AS1507 datasheet(14/17 Pages) AMSCO

tên linh kiện	AS1507

Giải thích chi tiết về linh kiện	Dual 256-Tap Digital Potentiometer with SPI Interface and High Endurance EEPROM

PDF	17 Pages

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nhà sản xuất	AMSCO [ams AG]

Trang chủ	http://www.ams.com

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AS1507

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

Positive LCD Bias Control

The device can be used in applications where a voltage-divider or variable resistor is used to make an adjustable, pos-

itive LCD-bias voltage, such as for the AS1120 LCD Driver. The op amp provides buffering and gain to the resistor-

divider network made by the potentiometer (Figure 27) or to a fixed resistor and a variable resistor (Figure 28).

Figure 27. Positive LCD Bias Control using a Voltage Divider

Figure 28. Positive LCD Bias Control using a Variable Resistor

Adjustable Voltage Reference

Figure 29 shows the device used as the feedback resistor in an adjustable voltage-reference application. Output volt-

ages of external voltage references, supervisory reset thresholds, or LED brightness control can be independently

adjusted by changing the wiper position of the AS1507.

Figure 29. Adjustable Voltage Reference Circuit – VOUT = 1.23V(50k

Ω/R2(kΩ)

–

VOUT

HIGH

WIPER

LOW

30V

AS1507

–

VOUT

HIGH

WIPER

LOW

30V

AS1507

HIGHA

WIPERA

LOWA

VIN

OUT

ADJ

VOUTREF1

AS1507

HIGHB

WIPERB

LOWB

VIN

OUT

ADJ

VOUTREF

AS1507

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