Datasheet > 转换器 > 数字电位计> AD5231BRUZ100-RL7

AD5231BRUZ100-RL7

更新时间： 2024-10-28 12:56:23

品牌	Logo	应用领域
亚德诺 - ADI		转换器数字电位计存储电阻器光电二极管
页数	文件大小	规格书
28页	536K
描述
Nonvolatile Memory, 1024-Position Digital Potentiometer

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Data Sheet

AD5231

PROGRAMMABLE BIDIRECTIONAL CURRENT

SOURCE

RESISTANCE SCALING

The AD5231 offers 10 kΩ, 50 kΩ, and 100 kΩ nominal

resistance. For users who need lower resistance but want to

maintain the number of adjustment steps, they can parallel

multiple devices. For example, Figure 54 shows a simple scheme

of paralleling two AD5231s. To adjust half the resistance

linearly per step, users need to program both devices coherently

with the same settings and tie the terminals as shown.

For applications that require bidirectional current control or

higher voltage compliance, a Howland current pump can be a

solution. If the resistors are matched, the load current is

(

R2A + R2B

)

R2B

I_L=

×V_W

(8)

150kΩ

15kΩ

10pF

+15V

V+

Figure 54. Reduce Resistance by Half with Linear Adjustment Characteristics

–

OP2177

In voltage diver mode, by paralleling a discrete resistor as

shown in Figure 55, a proportionately lower voltage appears at

Terminals A–B. This translates into a finer degree of precision,

because the step size at Terminal W is smaller. The voltage can

be found as follows:

+2.5V

V–

R2B

+15V

V+

50Ω

AD5231

–15V

OP2177

V–

150kΩ

R2A

14.95kΩ

–

500Ω

–2.5V

–15V

(R_AB// R2)

V_W(D) =

× V_DD

(10)

R3 + R_AB// R2 1024

Figure 53. Programmable Bidirectional Current Source

R2B, in theory, can be made as small as necessary to achieve the

current needed within the A2 output current-driving capability.

In this circuit, OP2177 delivers 5 mA in both directions, and

the voltage compliance approaches 15 V. It can be shown that

the output impedance is

R1' R2B (R1 + R2A)

Z_O

(9)

Figure 55. Lowering the Nominal Resistance

R1R2' − R1' (R2A + R2B)

Figure 54 and Figure 55 show that the digital potentiometers

change steps linearly. On the other hand, pseudo log taper

adjustment is usually preferred in applications such as audio

control. Figure 56 shows another type of resistance scaling. In

this configuration, the smaller the R2 with respect to R1, the

more the pseudo log taper characteristic of the circuit behaves.

Z_Ocan be infinite if resistors R1 and R2 match precisely with R1

and R2A + R2B, respectively. On the other hand, Z_Ocan be

negative if the resistors are not matched. As a result, C1, in the

range of 1 pF to 10 pF, is needed to prevent oscillation from the

negative impedance.

Figure 56. Resistor Scaling with Pseudo Log Adjustment Characteristics

Rev. D | Page 25 of 28

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AD5231BRUZ100-RL7 替代型号

型号	品牌	替代类型	描述	数据表
AD5231BRUZ100	ADI	类似代替	Nonvolatile Memory, 1024-Position Digital Potentiometer
AD5231BRU100	ADI	类似代替	Nonvolatile Memory, 1024-Position Digital Potentiometers
AD5231BRU100-REEL7	ADI	功能相似	Nonvolatile Memory, 1024-Position Digital Potentiometers

与AD5231BRUZ100-RL7相关器件

型号	品牌	获取价格	描述	数据表
AD5231BRUZ10-REEL7	ADI	获取价格	Nonvolatile Memory, 1024-Position Digital Potentiometer
AD5231BRUZ50	ADI	获取价格	Nonvolatile Memory, 1024-Position Digital Potentiometer
AD5231BRUZ50-REEL7	ADI	获取价格	Nonvolatile Memory, 1024-Position Digital Potentiometer
AD5232	ADI	获取价格	8-Bit Dual Nonvolatile Memory Digital Potentiometer
AD5232BRU10	ADI	获取价格	8-Bit Dual Nonvolatile Memory Digital Potentiometer
AD5232BRU100	ADI	获取价格	8-Bit Dual Nonvolatile Memory Digital Potentiometer
AD5232BRU100-REEL7	ADI	获取价格	8-Bit Dual Nonvolatile Memory Digital Potentiometer
AD5232BRU10-REEL7	ADI	获取价格	8-Bit Dual Nonvolatile Memory Digital Potentiometer
AD5232BRU50	ADI	获取价格	8-Bit Dual Nonvolatile Memory Digital Potentiometer
AD5232BRU50-REEL7	ADI	获取价格	8-Bit Dual Nonvolatile Memory Digital Potentiometer

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