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| 型号： | AD5282BRUZ200 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC DUAL POT 200K 256POS 16-TSSOP |
| 标准包装： | 96 |
| 接片： | 256 |
| 电阻（欧姆）： | 200k |
| 电路数： | 2 |
| 温度系数： | 标准值 30 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | I²C（设备位址） |
| 电源电压： | 4.5 V ~ 16.5 V，±4.5 V ~ 5.5 V |
| 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： | 管件 |
| 产品目录页面： | 787 (CN2011-ZH PDF) |
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AD5280/AD5282
Rev. C | Page 22 of
28
PROGRAMMABLE CURRENT SOURCE
+5V
RS
102
V+
REF191
GND
AD5280
2
3
6
B
A
W
C1
1F
4
U1
0 TO (2.048 + VL)
VOUT
VIN
5V
RL
100
V–
OP8510
U2
VL
–2.048V TO VL
IL
SLEEP
OP8510
U2
02
92
9-
06
1
Figure 61. Programmable Current Source
A programmable current source can be implemented with the
headroom and high current handling precision reference that
can deliver 20 mA at 2.048 V. The load current is simply the
voltage across Terminal B to Terminal W of the digital
potentiometer divided by RS.
N
S
REF
L
R
D
V
I
2
×
=
(8)
The circuit is simple, but attention must be paid to two things.
First, dual-supply op amps are ideal because the ground
potential of REF191 can swing from 2.048 V at zero scale to VL
at full scale of the potentiometer setting. Although the circuit
works under single supply, the programmable resolution of the
system is reduced.
For applications that demand higher current capabilities, a
few changes to the circuit in Figure 61 produce an adjustable
current in the range of hundreds of milliamps. First, the voltage
reference needs to be replaced with a high current, low dropout
regulator, such as the ADP3333, and the op amp needs to be
swapped with a high current dual-supply model, such as the
AD8532. Depending on the desired range of current, an
appropriate value for RS must be calculated. Because of the high
current flowing to the load, the user must pay attention to the
load impedance so as not to drive the op amp beyond the
positive rail.
PROGRAMMABLE BIDIRECTIONAL CURRENT
SOURCE
AD5280
+5V
R1
150k
R2A
14.95k
|L
R2B
50k
R2I
15k
C1
10pF
R1I
150k
VL
RL
500k
A2
+15V
A
W
V+
OP2177
V–
V+
V–
A1
–5V
–15V
02
92
9-
0
62
Figure 62. Programmable Bidirectional Current Source
For applications that require bidirectional current control or
higher voltage compliance, a Howland current pump can be a
solution (see Figure 62). If the resistors are matched, the load
current is
(
)
W
B
A
V
R1
R2
L
R2
I
×
+
=
(9)
In theory, R2B can be made as small as needed to achieve the
current needed within the A2 output current driving capability.
In this circuit, the OP2177 can deliver ±5 mA in either direction,
and the voltage compliance approaches 15 V. It can be shown
that the output impedance is
(
)
()
B
A
B
O
R2
R1'
R2'
R1
R2
R1
R2
'
R1
Z
+
×
+
=
(10)
This output impedance can be infinite if Resistor R1' and
Resistor R2' match precisely with R1 and R2A + R2B,
respectively. On the other hand, it can be negative if the
resistors are not matched. As a result, C1 must be in the range
of 1 pF to 10 pF to prevent the oscillation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5282BRUZ2002 | 制造商:AD 制造商全称:Analog Devices 功能描述:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer |
| AD5282BRUZ200-R7 | 功能描述:IC POT DGTL 200K 256POS 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5282BRUZ200-R72 | 制造商:AD 制造商全称:Analog Devices 功能描述:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer |
| AD5282BRUZ202 | 制造商:AD 制造商全称:Analog Devices 功能描述:Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer |
| AD5282BRUZ20-REEL7 | 功能描述:IC POT DGTL 20K 256POS 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
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