参数资料
| 型号： | ADR370BRT-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC SOT-23-3 |
| 标准包装： | 1 |
| 基准类型： | 串联，精度 |
| 输出电压： | 2.048V |
| 容差： | ±0.2% |
| 温度系数： | 50ppm/°C |
| 输入电压： | 2.3 V ~ 15 V |
| 通道数： | 1 |
| 电流 - 静态： | 72µA |
| 电流 - 输出： | 5mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 剪切带 (CT) |
| 其它名称： | ADR370BRT-R2CT |
ADR370
12-BIT PRECISION PROGRAMMABLE CURRENT
SOURCE
By replacing the potentiometer in Figure 17 with a 12-bit
precision DAC, such as the AD5322 , a higher precision
illustrates the implementation of this circuit. The load current
can be determined with the following equation:
PRECISION BOOSTED OUTPUT REGULATOR
A precision voltage output with boosted current can be realized
with the circuit shown in Figure 19. In this circuit, V OUT 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 and if the current is furnished by the
transistor (Q1) and the input voltage supply (V DD ).
I L =
V REF ( 1 ? D )
R SET × 4096
(6)
V DD
R1
4V TO 12V
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.
10k ?
Q1
2N3906
U1
+5V
ADR370
ADR370
V IN
V OUT
V IN
V OUT
GND
U2
V REF
VREF (1 – D2/N)
AD5322
GND
R L
I L
+5V
V DD
V OUT
R SET
GND
+5V
U3
2
TOL ±0.05%
Figure 19. Precision Boosted Output Regulator
1
OP1177
V+
V–
11
–5V
3
R L
I L
V L
Q1 is 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
Figure 18. 12-Bit Programmable Current Source
power dissipation of the bipolar transistor, Q1.
P DISS = ( V DD ? 2.048) × I L
(7)
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.
Rev. C | Page 10 of 12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:1 系列:- 基准类型:串联，精度 输出电压:4.5V 容差:±800µV 温度系数:1ppm/°C 输入电压:13.5 V ~ 22 V 通道数:1 电流 - 阴极:- 电流 - 静态:7mA 电流 - 输出:10mA 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:20-LCC 供应商设备封装:20-CLCC 包装:管件 |
| ADR380 | 制造商:AD 制造商全称: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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