Kenji
Length of registration:8 years
Very satisfied with
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05/03/2020
Shoichi Wakaguri
Length of registration:7 years
Very Good Quality MASKS!
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04/18/2020
goro miyake
Length of registration:9 years
OK.
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12/14/2017
Kazumori Tanaka
Length of registration:11 years
They are very good goods. Thank you!!
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10/21/2016
Mitsuru Kawamoto
Length of registration:7 years
good job thanks!
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07/01/2016
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