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参数资料
| 型号： | AD5555CRUZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/24页 |
| 文件大小： | 0K |
| 描述： | IC DAC 14BIT DUAL 3WIRE 16-TSSOP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1,000 |
| 设置时间： | 500ns |
| 位数： | 14 |
| 数据接口： | 串行 |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 55µW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 2 电流，单极；2 电流，双极 |
| 采样率（每秒）： | 2M |
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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