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| 型号： | EVAL-AD5545SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5545 |
| 标准包装： | 1 |
| 系列： | * |
Data Sheet
AD5545/AD5555
Rev. G | Page 13 of 24
PROGRAMMABLE CURRENT SOURCE
Figure 24 shows a versatile V-to-I conversion circuit using
improved Howland Current Pump. In addition to the precision
current conversion it provides, this circuit enables a bidirec-
tional current flow and high voltage compliance. This circuit
can be used in a 4 mA to 20 mA current transmitter with up to
a 500 of load. In Figure 24, it shows that if the resistor
network is matched, the load current is
(
)
D
V
R3
R1
R3
R2
I
REF
L
×
+
=
(5)
R3, in theory, can be made small to achieve the current needed
within the U3 output current driving capability. This circuit is
versatile such that the AD8510 can deliver ±20 mA in both
directions, and the voltage compliance approaches 15 V, which
is mainly limited by the supply voltages of U3. However, users
must pay attention to the compensation. Without C1, it can be
shown that the output impedance becomes
(
)
(
)
(
)
R3
R2
1
R
3
R
2
R
R1
R2
R1
R3
1
R
ZO
+
′
+
′
+
′
=
–
(6)
If the resistors are perfectly matched, ZO is infinite, which is
desirable, and the resistors behave as an ideal current source.
On the other hand, if they are not matched, ZO can be either
positive or negative. The latter can cause oscillation. As a result,
C1 is needed to prevent the oscillation. For critical applications,
C1 could be found empirically but typically falls in the range of
a few picofarads.
AD5545/AD5555
AD8628
AD8510
VREF
IOUT
VDD
C1
10pF
VSS
LOAD
GND
02918- 0- 023
VL
IL
RFB
U2
U3
U1
V+
V–
R3'
50
R1'
150k
R2'
15k
R1
150k
R2
15k
R3
50
Figure 24. Programmable Current Source with Bidirectional
Current Control and High Voltage Compliance Capabilities
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| EVAL-AD5546SDZ | 功能描述:BOARD EVAL FOR AD5546 RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率（每秒）:- 数据接口:串行，SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| EVAL-AD5551/52EB | 制造商:Analog Devices 功能描述:EVAL KIT FOR AD5551 5 V, SERL-INPUT VOLT-OUTPUT, 14BIT DACS - Bulk |
| EVAL-AD5560EBUZ | 功能描述:BOARD EVALUATION FOR AD5560 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| EVAL-AD5570EB | 制造商:Analog Devices 功能描述:DEV TOOLS, TRUE ACCURACY, 16BIT 12V/ 15V, SERL INPUT VOLT O - Bulk |
| EVAL-AD5570EBZ | 功能描述:BOARD EVALUATION FOR AD5570 RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率（每秒）:- 数据接口:串行，SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
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