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參數(shù)資料
| 型號： | AD7569TQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, CDIP24 |
| 封裝： | CERDIP-24 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 504K |
| 代理商： | AD7569TQ |
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 |
PDF描述 |
|---|---|
| AD7669AR | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| AD7569 | Complete, 8-Bit Analog I/0 Systems(完備的8位模擬I/O系統(tǒng)) |
| AD7669 | Complete, 8-Bit Analog I/0 Systems(完備的8位模擬I/O系統(tǒng)) |
| AD7569AQ | LC2MOS Complete, 8-Bit Analog I/0 Systems |
| AD7569BN | LC2MOS Complete, 8-Bit Analog I/0 Systems |
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