参数资料
| 型号： | AD5231BRU50 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 1024POS 16-TSSOP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 96 |
| 接片： | 1024 |
| 电阻（欧姆）： | 50k |
| 电路数： | 1 |
| 温度系数： | 标准值 600 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | 4 线 SPI（芯片选择） |
| 电源电压： | 2.7 V ~ 5.5 V，±2.25 V ~ 2.75 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 |
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Data Sheet
AD5231
Rev. D | Page 25 of 28
PROGRAMMABLE BIDIRECTIONAL CURRENT
SOURCE
For applications that require bidirectional current control or
higher voltage compliance, a Howland current pump can be a
solution. If the resistors are matched, the load current is
(
)
W
L
V
R2B
R1
R2B
R2A
I
×
+
=
(8)
–15V
OP2177
V+
V–
+15V
+
–
C1
10pF
R2
15k
R1
150k
RL
500
R2B
50
VL
R1
150k
R2A
14.95k
IL
OP2177
V+
V–
+15V
+
–
–15V
A1
AD5231
A
B W
+2.5V
–2.5V
A2
02739-
052
Figure 53. Programmable Bidirectional Current Source
R2B, in theory, can be made as small as necessary to achieve the
current needed within the A2 output current-driving capability.
In this circuit, OP2177 delivers ±5 mA in both directions, and
the voltage compliance approaches 15 V. It can be shown that
the output impedance is
)
(
)
(
R2B
R2A
R1'
R1R2'
R2A
R1
R2B
R1'
ZO
+
+
=
(9)
ZO can be infinite if resistors R1 and R2 match precisely with R1
and R2A + R2B,respectively. On the other hand, ZO can be
negative if the resistors are not matched. As a result, C1, in the
range of 1 pF to 10 pF, is needed to prevent oscillation from the
negative impedance.
RESISTANCE SCALING
The AD5231 offers 10 k, 50 k, and 100 k nominal
resistance. For users who need lower resistance but want to
maintain the number of adjustment steps, they can parallel
multiple devices. For example, Figure 54 shows a simple scheme
of paralleling two AD5231s. To adjust half the resistance
linearly per step, users need to program both devices coherently
with the same settings and tie the terminals as shown.
A1
B1
W1
W2
A2
B2
LD
02739-
053
Figure 54. Reduce Resistance by Half with Linear Adjustment Characteristics
In voltage diver mode, by paralleling a discrete resistor as
shown in Figure 55, a proportionately lower voltage appears at
Terminals A–B. This translates into a finer degree of precision,
because the step size at Terminal W is smaller. The voltage can
be found as follows:
DD
AB
W
V
D
R2
R
R3
)
R2
R
D
V
×
+
=
1024
//
(
)
(
(10)
R1
R2
A
B
W
R3
02739-
059
Figure 55. Lowering the Nominal Resistance
Figure 54 and Figure 55 show that the digital potentiometers
change steps linearly. On the other hand, pseudo log taper
adjustment is usually preferred in applications such as audio
control. Figure 56 shows another type of resistance scaling. In
this configuration, the smaller the R2 with respect to R1, the
more the pseudo log taper characteristic of the circuit behaves.
R1
R2
VO
A
B
W
02739-
055
Figure 56. Resistor Scaling with Pseudo Log Adjustment Characteristics
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5231BRU50-REEL7 | 功能描述:IC DGTL POT 1024POS 16-TSSOP TR RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:2,500 系列:XDCP™ 接片:256 电阻（欧姆）:100k 电路数:1 温度系数:标准值 ±300 ppm/°C 存储器类型:非易失 接口:I²C（设备位址） 电源电压:2.7 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) |
| AD5231BRUZ10 | 功能描述:IC POT DGTL 1024POS 16-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 接片:256 电阻（欧姆）:100k 电路数:1 温度系数:标准值 35 ppm/°C 存储器类型:非易失 接口:3 线串口 电源电压:2.7 V ~ 5.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN-EP（3x3） 包装:剪切带 (CT) 产品目录页面:1399 (CN2011-ZH PDF) 其它名称:MAX5423ETA+TCT |
| AD5231BRUZ10 | 制造商:Analog Devices 功能描述:Digital Potentiometer (Pots) IC |
| AD5231BRUZ100 | 功能描述:IC DGTL POT 100K SPI 16-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 接片:256 电阻（欧姆）:100k 电路数:1 温度系数:标准值 35 ppm/°C 存储器类型:非易失 接口:3 线串口 电源电压:2.7 V ~ 5.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN-EP（3x3） 包装:剪切带 (CT) 产品目录页面:1399 (CN2011-ZH PDF) 其它名称:MAX5423ETA+TCT |
| AD5231BRUZ100-RL7 | 功能描述:IC DGTL POT 100K 16-TSSOP 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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