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| 型号： | EVAL-AD5228EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5228 DGTL POT |
| 标准包装： | 1 |
| 主要目的： | 数字电位器 |
| 已用 IC / 零件： | AD5228 |
| 已供物品： | 板 |
| 相关产品： | AD5228BUJZ10RL7DKR-ND - IC DGTL POT UP/DN 10K TSOT23-8 AD5228BUJZ100-RL7DKR-ND - IC DGTL POT 32POS 100K TSOT23-8 AD5228BUJZ10-R2-ND - IC DGTL POT 10K UP/DN TSOT23-8 AD5228BUJZ100-R2-ND - IC DGTL POT 100K UP/DN TSOT23-8 AD5228BUJZ50-R2TR-ND - IC DGTL POT 50K UP/DN TSOT23-8 AD5228BUJZ50-RL7-ND - IC DGTL POT 50K UP/DN TSOT23-8 AD5228BUJZ100-RL7CT-ND - IC DGTL POT 32POS 100K TSOT23-8 AD5228BUJZ10RL7CT-ND - IC DGTL POT UP/DN 10K TSOT23-8 AD5228BUJZ100-RL7TR-ND - IC DGTL POT 32POS 100K TSOT23-8 AD5228BUJZ10RL7TR-ND - IC DGTL POT UP/DN 10K TSOT23-8 |
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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