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参数资料
| 型号： | AD5227BUJZ10-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 10K UP/DN TSOT23-8 |
| 标准包装： | 250 |
| 接片： | 64 |
| 电阻（欧姆）： | 10k |
| 电路数： | 1 |
| 温度系数： | 标准值 35 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | 3 线串行（芯片选择，增/减） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 供应商设备封装： | TSOT-23-8 |
| 包装： | 带卷 (TR) |
AD5227
Rev. B | Page 10 of 1
6
THEORY OF OPERATION
The AD5227 is a 64-position 3-terminal digitally controlled
potentiometer device. It presets to a midscale at system power-
on. When CS is enabled, changing the resistance settings is
achieved by clocking the CLK pin. It is negative-edge triggered,
and the direction of stepping is determined by the state of the
U/D input. When the wiper reaches the maximum or the
minimum setting, additional CLK pulses do not change the
wiper setting.
04419-0-026
CS
U/D
CLK
GND
VDD
6-BIT UP/DOWN
CONTROL
LOGIC
POR
MIDSCALE
WIPER
REGISTER
A
W
B
AD5227
Figure 24. Functional Block Diagram
04419-
0-
027
B
W
A
D0
D2
D1
D4
D5
D3
RS
RS = RAB/64
RW
RS
RDAC
UP/DOWN
CTRL AND
DECODE
Figure 25. AD5227 Equivalent RDAC Circuit
PROGRAMMING THE DIGITAL POTENTIOMETERS
Rheostat Operation
If only the W-to-B or W-to-A terminals are used as variable
resistors, the unused terminal can be opened or shorted with W.
This operation is called rheostat mode and is shown in Figure 26.
04419-0-028
A
W
B
A
W
B
A
W
B
Figure 26. Rheostat Mode Configuration
The end-to-end resistance, RAB, has 64 contact points accessed
by the wiper terminal, plus the B terminal contact, assuming
RWB by one step. The direction is determined by the state of
U/D pin. The change of RWB can be determined by the number
of clock pulses, provided that the AD5227 has not reached its
maximum or minimum scale. ΔRWB can, therefore, be
approximated as
+
×
±
=
Δ
W
AB
WB
R
CP
R
64
(1)
where:
CP is the number of clock pulses.
RAB is the end-to-end resistance.
RW is the wiper resistance contributed by the on-resistance of
the internal switch.
Since in the lowest end of the resistor string a finite wiper
resistance is present, care should be taken to limit the current
flow between W and B in this state to a maximum pulse current
of no more than 20 mA. Otherwise, degradation or possible
destruction of the internal switches can occur.
Similar to the mechanical potentiometer, the resistance of the
RDAC between the Wiper W and Terminal A also produces a
digitally controlled complementary resistance, RWA. When these
terminals are used, the B terminal can be opened or shorted to
W. Similarly, ΔRWA can be approximated as
()
+
±
=
Δ
W
AB
WA
R
CP
R
64
(2)
Equations 1 and 2 do not apply when CP = 0.
The typical distribution of the resistance tolerance from device
to device is process lot dependent. It is possible to have ±20%
tolerance.
Potentiometer Mode Operation
If all three terminals are used, the operation is called
potentiometer mode. The most common configuration is the
voltage divider operation as shown in Figure 27.
04419-0-029
A
W
B
VI
VC
Figure 27. Potentiometer Mode Configuration
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5227BUJZ10-R22 | 制造商:AD 制造商全称:Analog Devices 功能描述:64-Position Up/Down Control Digital Potentiometer |
| AD5227BUJZ10-RL7 | 功能描述:IC DGTL POT UP/DN 10K TSOT23-8 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 |
| AD5227BUJZ10-RL72 | 制造商:AD 制造商全称:Analog Devices 功能描述:64-Position Up/Down Control Digital Potentiometer |
| AD5227BUJZ50 | 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 64POS 50KOHM SGL 8PIN TSOT - Bulk |
| AD5227BUJZ50-R2 | 功能描述:IC DGTL POT 50K UP/DN TSOT23-8 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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