AS1506
Datasheet - Application Information
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 26) or to a fixed resistor and a variable resistor (Figure 27).
Figure 26. Positive LCD Bias Control using a Voltage Divider
5V
HIGH
30V
AS1506
+
–
WIPER
VOUT
LOW
Figure 27. Positive LCD Bias Control using a Variable Resistor
5V
30V
+
VOUT
–
HIGH
AS1506
WIPER
LOW
Adjustable Voltage Reference
Figure 28 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 AS1506.
Figure 28. Adjustable Voltage Reference Circuit – VOUT = 1.23V(50kΩ/R2(kΩ)
5V
VIN
VOUTREF
OUT
ADJ
HIGH
AS1506
WIPER
LOW
www.austriamicrosystems.com
Revision 1.02
14 - 17
AMSCO [ AMS(艾迈斯) ]
