Datasheet 搜索 > 数字电位器 > Maxim Integrated（美信） > MAX5160MEUA 数据手册 > MAX5160MEUA 数据手册 5/9 页
器件3D模型￥ 8.572
MAX5160MEUA 数据手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
分类:
数字电位器
封装:
uMAX-8
描述:
低功耗数字电位器 Low-Power Digital Potentiometers
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
导航目录
MAX5160MEUA数据手册
Page:
of 9 Go
若手册格式错乱，请下载阅览PDF原文件
MAX5160/MAX5161
Low-Power Digital Potentiometers
_______________________________________________________________________________________ 5
Detailed Description
The MAX5160/MAX5161 consist of resistor arrays with
thirty-one resistive elements. Thirty-two tap points are
accessible to the wiper along the resistor string
between H and L. Logic inputs CS, U/D, and INC
determine the position of the wiper. With CS low and
U/D high, a high-to-low transition on INC increments the
internal counter, increasing the resistance between W
and L. When both CS and U/D are low, a high-to-low
INC transition decrements the internal counter, decreas-
ing the resistance between W and L. At either end
(maximum or minimum positions), additional transitions in
the direction of the end points will not change the counter
value (the counter will not wrap around).
The H and L terminals of the MAX5160 are similar to the
two end terminals of a mechanical potentiometer. The
tap W is equivalent to the variable tap (wiper) of the
potentiometer.
The MAX5161 is similar to the MAX5160 except that CS
internally connects to ground and the wiper terminal (W)
is shorted to the high terminal (H). The MAX5161 acts as
a variable resistor (a potentiometer with the wiper and
one end terminal shorted together).
The MAX5160/MAX5161 feature power-on reset circuit-
ry that sets the wiper position to midscale at power-up.
Applications Information
The MAX5160/MAX5161 are intended for circuits
requiring digitally controlled adjustable voltage or
adjustable gain, such as LCD contrast control, where
voltage biasing adjusts the display contrast.
Controlling a Switch-Mode
LCD Bias Generator
Figure 1 shows an application where the MAX5161 is
used with a MAX1771 to make an adjustable positive
LCD-bias circuit. The output of the MAX1771 is a posi-
tive voltage that is digitally controlled through the
MAX5160/MAX5161. Similarly, Figure 2 shows the
application of the MAX5161 in a digitally controlled
negative LCD-bias circuit along with the MAX774/
MAX775/MAX776.
MAX1771
V
IN
= 5V
REF
SHDN
AGND
GND
N
MTD20N03HDL
7
EXT
CS
FB
L1
22µH
D1
1N5817-22
C4
300µF
C5
C3
0.1µF
5
4
6
1
8
3
2
V+
C1
68µF
V
OUT
= 12V
AT 0.5A
R2
R
SENSE
40mΩ
C2
0.1µF
V
REF
= 1.5V
R1
R
VAR
V
OUT(MAX)
=
R2
+ 1
V
REF
R1
V
OUT(MIN)
=
(
R2
)
+ 1
V
REF
R1 + R
VAR(MAX)
MAX5161
Figure 1. Adjustable Positive LCD Bias
MAX774
MAX775
MAX776
OUT V+
SHDN
CS
FB EXT
GND
P
7
8
C2
0.1µF
R3
0.07Ω
R1
R2
R
VAR
C1
150µF
6
5
2
3
1
REF
4
Q1
Si9435
1N5822/
MBR340
L1
22µH
C4*
V
IN
C3
0.1µF
V
OUT
* MAX774 = 330µF, 10V
MAX775, MAX776 = 120µF, 20V
V
OUT(MAX)
=
R2
,
V
OUT(MIN)
=
R2
V
REF
R1 V
REF
R1 + R
VAR
V
REF
- V
FB
≥ 5µA (FOR 2% GAIN-SETTING ACCURACY)
R1 + R
VAR
MAX5161
Figure 2. Adjustable Negative LCD Bias
器件 Datasheet 文档搜索
AiEMA 数据库涵盖高达 72,405,303 个元件的数据手册，每天更新 5,000 多个 PDF 文件
