MAX8738EUA+ Maxim Integrated Products, MAX8738EUA+ Datasheet - Page 9
![IC CALIBR TFT VCOM 8UMAX](/photos/1/39/13936/406-8-msop_sml.jpg)
MAX8738EUA+
Manufacturer Part Number
MAX8738EUA+
Description
IC CALIBR TFT VCOM 8UMAX
Manufacturer
Maxim Integrated Products
Type
Video Filterr
Datasheet
1.MAX8738EUAT.pdf
(13 pages)
Specifications of MAX8738EUA+
Applications
LCD Display
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Maximum Clock Frequency
100 KHz
Operating Supply Voltage
4.5 V to 20 V
Maximum Power Dissipation
362 mW
Maximum Operating Temperature
+ 85 C
Maximum Supply Current
60 uA
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
1) Choose the maximum VCOM level (V
2) Select R1 between 10k
3) Calculate R2:
4) Calculate R
5) Verify that I
6) If I
Figure 4. Replacement of Mechanical Potentiometer Circuit
mum VCOM level (V
voltage (V
acceptable power loss from the AVDD supply rail.
a larger value for R1.
SET
I
SET MAX
exceeds 120µA, return to step 2 and choose
R
SET
(
POTENTIOMETER
R
AVDD
MECHANICAL
SET(MAX)
2
R
R
R
SET
A
B
C
AVDD
)
_______________________________________________________________________________________
:
).
(
20
V
AVDD
20
does not exceed 120µA:
MIN
V
(
V
AVDD
V
MAX
MAX
V
MAX
), and the AVDD supply
R
and 500k
SET
EEPROM-Programmable TFT VCOM
V
MAX
V
MIN
)
120
)
MAX
VCOM
based on the
R
A
1
R1 = R
R2 = R
R
), the mini-
R
SET
1
Calibrator with I
=
A
B
R
+ R
A
x (R
C
20 x R
B
+ R
B
C
)
7) The resulting resolution is:
A complete design example is given below:
1) V
2) If R1 = 200k , then R2 = 200k and
3) I
4) Resolution = 15.75mV.
Existing VCOM adjustment circuits using conventional
mechanical potentiometers can be translated into
MAX8738 circuits. Figures 4 and 5 show two common
adjustment circuits and their equivalent MAX8738 circuits.
EQUIVALENT CIRCUIT
GND
R
SET(MAX)
MAX8738
MAX
MAX8738
SET
R
SET
= 24.9k .
= 5V, V
Translating Existing Potentiometer
AVDD
SET
OUT
= 20µA.
(
MIN
AVDD
V
MAX
R2
R1
= 3V, V
127
2
V
MIN
C Interface
AVDD
)
= 10V.
VCOM
Circuits
9