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參數(shù)資料
| 型號(hào)： | AD7669JP |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O PORT 8BIT ANLG 28-PLCC |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | LC²MOS |
| 應(yīng)用： | 模擬 I/O |
| 接口： | 總線 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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 VIN is sampled and
held infinitely at VOUT until the next tare cycle. VOUT 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7669JP-REEL | 制造商:Analog Devices 功能描述:Data Acquisition System Single ADC Dual DAC 8-Bit 28-Pin PLCC T/R 制造商:Rochester Electronics LLC 功能描述:COMPLETE 8-BIT I/0 SYSTEM - Tape and Reel |
| AD7669JPZ | 功能描述:IC I/O PORT 8BIT ANLG 28-PLCC RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:LC²MOS 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)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(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| AD7669JR | 制造商:Analog Devices 功能描述:Data Acquisition System Single ADC Dual DAC 8-Bit 28-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:COMPLETE 8-BIT 1/O SYSTEM - Bulk |
| 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(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)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(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
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