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參數(shù)資料
| 型號： | ADR370BRT-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Precision Low Power 2.048 V SOT-23 Voltage Reference |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.048 V, PDSO3 |
| 封裝： | TO-236AB, SOT-23-3 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 182K |
| 代理商： | ADR370BRT-R2 |
REV. A
ADR370
–7–
APPLICATIONS
Low Cost Negative Reference
A low cost negative reference can be obtained by leveraging the
current sinking capability of the ADR370. Simply tying the V
OUT
terminal to ground and adding a bias resistor, R
SET
, to the GND
pin of the device, a negative voltage reference can be obtained
as shown in Figure 3. R
SET
should be chosen such that I
SET
remains between 1 mA to 5 mA.
V
IN
V
DD
V
SS
R
SET
I
SET
ADR370
V
OUT
GND
–VREF
Figure 3. Low Cost Negative Reference
Precision Negative Reference
Without using any matching resistors, a precision negative reference
can be obtained using the configuration shown in Figure 4. The
voltage difference between V
OUT
and GND of the ADR370 is
2.048 V. Since V
OUT
is at virtual ground, U2 will close the loop by
forcing the GND pin to be the negative reference node. U2 should
be a low offset voltage precision op amp, such as the OP1177.
V
IN
+15V
U2
U1
2.3V TO 12V
OP1177
–15V
ADR370
V
OUT
GND
–VREF
Figure 4. Precision Negative Reference
Low Cost Current Source
Figure 5 illustrates how a simple, low cost current source can be
configured using the ADR370. The load current, I
L
, is simply
the sum of I
SET
and the quiescent current, I
q
. I
SET
is simply the
reference voltage generated by the ADR370 divided by R
SET
.
V
R
SET
The quiescent current, I
q
, varies slightly with load. The variation
in I
q
limits the use of this circuit to general-purpose applications.
I
SET
=
2 048
.
(4)
V
IN
V
L
+ 2.5V < V
DD
< V
L
+ 12V
ADR370
V
OUT
GND
I
SET
=
R
SET
R
SET
V
L
R
L
I
L
I
q
= 65 A
2.048V
Figure 5. Low Cost Current Source
Precision Current Source with Adjustable Output
A precision current source can be implemented with the circuit
shown in Figure 6. By adding a mechanical or digital potenti-
ometer, this circuit becomes an adjustable current source. If a
digital potentiometer like the AD5201 is used, the load current
is simply the voltage across terminals B-to-W of the digital
potentiometer divided by R
SET
.
V
D
R
SET
×
256
where
D
is the decimal equivalent of the digital potentiometer
input code.
I
L
REF
=
×
(5)
V
IN
+12V
A
B
W
–2.048V TO V
L
0V TO (2.048V + V
L
)
12V
OP1177
AD5201
–12V
ADR370
V
OUT
GND
V
L
R
L
R
SET
I
L
Figure 6. Programmable 0 mA to 5 mA Current Source
To optimize the resolution of this circuit, dual supply op amps
should be used because the ground potential of ADR370 can
swing from
–
2.048 V at zero scale to V
L
at full scale of the
potentiometer setting.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADR370BRT-REEL7 | 制造商:Rochester Electronics LLC 功能描述:+4.096V REFERENCE - Tape and Reel 制造商:Analog Devices 功能描述: |
| ADR370BRTZ-REEL | 制造商:Rochester Electronics LLC 功能描述: |
| ADR370BRTZ-REEL7 | 功能描述:IC VREF SERIES PREC SOT-23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 標準包裝:1 系列:- 基準類型:串聯(lián)，精度 輸出電壓:4.5V 容差:±800µV 溫度系數(shù):1ppm/°C 輸入電壓:13.5 V ~ 22 V 通道數(shù):1 電流 - 陰極:- 電流 - 靜態(tài):7mA 電流 - 輸出:10mA 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:20-LCC 供應商設備封裝:20-CLCC 包裝:管件 |
| ADR380 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Low-Drift 2.048 V/2.500 V SOT-23 Voltage References |
| ADR380ART | 制造商:Analog Devices 功能描述:Voltage Reference, Fixed, 2.048V, 3 Pin, Plastic, TO-236 |
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