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| 型号： | ADR425ARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/24页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 5V 8-SOIC |
| 设计资源： | Versatile High Precision Programmable Current Sources Using DACs, Op Amps, and MOSFET Transistors (CN0151) |
| 标准包装： | 1,000 |
| 系列： | XFET® |
| 基准类型： | 串联，精度 |
| 输出电压： | 5V |
| 容差： | ±0.12% |
| 温度系数： | 10ppm/°C |
| 输入电压： | 7 V ~ 18 V |
| 通道数： | 1 |
| 电流 - 静态： | 500µA |
| 电流 - 输出： | 10mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
ADR420/ADR421/ADR423/ADR425
PROGRAMMABLE CURRENT SOURCE
Together with a digital potentiometer and a Howland current
pump, the ADR425 forms the reference source for a program-
mable current as
Data Sheet
PROGRAMMABLE DAC REFERENCE VOLTAGE
With a multichannel DAC, such as the quad, 12-bit voltage
output AD7398 , one of its internal DACs, and an ADR42x
voltage reference can be used as a common programmable
? R2 A + R2 B ?
I L =
VW =
× V REF
V REF × ? 1 +
? R2 ?
V REF x =
(5)
? 1 + N ×
? D R2 ?
and
? ?
? R1 ?
D
2 N
R2 B
× V W
(3)
(4)
V REF x for the rest of the DACs. The circuit configuration is
shown in Figure 47. The relationship of V REF x to V REF depends
on the digital code and the ratio of R1 and R , and is given by
?
? R1 ?
?
? 2 R1 ?
where:
D is the decimal equivalent of the input code.
N is the number of bits.
where:
D is the decimal equivalent of input code.
N is the number of bits.
V DD
2
V IN
TRIM 5
R1'
50k ?
C1
10pF
R2'
1k ?
V DD
V REF is the applied external reference.
V REF x is the reference voltage for DACs A to D.
Table 9. V REF x vs. R1 and R2
R1, R2 Digital Code V REF
V OUT 6
U1
ADR425
GND
4
AD5232
U2
DIGITAL POT
A
U2
B W
V DD
V+
A1
OP2177
V–
C2
10pF
R1
50k ?
V+
A2
OP2177
V–
V SS
R2 A
1k ?
R2 B
10 ?
R1 = R2
R1 = R2
R1 = R2
R1 = 3R2
R1 = 3R2
R1 = 3R2
0000 0000 0000
1000 0000 0000
1111 1111 1111
0000 0000 0000
1000 0000 0000
1111 1111 1111
2 V REF
1.3 V REF
V REF
4 V REF
1.6 V REF
V REF
V SS
VL
LOAD
IL
Figure 46. Programmable Current Source
R2
R1' and R2' must be equal to R1 and R2 A + R2 B , respectively.
V REF A
V OUT A
R1
±0.1%
±0.1%
Theoretically, R2 B can be made as small as needed to achieve
the current needed within A2 output current driving capability.
DACA
V IN
V REF
ADR425
In the example shown in Figure 46, OP2177 is able to deliver
a maximum of 10 mA. Because the current pump uses both
positive and negative feedback, capacitors C1 and C2 are needed
V REF B
DACB
V OUT B
V OB = V REF x (D B )
to ensure that negative feedback prevails and, therefore, avoiding
oscillation. This circuit also allows bidirectional current flow if
the inputs V A and V B of the digital potentiometer are supplied
V REF C
DACC
V OUT C
V OC = V REF x (D C )
with the dual-polarity references as previously shown.
V REF D
V OUT D
V OD = V REF x (D D )
DACD
AD7398
Figure 47. Programmable DAC Reference
Rev. J | Page 20 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADR425BR | 功能描述:IC VREF SERIES PREC 5V 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:XFET® 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:5V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:80µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°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:带卷 (TR) 其它名称:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND |
| ADR425BR-REEL7 | 功能描述:IC VREF SERIES PREC 5V 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:XFET® 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:5V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:80µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°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:带卷 (TR) 其它名称:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND |
| ADR425BRZ | 功能描述:IC VREF SERIES PREC 5V 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:XFET® 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:3V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:82µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-TSSOP（5 引线），SC-88A，SOT-353 供应商设备封装:SC-70-5 包装:带卷 (TR) 其它名称:296-20888-2 |
| ADR425BRZ | 制造商:Analog Devices 功能描述:IC V REF SERIES 5V +/-0.002V 8SO |
| ADR425BRZ-REEL7 | 功能描述:IC VREF SERIES PREC 5V 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:XFET® 标准包装:2,000 系列:- 基准类型:旁路，可调节，精度 输出电压:1.24 V ~ 16 V 容差:±0.5% 温度系数:- 输入电压:1.24 V ~ 16 V 通道数:1 电流 - 阴极:100µA 电流 - 静态:- 电流 - 输出:20mA 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:TO-226-3、TO-92-3（TO-226AA）成形引线 供应商设备封装:TO-92-3 包装:带卷 (TR) |
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