MAX5160-MAX5161 MAXIM [Maxim Integrated Products], MAX5160-MAX5161 Datasheet - Page 6

• Manufacturer Part Number: MAX5160-MAX5161
• Description: Low-Power Digital Potentiometers
• Manufacturer: MAXIM [Maxim Integrated Products]

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.
Low-Power Digital Potentiometers
Figure 3. MAX5160 Positive LCD Bias Control
Figure 5. Adjustable Gain Circuit: a) MAX5161; b) MAX5160
6
_______________________________________________________________________________________
GND
U/D
INC
CS
a)
H
+5V
+5V
L
MAX5160
U/D
V
INC
W
V
GND
DD
DD
V
IN
H
+5V
L
Alternative Positive
LCD Bias Control
GAIN 6
MAX5161
V
30V
CC
V
V
OUT
OUT
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.
Figure 6 is the serial-interface timing diagram.
Figure 4. MAX5161 Positive LCD Bias Control
+5V
b)
INC
U/D
V
GND
DD
L
V
+5V
IN
H
L
W
MAX5160
MAX5161
H
V
CC
Adjustable Gain
Serial Interface
GAIN 6
30V
V
OUT
V
OUT