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參數資料
型號: AD7794BRU
廠商: Analog Devices Inc
文件頁數: 1/37頁
文件大小: 0K
描述: IC ADC 24BIT 6CH LP 24-TSSOP
標準包裝: 62
位數: 24
采樣率(每秒): 470
數據接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉換器數目: 1
功率耗散(最大): 2.5mW
電壓電源: 模擬和數字
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 24-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 24-TSSOP
包裝: 管件
輸入數目和類型: 6 個差分,單極;6 個差分,雙極
配用: EVAL-AD7794EBZ-ND - BOARD EVALUATION FOR AD7794
6-Channel, Low Noise, Low Power, 24-/16-Bit
ADC with On-Chip In-Amp and Reference
AD7794/AD7795
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
2004–2007 Analog Devices, Inc. All rights reserved.
FEATURES
Up to 23 effective bits
RMS noise: 40 nV @ 4.17 Hz, 85 nV @ 16.7 Hz
Current: 400 μA typical
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
Independent interface power supply
24-lead TSSOP
3-wire serial interface
SPI, QSPI, MICROWIRE, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
Temperature measurement
Pressure measurement
Weigh scales
Strain gage transducers
Gas analysis
Industrial process control
Instrumentation
Blood analysis
Smart transmitters
Liquid/gas chromatography
6-digit DVM
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 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.
FUNCTIONAL BLOCK DIAGRAM
04854-
001
DOUT/RDY
DIN
SCLK
CS
DVDD
SERIAL
INTERFACE
AND
LOGIC
CONTROL
Σ-Δ
ADC
AD7794: 24-BIT ADC
AD7795: 16-BIT ADC
AD7794/AD7795
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
AIN3(+)
AIN3(–)
AIN5(+)/IOUT2
AIN5(–)/IOUT1
AIN6(+)/P1
AIN6(–)/P2
VDD
GND
MUX
VBIAS
PSW
GND
BAND GAP
REFERENCE
TEMP
SENSOR
CLK
INTERNAL
CLOCK
GND
REFERENCE
DETECT
GND
AVDD
AIN4(+)/REFIN2(+) REFIN1(+) AIN4(–)/REFIN2(–) REFIN1(–)
VDD
IN-AMP
BUF
Figure 1.
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參數描述
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AD7794BRUZ 功能描述:IC ADC 24BIT SIG-DEL 6CH 24TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率(每秒):1M 數據接口:串行,SPI? 轉換器數目:1 功率耗散(最大):- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤(4x4) 包裝:Digi-Reel® 輸入數目和類型:8 個單端,單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6
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