MAX5413EUD 查看數據表（PDF） - Maxim Integrated

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MAX5413EUD

Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP

Maxim Integrated 

Dual, 256-Tap, Low-Drift, Digital Potentiometers

in 14-Pin TSSOP

POT REGISTER LOADED

CS

SCLK

1ST CLOCK PULSE

9TH CLOCK PULSE

DIN A0 D7 D6 D5 D4 D3 D2 D1 D0

MSB

LSB

TIME

Figure 2. Potentiometer Serial Data Timing Circuit

CS

SCLK

DIN

tCSO

tCSS

tDS

tDH

•••

tCH

tCL

•••

•••

tCSW

tCS1

tCP

tCSH

Figure 3. Detailed Serial Interface Timing Diagram

have been shifted in, they are latched into the appropri-

ate potentiometer control register when CS transitions

from low to high. Note that if CS is not kept low during

the entire data stream, the data will be corrupted and

the device will need to be reloaded.

The first bit A0 (address bit) is used to address one or

the other of the potentiometers for programming.

Potentiometer control register A is selected for writing

when A0 is ‘zero,’ and potentiometer control register B

is selected when A0 is ‘one.’

The MAX5413/MAX5414/MAX5415 feature POR circuit-

ry that sets the wiper to the midscale position at power-

up.

Applications Information

The MAX5413/MAX5414/MAX5415 are intended for a

variety of circuits where accurate, fine-tuning adjustable

resistance is required, such as in adjustable voltage or

adjustable gain circuit configurations. It is primarily used

in either a potentiometer divider or a variable-resistor

configuration.

Adjustable Current-to-Voltage Converter

Figure 5 shows the MAX5413/MAX5414/MAX5415 being

used with a MAX4250 low-noise op amp to fine tune a

current-to-voltage converter. Pins HX and WX of the

MAX5413/MAX5414/MAX5415 are connected to the

node between R3 and R2, and pin LX is connected to

ground. Circuit space is minimized due to both devices’

packaging.

Adjustable Gain Amplifier

Figure 6 shows how to use the MAX5413/MAX5414/

MAX5415 to digitally adjust the gain of a noninverting op

amp configuration. In Figure 6a, connect the MAX5413/

MAX5414/MAX5415 as a variable resistor in series with a

resistor to ground to form the adjustable gain control of a

noninverting amplifier.

Similarly, Figure 6b shows how to use the MAX5413/

MAX5414/MAX5415 as a 3-terminal potentiometer. In

this application, the MAX5413/MAX5414/MAX5415 low

5ppm/°C ratiometric tempco allows for a very stable

adjustable gain configuration over temperature.

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