Alternative Positive

LCD Bias Control

Alternatively, use an op amp to provide buffering and

gain to the output of the MAX5160/MAX5161. Connect

the MAX5160 to the positive input of a noninverting op

amp (Figure 3) to select a portion of the input signal by

digitally controlling the wiper terminal. Figure 4 shows a

similar circuit for the MAX5161.

Adjustable Gain

Figure 5 shows how to use the MAX5161 to digitally

adjust the gain of a noninverting op amp configuration.

Connect the MAX5161 in series with a resistor to ground

to form the adjustable gain control of a noninverting

amplifier. The MAX5160/MAX5161 have a low 5ppm/°C

ratiometric tempco that allows for a very stable adjust-

able gain configuration over temperature.

Serial Interface

Figure 6 is the serial-interface timing diagram.

Low-Power Digital Potentiometers

6

_______________________________________________________________________________________

GAIN 6

30V

W

L

H

INC

CS

GND

+5V

+5V

U/D

MAX5160

Figure 3. MAX5160 Positive LCD Bias Control

GAIN 6

30V

L

H

GND

+5V

+5V

INC

U/D

MAX5161

Figure 4. MAX5161 Positive LCD Bias Control

L

H

GND

+5V

a)

b)

INC

U/D

L

H

W

MAX5161

MAX5160

Figure 5. Adjustable Gain Circuit: a) MAX5161; b) MAX5160