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参数资料
| 型号： | AD5254BRU50 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字电位计 |
| 英文描述： | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| 中文描述： | QUAD 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO20 |
| 封装： | MO-153AC, TSSOP-20 |
| 文件页数： | 24/28页 |
| 文件大小： | 834K |
| 代理商： | AD5254BRU50 |
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AD5253/AD5254
For example, the R
WB
values shown in Table 13 can be found on
AD5253 10 k parts.
Rev. 0 | Page 24 of 28
Table 13. R
WB
vs. Codes; R
AB
= 10 k, A terminal = Open
D (DEC)
R
WB
()
Output State
63
9918
Full Scale
32
5075
Midscale
1
231
1 LSB
0
75
Zero Scale (Wiper Resistance)
Note that in the zero-scale condition, a 75 finite wiper
resistance is present. Care should be taken to limit the current
conduction between W and B in this state to no more than
±5 mA continuous for a total resistance of 1 k, or a ±20 mA
pulse, to avoid degradation or possible destruction of the
internal switch contact.
Similar to the mechanical potentiometer, the resistance of the
RDAC between wiper W and terminal A also produces a
digitally controlled complementary resistance, R
WA
. When these
terminals are used, the B terminal can be opened. Setting the
resistance value for R
WA
starts at a maximum value of resistance
and decreases as the data loaded in the latch increases in value
(see Figure 41). The general equation for this operation is
R
WA
(
D
) = [(64 –
D
)/64] ×
R
AB
+ 75 (
AD5253
) (3)
R
WA
(
D
) = [(256 –
D
)/256] ×
R
AB
+ 75 (
AD5254
) (4)
Table 14. R
WA
vs. Codes; AD5253, R
AB
= 10 k,
B terminal = Open
D (DEC)
R
WA
()
63
231
32
5075
1
9918
0
10075
Output State
Full-Scale
Midscale
1 LSB
Zero-Scale
The typical distribution of R
AB
from channel-to-channel
matches is about ±0.15% within a given device. On the other
hand, device-to-device matching is process lot dependent with a
±20% tolerance.
PROGRAMMABLE POTENTIOMETER OPERATION
If all three terminals are used, the operation is called potenti-
ometer mode and the most common configuration is the
voltage divider operation (see Figure 44).
0
A
B
W
V
I
V
C
Figure 44. Potentiometer Mode Configuration
If the wiper resistance is ignored, the transfer function is simply
B
AB
W
V
V
D
V
+
×
=
64
(
AD5253
) (5)
B
AB
W
V
V
D
V
+
×
=
256
(
AD5254
) (6)
A more accurate calculation, which includes the wiper
resistance effect, yields
A
W
AB
W
AB
N
W
V
R
R
R
R
D
2
D
V
2
)
(
+
+
=
(7)
Where 2
N
is the number of steps. Unlike in rheostat mode
operation where the tolerance is high, potentiometer mode
operation yields an almost ratiometric function of
D
/2
N
with a
relatively small error contributed by the
R
W
terms. Therefore,
the tolerance effect is almost cancelled. Similarly, the ratiometric
adjustment also reduces the temperature coefficient effect to
50 ppm/°C, except at low value codes where
R
W
dominates.
Potentiometer mode operations include other applications such
as op amp input, feedback resistor networks, and other voltage
scaling applications. The A, W, and B terminals can in fact be
input or output terminals, provided |V
A
|, |V
W
|, and |V
B
| do not
exceed V
DD
-to-V
SS
.
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| AD5254BRU50-RL7 | 功能描述:IC DGTL POT QUAD 50K 20-TSSOP 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) |
| AD5254BRUZ1 | 功能描述:IC DGTL POT QUAD 1K I2C 20-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 |
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| AD5254BRUZ100 | 功能描述:IC POT DGTL QUAD 100K 20-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 |
| AD5254BRUZ100-RL7 | 功能描述:IC DGTL POT 256POS 100K 20TSSOP 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 |
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