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參數(shù)資料
| 型號： | AD5228BUJZ502-RL7 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 32-Position Manual Up/Down Control Potentiometer |
| 中文描述： | 32工位手冊上/下控制電位器 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 341K |
| 代理商： | AD5228BUJZ502-RL7 |
AD5228
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.
Rev. 0 | Page 16 of 20
0
BUTTON
PUSH-DOWN
BUTTON
A
W
B
GND
10k
V
DD
PRE
PU
PD
U1
AD5228
C1
1
μ
F
C2
μ
F
5V
U2
AD8531
+
–
V+
V–
5V
C3
0.1
μ
F
R1
1k
4.R3
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
f
H1
= 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 f
H2
= 1/(2 × π × R5 × C3). As a result, C3 and C4 must be
large to make the frequency as low as f
H1
.
0
BUTTON
PBUTTON
A
W
B
10k
V
DD
PRE
GND
PU
PD
U1
AUDIO_INPUT
U3
AD8591
+
–
R4
10k
R3
10k
5V
C6
10
μ
F
C7
0.1
μ
F
5V
±
2.5V p-p
C1
1
μ
F
R1
10k
C2
0.1
μ
F
U2
SSM2211
V–
+
–
V+
6
4
3
2
7
1
8
5
5V
C5
0.1
μ
F
R6
8
R5
8
C3
470
μ
F
C44
470
μ
F
R2
10k
Figure 45. Audio Amplifier with Volume Control
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| AD5228BUJZ10-RL7 | 32-Position Manual Up/Down Control Potentiometer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5228BUJZ50-R2 | 功能描述:IC DGTL POT 50K UP/DN TSOT23-8 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:XDCP™ 接片:256 電阻（歐姆）:100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 ±300 ppm/°C 存儲器類型:非易失 接口:I²C（設(shè)備位址） 電源電壓:2.7 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
| 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 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| AD5228EVAL | 制造商:AD 制造商全稱: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 |
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