Datasheet > AD5254BRU10-RL7

AD5254BRU10-RL7

更新时间： 2024-02-07 11:03:48

品牌	Logo	应用领域
亚德诺 - ADI		电位器存储
页数	文件大小	规格书
28页	1160K
描述
Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers

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数据手册
替代型号

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AD5254BRU10-RL7 数据手册

AD5253/AD5254

For example, the R_WBvalues shown in Table 13 can be found on

AD5253 10 kΩ parts.

PROGRAMMABLE POTENTIOMETER OPERATION

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

ometer mode and the most common configuration is the

voltage divider operation (see Figure 44).

Table 13. R_WBvs. Codes; R_AB= 10 kΩ, A terminal = Open

D (DEC)

R_WB(Ω)

9918

5075

231

Output State

Full Scale

Midscale

1 LSB

Zero Scale (Wiper Resistance)

Figure 44. Potentiometer Mode Configuration

Note that in the zero-scale condition, a 75 Ω finite wiper

resistance is present. Care should be taken to limit the current

conduction between W and B in this state to no more than

5 mA continuous for a total resistance of 1 kΩ, or a 20 mA

pulse, to avoid degradation or possible destruction of the

internal switch contact.

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

V_W

×V_AB+V_B(AD5253)

(5)

(6)

256

×V_AB+V_B(AD5254)

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. Setting the

resistance value for R_WAstarts at a maximum value of resistance

and decreases as the data loaded in the latch increases in value

(see Figure 41). The general equation for this operation is

A more accurate calculation, which includes the wiper

resistance effect, yields

R_AB+ R_W

2^N

V_W(D) =

V_A

(7)

R_AB+ 2R_W

_WA(D) = [(64 – D)/64] × R_AB+ 75 Ω (AD5253)

_WA(D) = [(256 – D)/256] × R_AB+ 75 Ω (AD5254)

(3)

(4)

Where 2^Nis the number of steps. 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.

Table 14. R_WAvs. Codes; AD5253, R_AB= 10 kΩ,

B terminal = Open

D (DEC)

R_WA(Ω)

Output State

Full-Scale

Midscale

1 LSB

231

5075

9918

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 |V_A|, |V_W|, and |V_B| do not

exceed V_DD-to-V_SS.

10075

Zero-Scale

The typical distribution of R_ABfrom channel-to-channel

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

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

20ꢀ tolerance.

Rev. 0 | Page 24 of 28

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AD5254BRU10-RL7 替代型号

型号	品牌	替代类型	描述	数据表
AD5254BRU10	ADI	完全替代	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ10-RL7	ADI	类似代替	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ10	ADI	类似代替	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers

与AD5254BRU10-RL7相关器件

型号	品牌	获取价格	描述	数据表
AD5254BRU1-RL7	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRU50	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRU50-RL7	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ1	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ10	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ100	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ100-RL7	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ10-RL7	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ1-RL7	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5254BRUZ50	ADI	获取价格	Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers

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