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參數(shù)資料
| 型號： | ADR370BRT-REEL7 |
| 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)： | 8/12頁 |
| 文件大小： | 182K |
| 代理商： | ADR370BRT-REEL7 |
REV. A
–8–
ADR370
12-Bit Precision Programmable Current Source
By replacing the potentiometer in Figure 6 with a 12-bit precision
DAC like the AD5322, a higher precision programmable current
source can be achieved. Figure 7 illustrates the implementation
of this circuit. The load current can be determined with the
following equation.
(
×
4096
The compliance voltage should be kept low so that the supply
voltage to U2, between V
DD
and GND, does not fall below 2.5 V.
I
V
R
D
L
REF
SET
=
)
1
(6)
V
IN
U1
U2
+5V
V+
V–
1
11
U3
2
3
VREF (1 – D2/N)
+5V
OP1177
AD5322
–5V
ADR370
V
OUT
GND
+5V
V
L
R
L
R
SET
TOL
±
0.05%
I
L
V
IN
V
DD
V
O
GND
Figure 7. 12-Bit Programmable Current Source
Precision Boosted Output Regulator
A precision voltage output with boosted current can be realized
with the circuit shown in Figure 8. In this circuit, V
O
is maintained
by the ADR370 at 2.048 V.
The ADR370 sources a maximum of 5 mA if the load current,
I
L
, is more than 5 mA, current is furnished by the transistor, Q1,
and the input voltage supply V
DD
.
V
IN
R1
10k
R
L
I
L
ADR370
V
OUT
GND
V
DD
Q1
2N3906
4V TO 12V
Figure 8. Precision Boosted Output Regulator
Q1 will be turned on to regulate current as needed. R1 is required
to bias the base of Q1 and must be large enough to comply with
the supply current requirements of the ADR370. The supply
voltage can be as low as 4 V.
The maximum current output of this circuit is limited by the
power dissipation of the bipolar transistor, Q1.
(
2 048
.
P
V
I
DISS
DD
L
=
)
×
(7)
Using the 2N3906 PNP transistor shown in Figure 8 and a 4 V
power supply, R
L
should be chosen so that a maximum of 100 mA
is drawn from the circuit, which limits the power dissipation of
Q1 to ~200 mW.
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| ADR380 | Precision Low-Drift 2.048 V/2.500 V SOT-23 Voltage References |
| ADR380ART-R2 | Precision Low-Drift 2.048 V/2.500 V SOT-23 Voltage References |
| ADR380ARTZ-REEL7 | Precision Low-Drift 2.048 V/2.500 V SOT-23 Voltage References |
| ADR381ART-R2 | Precision Low-Drift 2.048 V/2.500 V SOT-23 Voltage References |
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相關代理商/技術參數(shù) |
參數(shù)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 |
| ADR380ART-R2 | 制造商:Analog Devices 功能描述:V-Ref Precision 2.048V 5mA 3-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:2.048 VOLTAGE REFERENCE - Bulk 制造商:Analog Devices 功能描述:IC VOLT REF |
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