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| 型号： | ADR02ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 5V 8-SOIC |
| 设计资源： | High Accuracy, Bipolar Voltage Output Digital-to-Analog Conversion Using AD5764 (CN0006) 4 mA to 20 mA Process Control Loop Using AD5662 (CN0009) 16-Bit Fully Isolated Voltage Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0063) 16-Bit Fully Isolated 4 mA to 20 mA Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0064) |
| 标准包装： | 98 |
| 基准类型： | 串联，精度 |
| 输出电压： | 5V |
| 容差： | ±0.1% |
| 温度系数： | 10ppm/°C |
| 输入电压： | 7 V ~ 36 V |
| 通道数： | 1 |
| 电流 - 静态： | 1mA |
| 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： | 管件 |
| 产品目录页面： | 795 (CN2011-ZH PDF) |
Data Sheet
ADR01/ADR02/ADR03/ADR06
? R1 ′ R2
? R1R2 ′
? 1 ?
PROGRAMMABLE 4 mA TO 20 mA CURRENT
TRANSMITTER
Because of their precision, adequate current handling, and small
Z O =
V t
I t
=
?
R1 ′
?
?
(3)
(R2 + R3) R1 V REF × D
I L = × (2)
footprint, the devices are suitable as the reference sources for
many high performance converter circuits. One of these
applications is the multichannel 16-bit, 4 mA to 20 mA current
This circuit employs a Howland current pump at the output to
yield better efficiency, a lower component count, and a higher
voltage compliance than the conventional design with op amps
and MOSFETs. In this circuit, if the resistors are matched such
that R1 = R1 ′ , R2 = R2 ′ , R3 = R3 ′ , the load current is
R3 ′ 2 N
where D is similarly the decimal equivalent of the DAC input
code and N is the number of bits of the DAC.
In this circuit, an ADR01 provides the stable 10.000 V reference
for the AD5544 quad 16-bit DAC. The resolution of the adjust-
able current is 0.3 μA/step; the total worst-case INL error is
merely 4 LSBs. Such error is equivalent to 1.2 μA or a 0.006%
system error, which is well below most systems’ requirements.
The result is shown in Figure 41 with measurement taken at 25°C
and 70°C; total system error of 4 LSBs at both 25°C and 70°C.
5
R L = 500?
I L = 0mA TO 20mA
4
3
2
According to Equation 2, R3 ′ can be used to set the sensitivity.
R3 ′ can be made as small as necessary to achieve the current
needed within U4 output current driving capability. Alter-
natively, other resistors can be kept high to conserve power.
1
0
70°C
25°C
In this circuit, the AD8512 is capable of delivering 20 mA of
current, and the voltage compliance approaches 15.0 V.
–1
0
8192
16384
24576
32768
40960
49152 57344 65536
0V TO –10V
CODE (Decimal)
U2
V DD
15V
10V V REF AD5544
V X
–15V
R1'
5V
U1 RF
IO
V IN V OUT
IO
GND
TEMP TRIM
GND
DIGITAL INPUT
CODE 20%–100% FULL SCALE
U1 = ADR01/ADR02/ADR03/ADR06, REF01
U2 = AD5543/AD5544/AD5554
U3, U4 = AD8512
+15V
U3
AD8512 U4
150k? LOAD
VP
VN
R1 R2
150k? 15k?
C1
10pF
R2'
15k?
500?
R3
50?
V O
R3'
50?
V L
Figure 41. Result of Programmable 4 mA to 20 mA Current Transmitter
PRECISION BOOSTED OUTPUT REGULATOR
A precision voltage output with boosted current capability can
be realized with the circuit shown in Figure 42. In this circuit,
U2 forces V O to be equal to V REF by regulating the turn-on of
N1, thereby making the load current furnished by V IN . In this
configuration, a 50 mA load is achievable at V IN of 15.0 V.
Moderate heat is generated on the MOSFET, and higher current
can be achieved with a replacement of a larger device. In
addition, for a heavy capacitive load with a fast edging input
signal, a buffer should be added at the output to enhance the
transient response.
4mA TO 20mA
N1
C 1
Figure 40. Programmable 4 mA to 20 mA Transmitter
The Howland current pump yields a potentially infinite output
impedance, that is highly desirable, but resistance matching is
critical in this application. The output impedance can be deter-
mined using Equation 3. As shown by this equation, if the
resistors are perfectly matched, Z O is infinite. Alternatively, if
they are not matched, Z O is either positive or negative. If the
V IN
U1
ADR01/
ADR02/
ADR03/
ADR06
V IN V OUT
TEMP TRIM
GND
2N7002
15V
R 1
100?
V+
OP1177
V–
U2
R L
200?
R 2
100?
C L
1μF
V O
latter is true, oscillation can occur. For this reason, connect
Capacitor C1 in the range of 1 pF to 10 pF between VP and the
output terminal of U4 to filter any oscillation.
Rev. R | Page 17 of 20
1000pF
Figure 42. Precision Boosted Output Regulator
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADR02ARZ | 制造商:Analog Devices 功能描述:IC SERIES V-REF 5V 5mV 8-SOIC |
| ADR02ARZ2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultracompact Precision10 V/5 V/2.5 V/3.0 V Voltage References |
| ADR02ARZ-REEL | 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:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°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-SOIC 包装:管件 |
| ADR02ARZ-REEL2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultracompact Precision10 V/5 V/2.5 V/3.0 V Voltage References |
| ADR02ARZ-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:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°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-SOIC 包装:管件 |
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