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參數(shù)資料
| 型號： | MAX5461 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | TOOL |
| 中文描述： | 32抽頭FleaPoT™、2線數(shù)字電位器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 264K |
| 代理商： | MAX5461 |
M
32-Tap FleaPoT
, 2-Wire Digital
Potentiometers
6
_______________________________________________________________________________________
Power-On Reset
All parts in this family feature power-on reset (POR) cir-
cuitry that sets the wiper position to midscale at power-
up. By default, the chip is in the increment mode.
Applications Information
The MAX5460
–
requiring digitally controlled adjustable resistance,
such as LCD contrast control, where voltage biasing
adjusts the display contrast.
Controlling a Switch-Mode
LCD Bias Generator
Figure 3 shows an application where the variable resis-
tor is used with a MAX1771 to make an adjustable posi-
tive LCD-bias circuit. The output of the MAX1771 is a
positive voltage that is digitally controlled through the
MAX5461/MAX5464/MAX5467. Similarly, Figure 4
shows the application of the variable resistor in a digi-
tally controlled negative LCD-bias circuit along with the
MAX774/MAX775/MAX776.
Alternative Positive
LCD Bias Control
Alternatively, use an op amp to provide buffering and
gain to the output of the MAX5462/MAX5465/MAX5468.
Connect the mechanical potentiometer to the positive
input of a noninverting op amp (Figure 5) to select a
portion of the input signal by digitally controlling the
wiper terminal. Figure 6 shows a similar circuit for the
MAX5461/MAX5464/MAX5467.
Adjustable Gain
Figure 7 shows how to use the variable resistor to digi-
tally adjust the gain of a noninverting op amp configura-
tion. Connect the MAX5461/MAX5464/MAX5467 in
series with a resistor to ground to form the adjustable
gain control of a noninverting amplifier. The MAX5460
–
MAX5468 have a low 5ppm/
°
C ratiometric tempco that
allows for a very stable adjustable gain configuration
over temperature.
Figure 3. Adjustable Positive LCD Bias
Figure 4. Adjustable Negative LCD Bias
MAX774
MAX775
MAX776
OUT
V+
SHDN
CS
FB
EXT
GND
P
7
8
C2
0.1
μ
F
R3
0.07
R1
R2
R
VAR
C1
150
μ
F
6
5
2
3
1
REF
4
Q1
Si9435
1N5822/
MBR340
L1
22
μ
H
C4
*
V
IN
C3
0.1
μ
F
V
OUT
*
MAX774 = 330
μ
F, 10V
MAX775/MAX776 = 120
μ
F, 20V
V
OUT(MAX)
OUT(MIN)
V
REF
= R2 , V
REF
= R2
VAR
V
REF
- V
FB
≥
5
μ
A (FOR 2% GAIN-SETTING ACCURACY)
R1 + R
VAR
MAX5461
MAX5464
MAX5467
MAX1771
V
IN
= 5V
REF
SHDN
AGND
GND
N
MTD20N03HDL
7
EXT
CS
FB
L1
22
μ
H
D1
1N5817-22
C4
300
μ
F
C5
C3
0.1
μ
F
5
4
6
1
8
3
2
V+
C1
68
μ
F
V
OUT
= 12V
AT 0.5A
R2
R
SENSE
40m
C2
0.1
μ
F
V
REF
= 1.5V
R1
R
VAR
V
OUT(MAX)
V
REF
= R2 + 1
V
OUT(MIN)
(
R2
)
+ 1
V
REF
=
VAR(MAX)
MAX5461
MAX5464
MAX5467
相關PDF資料 |
PDF描述 |
|---|---|
| MAX5462 | TOOL |
| MAX5463 | TOOL |
| MAX5464 | TOOL |
| MAX5465 | TOOL |
| MAX5466 | TOOL |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5461EXT | 制造商:Maxim Integrated Products 功能描述:32-TAP FLEAPOT 2-WIRE DIGITAL POTEN - Cut Tape Product |
| MAX5461EXT+ | 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 32POS 100KOHM SGL 6PIN SC-70 - Rail/Tube |
| MAX5461EXT+T | 功能描述:數(shù)字電位計 IC 32-Tap FleaPoT 2Wire RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5461EXT-T | 功能描述:數(shù)字電位計 IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5462EXT | 制造商:Maxim Integrated Products 功能描述:32-TAP FLEAPOT 2-WIRE DIGITAL POTEN - Cut Tape Product |
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