參數(shù)資料
型號(hào)： REF194GSZ-REEL7
廠商： ANALOG DEVICES INC
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Precision Micropower, Low Dropout Voltage References
中文描述： 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 4.5 V, PDSO8
封裝： ROHS COMPLIANT, MS-012AA, SOIC-8
文件頁數(shù)： 24/28頁
文件大?。?/td> 407K
代理商： REF194GSZ-REEL7
REF19x Series
For V
S
levels lower than the lower threshold, U3 output is low;
thus, U2 and Q1 are off while U1 is on. For V
S
levels higher
than the upper threshold, the situation reverses, with U1 off and
both U2 and Q1 on. In the interest of battery power
conservation, all of the comparison switching circuitry is
powered from V
S
and is arranged so that when V
S
fails, the
default output comes from U1.
For the R1 to R3 values, as shown in Figure 30, lower/upper V
S
switching thresholds are approximately 5.5 V and 6 V respectively.
These can be changed to suit other V
S
supplies, as can the REF19x
devices used for U1 and U2, over a range of 2.5 V to5 V of output.
U3 can operate down to a V
S
of 3.3 V, which is generally
compatible with all REF19x family devices.
LOW POWER, STRAIN GAGE CIRCUIT
As shown in Figure 31, the REF19x family of references can be
used in conjunction with low supply voltage operational amplifiers,
such as the OP492 or the OP283, in a self-contained strain gage
circuit in which the REF195 is used as the core. Other
references can be easily accommodated by changing circuit
element values. The references play a dual role, first as the
voltage regulator to provide the supply voltage requirements of
the strain gage and the operational amplifiers, and second as
a precision voltage reference for the current source used to
stimulate the bridge. A distinct feature of the circuit is that it
can be remotely controlled on or off by digital means via
the SLEEP pin.
Rev. I | Page 24 of 28
500
0.1%
57k
1%
0.1μF
10k
1%
0.1μF
1/4
OP492
–
11
10μF
REF195
2.21k
20k
1%
10k
1%
20k
1%
20k
1%
20k
1%
0.01μF
10μF
100
OUTPUT
2N2222
+
1μF
+
6
2
4
+
1
4
2
3
1/4
OP492
+
–
7
5
6
1/4
OP492
+
10k
–
14
12
13
1/4
OP492
+
–
8
10
9
1%
0
Figure 31. A Low Power, Strain Gage Circuit
相關(guān)PDF資料
PDF描述
REF195ES-REEL Precision Micropower, Low Dropout Voltage References
REF195ESZ Precision Micropower, Low Dropout Voltage References
REF195ESZ-REEL Precision Micropower, Low Dropout Voltage References
REF195FS-REEL Precision Micropower, Low Dropout Voltage References
REF195FSZ Precision Micropower, Low Dropout Voltage References
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
REF195 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Micropower, Low Dropout, Voltage References
REF1950008S 制造商:Analog Devices 功能描述:
REF1950009S 制造商:Analog Devices 功能描述:
REF1950010BR 制造商:Rochester Electronics LLC 功能描述:- Bulk
REF1950013SR 制造商:Analog Devices 功能描述:
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