AS1507 austriamicrosystems AG, AS1507 Datasheet - Page 14

• Manufacturer Part Number: AS1507
• Description: Dual 256-Tap Digital Potentiometer
• Manufacturer: austriamicrosystems AG

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. Positive LCD Bias Control using a Voltage Divider
Figure 28. Positive LCD Bias Control using a Variable Resistor
Adjustable Voltage Reference
Figure 29
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 – V
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shows the device used as the feedback resistor in an adjustable voltage-reference application. Output volt-
5V
V
IN
OUT
ADJ
WIPERA
HIGHA
LOWA
AS1507
AS1507
HIGH
LOW
HIGH
AS1507
LOW
(Figure
5V
V
5V
OUTREF1
WIPER
27) or to a fixed resistor and a variable resistor
WIPER
OUT
Revision 1.00
= 1.23V(50kΩ/R
+
–
30V
+
–
30V
V
IN
OUT
ADJ
2
(kΩ)
WIPERB
V
OUT
V
HIGHB
LOWB
OUT
AS1507
V
OUTREF
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(Figure
28).
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