MAX5433LETA+T Maxim Integrated Products, MAX5433LETA+T Datasheet - Page 11

• Manufacturer Part Number: MAX5433LETA+T
• Description: IC POT DGTL 32-TAP NV I2C 8-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX5433LETA+T

• Package / Case: 8-TDFN Exposed Pad
• Mounting Type: Surface Mount
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Temperature Coefficient: 35 ppm/°C Typical
• Interface: I²C, 2-Wire Serial
• Resistance In Ohms: 100K
• Number Of Circuits: 1
• Memory Type: Non-Volatile
• Taps: 32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 9. Positive LCD Bias Control Using a Voltage-Divider
Use the MAX5432–MAX5435 in applications requiring
digitally controlled adjustable resistance, such as LCD
contrast control (where voltage biasing adjusts the dis-
play contrast), or for programmable filters with
adjustable gain and/or cutoff frequency.
Figures 9 and 10 show an application where the volt-
age-divider or variable resistor is used to make an
adjustable, positive LCD bias voltage. The op-amp pro-
vides buffering and gain to the resistor-divider network
made by the potentiometer (Figure 9) or to a fixed
resistor and a variable resistor (Figure 10).
Figure 11 shows the configuration for a 1st-order pro-
grammable filter. The gain of the filter is adjusted by
Figure 11. Programmable Filter
MAX5432
MAX5433
V
IN
MAX5432–
MAX5435
H
Applications Information
______________________________________________________________________________________
R3
W
5V
H
L
32-Tap, Nonvolatile, I
Positive LCD Bias Control
L
W
R2
C
H
L
Programmable Filter
30V
W
R1
V
V
OUT
OUT
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the gain (G) and the
3dB cutoff frequency (f
Figure 12 shows the MAX5432/MAX5433 used as the
feedback resistors in an adjustable voltage reference
application. Independently adjust the output voltages of
the MAX6160 from 1.23V to (V
the wiper position of the MAX5432/MAX5433.
Figure 10. Positive LCD Bias Control Using a Variable Resistor
Figure 12. Adjustable Voltage Reference
MAX5432–
MAX5435
V
2
V
0
0
= 1.23V
= 1.23V
C, Linear, Digital
MAX6160
Adjustable Voltage Reference
Potentiometers
GND
+5V
V
100kΩ
R
R
H
L
IN
50kΩ
5V
2
2
G
f
(kΩ)
(kΩ)
C
OUT
C
ADJ
=
FOR THE MAX5432
FOR THE MAX5433
=
).
W
1
W
2
+
π
R
R
1
2
×
R
R
IN
H
L
1
2
V
R
1
0
30V
- 0.2V) by changing
3
REF
×
MAX5432
MAX5433
C
V
OUT
11