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参数资料
| 型号： | AD5247EVAL |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 数字电位计 |
| 英文描述： | 128-Position I2C Compatible Digital Potentiometer |
| 中文描述： | 128位置I2C兼容数字电位器 |
| 文件页数： | 16/20页 |
| 文件大小： | 1181K |
| 代理商： | AD5247EVAL |
AD5247
LAYOUT AND POWER SUPPLY BYPASSING
It is a good practice to employ a compact, minimum lead-length
layout design. The leads to the inputs should be as direct as
possible with a minimum conductor length. Ground paths
should have low resistance and low inductance.
Similarly, it is a good practice to bypass the power supplies with
quality capacitors for optimum stability. Supply leads to the
device should be bypassed with 0.01 μF to 0.1 μF disc or chip
ceramic capacitors. Low ESR 1 μF to 10 μF tantalum or electro-
lytic capacitors should also be applied at the supplies to
minimize any transient disturbance and low frequency ripple
(see
). Note that the digital ground should also be
joined remotely to the analog ground at one point to minimize
the ground bounce.
Figure 40
Figure 40. Power Supply Bypassing
AD5247
V
DD
C1
C3
GND
10
μ
F
0.1
μ
F
+
V
DD
0
CONSTANT BIAS TO RETAIN RESISTANCE SETTING
For users who desire nonvolatility but cannot justify the
additional cost for the EEMEM, the AD5247 may be considered
as a low cost alternative by maintaining a constant bias to retain
the wiper setting. The AD5247 was designed specifically with
low power in mind, which allows low power consumption even
in battery-operated systems. The graph in
demonstrates the power consumption from a 3.4 V 450 mAhr
Li-ion cell phone battery, which is connected to the AD5247.
The measurement over time shows that the device draws
approximately 1.3 μA and consumes negligible power. Over a
course of 30 days, the battery was depleted by less than 2%, the
majority of which is due to the intrinsic leakage current of the
battery itself.
Figure 41
Figure 41. Battery Operating Life Depletion
DAYS
B
0
90%
92%
94%
96%
5
10
15
98%
100%
102%
104%
106%
108%
110%
20
25
30
0
T
A
= 25
°C
This demonstrates that constantly biasing the pot is not an
impractical approach. Most portable devices do not require the
removal of batteries for the purpose of charging. Although the
resistance setting of the AD5247 will be lost when the battery
needs replacement, such events occur rather infrequently such
that this inconvenience is justified by the lower cost and smaller
size offered by the AD5247. If and when total power is lost, the
user should be provided with a means to adjust the setting
accordingly.
EVALUATION BOARD
An evaluation board, along with all necessary software, is
available to program the AD5247 from any PC running
Windows 98, Windows 2000, or Windows XP. The graphical
user interface, as shown in
easy to use. More detailed information is available in the user
manual, which comes with the board.
, is straightforward and
Figure 42
Figure 42. AD5247 Evaluation Board Software
0
Rev. 0 | Page 16 of 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5248BRM10 | 功能描述:IC DGTL POT DUAL 10K I2C 10-MSOP RoHS:否 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) |
| AD5248BRM100 | 功能描述:IC DGTL POT DUAL 100K I2C 10MSOP RoHS:否 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) |
| AD5248BRM100-RL7 | 功能描述:IC DGTL POT DUAL 100K I2C 10MSOP RoHS:否 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) |
| AD5248BRM10-RL7 | 功能描述:IC DGTL POT DUAL 10K I2C 10-MSOP RoHS:否 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) |
| AD5248BRM2.5 | 功能描述:IC DGTL POT DUAL 2.5K I2C 10MSOP RoHS:否 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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