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參數資料
型號: AD7669JR
廠商: ANALOG DEVICES INC
元件分類: 模擬信號調理
英文描述: LC2MOS Complete, 8-Bit Analog I/0 Systems
中文描述: SPECIALTY ANALOG CIRCUIT, PDSO24
封裝: SOIC-24
文件頁數: 19/20頁
文件大小: 504K
代理商: AD7669JR
AD7569/AD7669
–19–
REV. B
TARE FUNCTION FOR WEIGH SCALE—AD7569
The infinite sample-and-hold just outlined can also form the ba-
sis of a circuit to provide a tare function for a weigh scale sys-
tem. Figure 30 shows a circuit for a weigh scale system. It
incorporates a tare function using a simple circuit based on the
AD7569.
The AD587, along with the 2N6285, provides a buffered +10 V
reference to supply the low impedance load cell transducer. The
load cell output is amplified by the AD624 precision instrumen-
tation amplifier with gain adjustment provided by R1. The out-
put of the AD624 is applied to the noninverting input of a unity
gain differential summing amplifier that uses the AD707, a high
precision op amp with low drift. The AD707 feeds a 3 1/2 digit
panel meter module that converts the signal for digital readout.
The input signal to the panel meter is also applied to the analog
input of the AD7569 for the tare function. When the tare switch
(S1) is closed, a tare cycle commences and V
IN
is sampled and
held infinitely at V
OUT
until the next tare cycle. V
OUT
drives the
inverting input of the differential amplifier and forces its output
to zero. Thus, the tare function is used to give a readout of zero
for any undesired weight, such as a box, when only the item
placed in it is to be weighed. The tare function can also be used
in calibrating the system, to cancel out offset errors due to the
load cell, AD624 and differential amplifier.
The AD7569 offers many advantages in the system outlined,
such as: simple, low cost circuit—no need for microprocessor,
software, etc.—and low power consumption.
Figure 30. Weigh Scale System with Tare Function
相關PDF資料
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相關代理商/技術參數
參數描述
AD7669JR-REEL 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel
AD7669JRZ 功能描述:IC I/O PORT 8BIT ANLG 28SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:LC²MOS 特色產品:NXP - I2C Interface 標準包裝:1 系列:- 應用:2 通道 I²C 多路復用器 接口:I²C,SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP(0.173",4.40mm 寬) 供應商設備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1
AD7669JRZ-REEL 功能描述:IC I/O PORT 8BIT ANLG 28SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:LC²MOS 特色產品:NXP - I2C Interface 標準包裝:1 系列:- 應用:2 通道 I²C 多路復用器 接口:I²C,SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP(0.173",4.40mm 寬) 供應商設備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1
AD766AN 功能描述:IC DAC 16BIT W/REF DSP 16-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:DACPORT® 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數:16 數據接口:并聯 轉換器數目:1 電壓電源:雙 ± 功率耗散(最大):100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC(J 形引線) 供應商設備封裝:28-PLCC(11.51x11.51) 包裝:帶卷 (TR) 輸出數目和類型:1 電壓,單極;1 電壓,雙極 采樣率(每秒):143k
AD766ANZ 功能描述:IC DAC 16BIT W/REF DSP 16-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:DACPORT® 標準包裝:1 系列:- 設置時間:4.5µs 位數:12 數據接口:串行,SPI? 轉換器數目:1 電壓電源:單電源 功率耗散(最大):- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC(0.154",3.90mm 寬) 供應商設備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數目和類型:1 電壓,單極;1 電壓,雙極 采樣率(每秒):* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND
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