MAX5527 Просмотр технического описания (PDF) - Maxim Integrated
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MAX5527 Datasheet PDF : 12 Pages
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One-Time Programmable, Linear-Taper Digital
Potentiometers
MAX5527
MAX5528
MAX5529
5V
H
W
L
30V
VOUT
5V
MAX5527
MAX5528
MAX5529
H
W
L
30V
VOUT
Figure 7. Positive LCD Bias Control Using a Voltage-Divider
W
L
5V
VIN
H
R3
C
VOUT
MAX5527
MAX5528
MAX5529
R1
H
R2
W
L
Figure 9. Programmable Filter
Figure 8. Positive LCD Bias Control Using a Variable Resistor
+5V
VIN
OUT
MAX6160
ADJ
GND
R1
W
R2
V0 REF
H
MAX5527
MAX5528
MAX5529
L
V0 = 1.23V
100kΩ
R2(kΩ)
FOR
THE
MAX5527
V0
=
1.23V
50kΩ
R2(kΩ)
FOR
THE
MAX5528
V0 = 1.23V
10kΩ FOR THE MAX5529
R2(kΩ)
Figure 10. Adjustable Voltage Reference
Applications Information
Use the MAX5527/MAX5528/MAX5529 in applications
requiring digitally controlled adjustable resistance,
such as LCD contrast control where voltage biasing
adjusts the display contrast, or for programmable filters
with adjustable gain and/or cutoff frequency.
Positive LCD Bias Control
Figures 7 and 8 show an application where the voltage-
divider or variable resistor is used to make an adjustable,
positive LCD bias voltage. The op-amp provides buffer-
ing and gain to the resistor-divider network made by the
potentiometer (Figure 7), or to a fixed resistor and a
variable resistor (Figure 8).
Programmable Filter
Figure 9 shows the configuration for a 1st-order pro-
grammable filter. The gain of the filter is adjusted by
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the gain (G), and the
-3dB cutoff frequency (fC), only up to frequencies one
decade below the wiper -3dB bandwidth.
G = 1 + R1
R2
fC
=
2π
x
1
R3
x
C
Adjustable Voltage Reference
Figure 10 shows the MAX5527/MAX5528/MAX5529
used as the feedback resistors in an adjustable-voltage
reference application.
10 ______________________________________________________________________________________
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