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| 型号： | AD5227BUJZ10-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/16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 12 of 1
6
APPLICATIONS
MANUAL CONTROL WITH TOGGLE AND
PUSHBUTTON SWITCHES
The AD5227’s simple interface allows it to be used with
mechanical switches for simple manual operation. The states of
the CS and U/D can be selected by toggle switches and the CLK
input can be controlled by a pushbutton switch. Because of the
numerous bounces due to contact closure, the pushbutton
switch should be debounced by flip-flops or by the ADM812 as
shown in
04419-0-033
UP/DOWN
MR
RESET
VCC
GND
ADM812
CLK
AD5227
CS
U/D
5V
INCREMENT
Figure 31. Manual Push Button Up/Down Control
MANUAL CONTROL WITH ROTARY ENCODER
Figure 32 shows another way of using AD5227 to emulate
mechanical potentiometer in a rotary knob operation. The
rotary encoder U1 has a C ground terminal and two out-of-
phase signals, A and B. When U1 is turned clockwise, a pulse
generated from the B terminal leads a pulse generated from the
A terminal and vice versa. Signals A and B of U1 pass through a
quadrature decoder U2 that translates the phase difference
between A and B of U1 into compatible inputs for U3 AD5227.
Therefore, when B leads A (clockwise), U2 provides the AD5227
with a logic high U/D signal, and vice versa. U2 also filters
noise, jitter, and other transients as well as debouncing the
contact bounces generated by U1.
04419-0-034
U3
AD5227
DIGITAL
POTENTIOMETER
CLK
1
VDD
8
U/D
2
CS
7
A1
3
B1 6
GND
4
W1 5
B1
A1
W1
U2
LS7084
QUADRATURE
DECODER
RBIAS
1
CLK
8
VDD
2
U/D
7
VSS
3
X4/X1
6
A
4
B
5
B
C
A
U1
ROTARY
ENCODER
RE11CT-V1Y12-EF2CS
R3
10k
Ω
R1
10k
Ω
R2
10k
Ω
5V
Figure 32. Manual Rotary Control
ADJUSTABLE LED DRIVER
The AD5227 can be used in many electronics-level adjustments
such as LED drivers for LCD panel backlight control. Figure 33
shows an adjustable LED driver. The AD5227 sets the voltage
across the white LED D1 for the brightness control. Since U2
handles up to 250 mA, a typical white LED with VF of 3.5 V
requires a resistor, R1, to limit the U2 current. This circuit is
simple but not power-efficient, therefore the U2 shutdown pin
can be toggled with a PWM signal to conserve power.
04419-0-035
A
W
B
10k
Ω
VDD
GND
CS
CLK
U/D
U1
AD5227
C1
1
μF
C2
0.1
μF
5V
U2
AD8591
+
–
V+
V–
SD
5V
C3
0.1
μF
R1
6
Ω
WHITE
LED
D1
PWM
Figure 33. Low Cost Adjustable LED Driver
ADJUSTABLE CURRENT SOURCE FOR LED DRIVER
Since LED brightness is a function of current rather than
forward voltage, an adjustable current source is preferred over a
voltage source as shown in Figure 34.
04419-0-036
A
W
B
10k
Ω
R1
418k
Ω
GND
U2
AD5227
VDD
5V
CS
CLK
U/D
5V
U3
AD8591
+
–
V+
V–
5V
PWM
VIN
VOUT
GND
U1
ADP3333
ARM-1.5
SD
RSET
0.1
Ω
VL
ID
D1
Figure 34. Adjustable Current Source for LED Driver
The load current can be found as the VWB of the AD5227
divided by RSET.
SET
WB
D
R
V
I
=
(5)
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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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