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参数资料
| 型号： | AD5228BUJZ50-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 50K UP/DN TSOT23-8 |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1 |
| 接片： | 32 |
| 电阻（欧姆）： | 50k |
| 电路数： | 1 |
| 温度系数： | 标准值 35 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | 2 线按钮 |
| 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： | 标准包装 |
| 其它名称： | AD5228BUJZ50-R2DKR |
AD5228
Rev. A | Page 16 of 20
AUTOMATIC LCD PANEL BACKLIGHT CONTROL
With the addition of a photocell sensor, an automatic brightness
control can be achieved. As shown in Figure 44, the resistance
of the photocell changes linearly but inversely with the light
output. The brighter the light output, the lower the photocell
resistance and vice versa. The AD5228 sets the voltage level that
is gained up by U2 to drive N1 to a desirable brightness. With
the photocell acting as the variable feedback resistor, the change
in the light output changes the R2 resistance, therefore causing
U2 to drive N1 accordingly to regulate the output. This simple
low cost implementation of an LED controller can compensate
for the temperature and aging effects typically found in high
power LEDs. Similarly, for power efficiency, a PWM signal can
be applied at the gate of N2 to switch the LED on and off
without noticeable effect.
04422-
0-
045
PUSH-UP
BUTTON
PUSH-DOWN
BUTTON
A
W
B
10k
Ω
VDD
GND
PRE
PU
PD
U1
AD5228
C1
1
μF
C2
0.1
μF
5V
U2
AD8531
+
–
V+
V–
5V
C3
0.1
μF
R1
1k
Ω
R3
4.75k
Ω
R2
5V
PWM
N2
2N7002
N1
2N7002
WHITE
LED
D1
5V
PHOTOCELL
Figure 44. Automatic LCD Panel Backlight Control
AUDIO AMPLIFIER WITH VOLUME CONTROL
The AD5228 and SSM2211 can form a 1.5 W audio amplifier
with volume control that has adequate power and quality for
portable devices such as PDAs and cell phones. The SSM2211
can drive a single speaker differentially between Pins 5 and 8
without any output capacitor. The high-pass cutoff frequency is
fH1 = 1/(2 × π × R1 × C1). The SSM2211 can also drive two
speakers as shown in Figure 45. However, the speakers must be
configured in single-ended mode, and output coupling capacitors
are needed to block the dc current. The output capacitor and
the speaker load form an additional high-pass cutoff frequency
as fH2 = 1/(2 × π × R5 × C3). As a result, C3 and C4 must be
large to make the frequency as low as fH1.
04422-
0-
046
PUSH-UP
BUTTON
PUSH-DOWN
BUTTON
A
W
B
10k
Ω
VDD
PRE
GND
PU
PD
U1
AUDIO_INPUT
U3
AD8591
+
–
R4
10k
Ω
R3
10k
Ω
5V
C6
10
μF
C7
0.1
μF
5V
±2.5V p-p
C1
1
μF R1
10k
Ω
C2
0.1
μF
U2
SSM2211
+
–
V+
6
4
3
2
7
1
8
5
V–
5V
C5
0.1
μF
R6
8
Ω
R5
8
Ω
C3
470
μF
C44
470
μF
R2
10k
Ω
Figure 45. Audio Amplifier with Volume Control
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5228BUJZ50-R2 | 制造商:Analog Devices 功能描述:DIGIPOT 5BIT UP/DOWN 50K, SMD, 5228 |
| AD5228BUJZ50-RL7 | 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) |
| AD5228EVAL | 制造商:AD 制造商全称:Analog Devices 功能描述:32-Position Manual Up/Down Control Potentiometer |
| AD522AD | 制造商:Rochester Electronics LLC 功能描述:INSTRUMENTATION AMPLIFIER - Bulk |
| AD522B | 制造商:AD 制造商全称:Analog Devices 功能描述:High Accuracy Data Acquisition Instrumentation Amplifier |
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