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參數(shù)資料
| 型號(hào)： | AD5235BRU25 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | RES MF 1/8W 160K 1% 2PPM |
| 中文描述： | DUAL 25K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 1024 POSITIONS, PDSO16 |
| 封裝： | MO-153AB, TSSOP-16 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 102K |
| 代理商： | AD5235BRU25 |
PRELIMINARY TECHNICAL DATA
Nonvolatile Memory Digital Potentiometers
R
WA
(Dx) = [ (2
N
-Dx)/2
N
] * R
AB
+ R
W
eqn. 3
AD5235
REV PrD 6 NOV, 2000
Information contained in this Product Concept data sheet describes a product in the early definition stage. There is no guarantee that the
information contained here will become a final product in its present form. For latest information contact Walt Heinzer/Analog Devices, Santa Clara,
CA. TEL(408)562-7254; FAX (408)727-1550; walt.heinzer@analog.com
8
Similarly, eqn. 3 becomes:
R
WA
(Dx) = [ (1024-Dx)/1024 ] * R
AB
+ 50
eqn. 4
For example, when V
A
= 0V and B–terminal is tied to the wiper W
the following output resistance values will be set for the following
RDAC latch codes (applies to R
AB
=10K
potentiometers):
Dx
(DEC)
R
WA
(
)
Output State
1023
512
1
0
74
12500
25000
25050
Full-Scale
Mid-Scale
1 LSB
Zero-Scale
A ±1% typical distribution of R
AB
from channel-to-channel occurs
within the same package. On the other hand, device to device
matching is process lot dependent such that a maximum of ±30%
variation is possible. The change in R
AB
with temperature has a 50
ppm/°C temperature coefficient.
PROGRAMMING THE POTENTIOMETER DIVIDER
Voltage Output Operation
The digital potentiometer easily generates an output voltage
proportional to the input voltage applied to a given terminal. For
example connecting A–terminal to +5V and B–terminal to ground
produces an output voltage at the wiper which can be any value
starting at zero volts and up to 1 LSB less than +5V. Each LSB of
voltage is equal to the voltage applied across terminal AB divided
by the 2
N
resolution of the potentiometer divider. The general
equation defining the output voltage with respect to ground for any
given input voltage applied to terminals AB is:
V
W
(Dx) = Dx/2
N
* V
AB
+ V
B
eqn. 5
Since N=10,
V
W
(Dx) = (Dx/1024) * V
AB
+ V
B
eqn. 6
Operation of the digital potentiometer in the divider mode results in
more accurate operation over temperature. Here the output voltage
is dependent on the ratio of the internal resistors and not the
absolute value. Therefore, the drift reduces to 15ppm/°C.
ESD PROTECTION CIRCUITS
INPUTS
LOGIC
PINS
GND
V
DD
Figure 5A. Equivalent Digital Input ESD Protection
OUTPUTS
O1 & O2
PINS
GND
V
DD
Figure 5B. Equivalent Digital Output ESD Protection
OUTPUTS
SDO
PIN
GND
V
DD
Figure 5C. Equivalent SDO Output ESD Protection Circuit
Figure 5 shows the equivalent ESD protection circuit for digital
pins. Figure 6 shows the equivalent analog-terminal protection
circuit for the variable resistors.
POTENTIOMETER
TERMINALS
A, B, W
PINS
V
SS
Figure 6. Equivalent VR-Terminal ESD Protection
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| AD5235BRU250 | 制造商:Analog Devices 功能描述:Digital Potentiometer 1024POS 250KOhm Dual 16-Pin TSSOP 制造商:Analog Devices 功能描述:IC DUAL DIGITAL POT. 10-BIT |
| AD5235BRU250-RL7 | 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 1024POS 250KOHM DUAL 16TSSOP - Tape and Reel |
| AD5235BRU25-EP-RL7 | 制造商:Analog Devices 功能描述:Digital Potentiometer 1024POS 25KOhm Dual 16-Pin TSSOP T/R 制造商:Analog Devices 功能描述:DUAL 10-BIT SPI DIG. POT - Tape and Reel 制造商:Analog Devices 功能描述:IC DGTL POT 1024POS DUAL 16TSSOP 制造商:Analog Devices Inc. 功能描述:Digital Potentiometer ICs IC Dual 10-Bit SPI |
| AD5235BRU25-RL7 | 功能描述:IC DGTL POT DUAL 1024POS 16TSSOP RoHS:否 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(chǔ)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) |
| AD5235BRU-REEL7 | 制造商:Analog Devices 功能描述:- Tape and Reel |
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