Datasheet > AD5252_15

AD5252_15

更新时间： 2022-02-26 13:53:31

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
28页	575K
描述
Dual 64-/256-Position IC Nonvolatile Memory Digital Potentiometers

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AD5252_15 数据手册

AD5251/AD5252

Data Sheet

100

PROGRAMMABLE POTENTIOMETER OPERATION

If all three terminals are used, the operation is called potenti-

ometer mode (see Figure 43); the most common configuration

is the voltage divider operation.

Figure 43. Potentiometer Mode Configuration

If the wiper resistance is ignored, the transfer function is simply

D (Code in Decimal)

AD5251: V_W

AD5252: V_W

×V_AB+V_B

(5)

(6)

Figure 42. AD5251 R_WA(D) and R_WB(D) vs. Decimal Code

256

×V_AB+V_B

Since the digital potentiometer is not ideal, a 75 Ω finite wiper

resistance is present that can easily be seen when the device is

programmed at zero scale. Because of the fine geometric and

interconnects employed by the device, care should be taken to

limit the current conduction between W and B to no more than

5 mA continuous for a total resistance of 1 kΩ or a pulse of

20 mA to avoid degradation or possible destruction of the

device. The maximum dc current for AD5251 and AD5252 are

shown in Figure 21and Figure 22, respectively.

A more accurate calculation that includes the wiper resistance

effect is

R_AB+ R_W

2^N

V_W(D) =

V_A

(7)

R_AB+ 2R_W

where 2^Nis the number of steps.

Similar to the mechanical potentiometer, the resistance of the

RDAC between Wiper W and Terminal A also produces a

digitally controlled complementary resistance, R_WA. When these

terminals are used, the B terminal can be opened. The R_WA

starts at a maximum value and decreases as the data loaded into

the latch increases in value (see Figure 42). The general

equation for this operation is

Unlike in rheostat mode operation, where the tolerance is high,

potentiometer mode operation yields an almost ratiometric

function of D/2^Nwith a relatively small error contributed by the

R_Wterms. Therefore, the tolerance effect is almost cancelled.

Similarly, the ratiometric adjustment also reduces the

temperature coefficient effect to 50 ppm/°C, except at low value

codes where R_Wdominates.

AD5251: R_WA(D) = [(64 – D)/64] × R_AB+ 75 Ω

AD5252: R_WA(D) = [(256 – D)/256] × R_AB+ 75 Ω

The typical distribution of R_ABfrom channel-to-channel

matches is about 0.15% within a given device. On the other

hand, device-to-device matching is process-lot dependent with

(3)

(4)

Potentiometer mode operations include other applications, such

as op amp input, feedback-resistor networks, and other voltage-

scaling applications. The A, W, and B terminals can, in fact, be

input or output terminals, provided that |V_A|, |V_W|, and |V_B| do

not exceed V_DDto V_SS.

20% tolerance.

Rev. D | Page 24 of 28

1...21 22 232425 26 27 28

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与AD5252_15相关器件

型号	品牌	描述	获取价格	数据表
AD5252BRU1	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRU10	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRU100	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRU100-RL7	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRU10-RL7	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRU1-RL7	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRU50	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRU50-RL7	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ1	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ10	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ100	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ100-RL7	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ10-RL7	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ1-RL7	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ50	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252BRUZ50-RL7	ADI	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5252EVAL	ADI	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5253	ADI	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5253_12	ADI	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers	获取价格
AD5253_15	ADI	Quad 64-/256-Position IC Nonvolatile Memory Digital Potentiometers	获取价格

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