Datasheet > AD5160BRJZ5-RL72

AD5160BRJZ5-RL72

更新时间： 2022-04-21 19:57:45

品牌	Logo	应用领域
亚德诺 - ADI		数字电位计
页数	文件大小	规格书
16页	467K
描述
256-Position SPI-Compatible Digital Potentiometer

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AD5160BRJZ5-RL72 数据手册

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AD5160

THEORY OF OPERATION

The AD5160 is a 256-position digitally controlled variable

resistor (VR) device.

The general equation determining the digitally programmed

output resistance between W and B is

An internal power-on preset places the wiper at midscale

during power-on, which simplifies the fault condition recovery

at power-up.

256

_WB(D) =

×R_AB+R_W

(1)

where:

D is the decimal equivalent of the binary code loaded in the

8-bit RDAC register.

PROGRAMMING THE VARIABLE RESISTOR

Rheostat Operation

_ABis the end-to-end resistance.

The nominal resistance of the RDAC between Terminal A and

Terminal B is available in 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ. The

final two or three digits of the model number as listed in the

Ordering Guide section determine the nominal resistance value,

for example, in model AD5160BRJZ10, the 10 represents 10 kΩ;

and in AD5160BRJZ50, the 50 represents 50 kΩ.

R_Wis the wiper resistance contributed by the on resistance of

the internal switch.

In summary, if R_AB= 10 kΩ and the A terminal is open

circuited, the following output resistance R_WBis set for the

indicated RDAC latch codes.

The nominal resistance (R_AB) of the VR has 256 contact points

accessed by the wiper terminal, plus the B terminal contact. The

8-bit data in the RDAC latch is decoded to select one of the 256

possible settings.

Table 7. Codes and Corresponding R_WBResistance

D (Dec.)

R_WB(Ω)

9961

5060

Output State

255

128

Full Scale (R_AB− 1 LSB + R_W)

Midscale

1 LSB

Assuming a 10 kΩ part is used, the first connection of the wiper

starts at the B terminal for Data 0x00. Because there is a 60 Ω

wiper contact resistance, such connection yields a minimum of

60 Ω resistance between Terminal W and Terminal B.

Zero Scale (Wiper Contact Resistance)

Note that in the zero-scale condition, a finite wiper resistance of

60 Ω is present. Take care to limit the current flow between W

and B in this state to a maximum pulse current of no more than

20 mA. Otherwise, degradation or possible destruction of the

internal switch contact can occur.

The second connection is the first tap point, which corresponds

to 99 Ω (R_WB= R_AB/256 + R_W= 39 Ω + 60 Ω) for Data 0x01.

The third connection is the next tap point, representing 138 Ω

(2 × 39 Ω + 60 Ω) for Data 0x02, and so on. Each LSB data

value increase moves the wiper up the resistor ladder until the

last tap point is reached at 9961 Ω (R_AB− 1 LSB + R_W). Figure 39

shows a simplified diagram of the equivalent RDAC circuit

where the last resistor string is not accessed; therefore, there is

1 LSB less of the nominal resistance at full scale in addition to

the wiper resistance.

Similar to the mechanical potentiometer, the resistance of the

RDAC between the 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. The general equation for this operation is

256 − D

256

_WA(D) =

×R_AB+ R_W

(2)

R_S

For R_AB= 10 kΩ and the B terminal is open circuited, the

following output resistance R_WAis set for the indicated RDAC

latch codes.

R_S

Table 8. Codes and Corresponding R_WAResistance

D (Dec.)

R_WA(Ω)

Output State

Full Scale

Midscale

1 LSB

255

128

RDAC

5060

9961

10,060

LATCH

R_S

AND

DECODER

Zero Scale

Typical device-to-device matching is process lot dependent and

may vary by up to 30ꢀ. Because the resistance element is

processed in thin film technology, the change in R_ABwith

temperature has a very low 45 ppm/°C temperature coefficient.

Figure 39. Equivalent RDAC Circuit

Rev. B | Page 14 of 16

1...11 12 131415 16

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与AD5160BRJZ5-RL72相关器件

型号	品牌	获取价格	描述	数据表
AD5160EVAL	ADI	获取价格	256-Position SPI-Compatible Digital Potentiometer
AD5160EVAL3	ADI	获取价格	256-Position SPI-Compatible Digital Potentiometer
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AD5161BRM100-RL7	ADI	获取价格	256-Position SPI/I2C Selectable Digital Potentiometer
AD5161BRM10-RL7	ADI	获取价格	256-Position SPI/I2C Selectable Digital Potentiometer
AD5161BRM5	ADI	获取价格	256-Position SPI/I2C Selectable Digital Potentiometer
AD5161BRM50	ADI	获取价格	256-Position SPI/I2C Selectable Digital Potentiometer
AD5161BRM50-RL7	ADI	获取价格	256-Position SPI/I2C Selectable Digital Potentiometer

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