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參數(shù)資料
| 型號： | MAX5455 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| 中文描述： | 雙路、256抽頭、非易失、I2C接口、數(shù)字電位器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 607K |
| 代理商： | MAX5455 |
M
Detailed Description
The MAX5450
–
MAX5455 contain two independent
resistor arrays each with 255-resistive elements. 256-
tap points are accessible to the wiper along the resistor
arrays between H and L (
Figure 2). Power-on reset cir-
cuitry sets the wiper to midscale (position 127) at
power-up.
Logic inputs
CS
, U/
D
, and
INC
determine the wiper
position of the MAX5450
–
MAX5455. With
CS
low and
U/
D
high, a high-to-low (falling edge) transition on
INC
,
increments the internal counter, which increases the
resistance between W and L. When both
CS
and U/
D
are low, a high-to-low
INC
transition decrements the
internal counter, decreasing the resistance between W
and L (Figure 1). The wiper performs a make-before-
break transition ensuring that there is never an open
circuit during a transition from one resistor tap to anoth-
er. When the wiper is at either end (max/min) of the
resistor array, additional transitions in the direction of
the endpoint will not change the counter value (the
counter will not wrap around).
The MAX5450/MAX5452/MAX5454 are similar to the
MAX5451/MAX5453/MAX5455 except for internal con-
nections. The MAX5450/MAX5452/MAX5454 internally
connect
INC1
to
INC2
, U/
D1
to U/
D2
, W1 to H1, and
W2 to H2 (Figures 3 and 4). The internal connections
configure the MAX5450/MAX5452/MAX5454 to be vari-
able resistors.
Applications Information
The MAX5450
–
MAX5455 are ideal for adjustable volt-
age or adjustable gain circuits where accurate
adjustable resistances are required.
Adjustable Current to Voltage Converter
Figure 5 shows the MAX5450/MAX5452/MAX5454 with
a MAX4250 low-noise op amp to fine-tune a current to
voltage converter. The physical sizes of both devices
minimize circuit space.
Adjustable Gain Amplifier
Figures 6a and 6b shows the MAX5450
–
MAX5455 digi-
tally adjusting the gain of the MAX4493 general-pur-
pose, dual supply op amp. Figure 6a shows the
MAX5450/MAX5452/MAX5454 variable resistor in
series with a resistor to ground to form the adjustable
gain control. Figure 6b shows the MAX5451/MAX5453/
MAX5455 as a 3-terminal potentiometer. In these appli-
cations the low 5ppm/
°
C ratiometric tempco allows for
a very stable adjustable gain over temperature.
Adjustable Linear Regulator
In Figure 7, the MAX5450/MAX5452/MAX5454 is shown
digitally adjusting the output voltage of the MAX8866
dual linear regulator. In this circuit, the MAX5450/
MAX5452/MAX5454 is connected in series with a resis-
tor to ground to form the adjustable feedback stage.
The 8-bit MAX5450/MAX5452/MAX5454 allows precise
tuning of the output voltage.
Dual, 256-Tap, Up/Down Interface,
Digital Potentiometers
8
_______________________________________________________________________________________
Figure 1. Digital Interface and Timing diagram
t
ID
t
IW
t
DI
t
CI
t
IL
t
IH
t
IC
CS_
W
_
U/D
_
INC
_
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5455EUD | 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 |
| MAX5455EUD+ | 功能描述:數(shù)字電位計 IC Dual 256-Tap Up/Down Interface 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 |
| MAX5455EUD+T | 功能描述:數(shù)字電位計 IC Dual 256-Tap Up/Down Interface 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 |
| MAX5455EUD-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 |
| MAX5456EEE | 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 |
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