Datasheet > AD5246

AD5246

更新时间： 2022-12-11 21:11:36

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	913K
描述
128-Position I2C Compatible Digital Resistor

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AD5246 数据手册

AD5246

TERMINAL VOLTAGE OPERATING RANGE

POWER-UP SEQUENCE

The AD5246 V_DDand GND power supply defines the boundary

conditions for proper 3-terminal digital potentiometer

operation. Supply signals present on terminals B and W that

exceed V_DDor GND will be clamped by the internal forward

biased diodes (see Figure 32).

Since the ESD protection diodes limit the voltage compliance at

terminals B and W (see Figure 32), it is important to power

V_DD/GND before applying any voltage to terminals B and W;

otherwise, the diode will be forward biased such that V_DDwill be

powered unintentionally and may affect the rest of the user’s

circuit. The ideal power-up sequence is in the following order:

GND, V_DD, digital inputs, and then V_B/V_W. The relative order of

powering V_Band V_Wand the digital inputs is not important as

long as they are powered after V_DD/GND.

LAYOUT AND POWER SUPPLY BYPASSING

It is a good practice to employ a compact, minimum lead-length

layout design. The leads to the inputs should be as direct as

possible with a minimum conductor length. Ground paths

should have low resistance and low inductance.

GND

Figure 32. Maximum Terminal Voltages Set by V_DDand GND

Similarly, it is a good practice to bypass the power supplies with

quality capacitors for optimum stability. Supply leads to the

device should be bypassed with 0.01 µF to 0.1 µF disc or chip

ceramic capacitors. Low ESR 1 µF to 10 µF tantalum or

electrolytic capacitors should also be applied at the supplies to

minimize any transient disturbance and low frequency ripple

(see Figure 34). Note that the digital ground should also be

joined remotely to the analog ground at one point to minimize

the ground bounce.

MAXIMUM OPERATING CURRENT

At low code values, the user should be aware that due to low

resistance values, the current through the RDAC may exceed

the 5 mA limit. In Figure 33, a 5 V supply is placed on the wiper,

and the current through terminals W and B is plotted with

respect to code. A line is also drawn denoting the 5 mA current

limit. Note that at low code values (particularly for the 5 kΩ and

10 kΩ options), the current level increases significantly. Care

should be taken to limit the current flow between W and B in

this state to a maximum continuous current of 5 mA and a

maximum pulse current of no more than 20 mA. Otherwise,

degradation or possible destruction of the internal switch

contacts can occur.

10µF

0.1µF

AD5246

GND

100.00

Figure 34. Power Supply Bypassing

10.00

5mA CURRENT LIMIT

= 5kΩ

1.00

= 10kΩ

= 50kΩ

0.10

0.01

= 100k

Ω

112

128

CODE (Decimal)

Figure 33. Maximum Operating Current

Rev. 0 | Page 14 of 20

1...11 12 131415 16 17...20

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与AD5246相关器件

型号	品牌	描述	获取价格	数据表
AD5246BKS100-R2	ROCHESTER	100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 128 POSITIONS, PDSO6, 2 X 2.1	获取价格
AD5246BKS100-R2	ADI	128-Position I2C Compatible Digital Resistor	获取价格
AD5246BKS100-RL7	ADI	128-Position I2C Compatible Digital Resistor	获取价格
AD5246BKS100-RL7	ROCHESTER	100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 128 POSITIONS, PDSO6, 2 X 2.1	获取价格
AD5246BKS10-R2	ADI	128-Position I2C Compatible Digital Resistor	获取价格
AD5246BKS10-R2	ROCHESTER	10K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 128 POSITIONS, PDSO6, 2 X 2.10	获取价格

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