AD8384ASVZ Analog Devices Inc, AD8384ASVZ Datasheet - Page 16

• Manufacturer Part Number: AD8384ASVZ
• Description: IC DRIVER LCD 6CH 10BIT 80-TQFP
• Manufacturer: Analog Devices Inc
• Series: DecDriver™r

Specifications of AD8384ASVZ

• Display Type: LCD
• Interface: 3-Wire Serial
• Current - Supply: 40mA
• Voltage - Supply: 9 V ~ 18 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 80-TQFP Exposed Pad, 80-eTQFP, 80-HTQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Configuration: -
• Digits Or Characters: -

AD8384
ACCURACY
To best correlate transfer function errors to image artifacts, the
overall accuracy of the DecDriver is defined by two parameters:
VDE and VCME.
VDE, the differential error voltage, measures the difference
between the rms value of the output and the rms value of the
ideal. The defining expression is
VCME, the common-mode error voltage, measures ½ the dc
bias of the output. The defining expression is
TSTM CONTROL—TEST MODE
A LOW on this input allows serial interface control of the
output operating mode. A HIGH on this input forces the video
outputs and VAO1 to normal operating mode.
GROUNDED OUTPUT MODE
In normal operating mode, the voltage of the video outputs and
VAO1 are determined by the inputs.
In Grounded Output mode, the video outputs and VAO1 are
forced to AGND.
OVERLOAD PROTECTION
The overload protection employs current limiters and a thermal
switch, protecting the video output pins against accidental
shorts between any video output pin and AVCC or AGND.
The junction temperature trip point of the thermal switch is
165°C. Production test guarantees a minimum junction
temperature trip point of 125°C. Consequently, the operating
junction temperature should not be allowed to rise above 125°C.
For systems that operate at high internal ambient temperatures
and require large capacitive loads to be driven by the AD8384 at
high frequencies, a minimum airflow of 200 lfm should be
maintained to ensure junction temperatures below 125°C.
3-WIRE SERIAL INTERFACE
The serial interface controls two 8-bit serial DACs, the overload
protection and the video output operating mode via a 12-bit
wide serial word from a microprocessor. Four of the 12-bits
select the function and the remaining eight bits are the data for
the serial DACs.
VDE
(
n
VCME
)
=
[
VOUTN
(
n
)
=
1
2
(
⎡
⎢
⎣
n
VOUTN
– )
V
2
]
2
[ –
(
n
VOUTP
)
2
+
VOUTP
(
n
– )
(
n
V
)
1
–
]
(
–
V
⎛
⎜
⎝
2
1
2
+
–
V
1023
1
n
)
⎤
⎥
⎦
⎞
× ⎟
⎠
Rev. 0 | Page 16 of 24
VFS
Table 12. Bit Definitions
Bit
Name
SD(0:7)
SD8
SD9
SD10
SD11
Table 13. Truth Table
SEN
SERIAL DACS
Both serial DACs are loaded via the serial interface. The output
voltage is determined by the following equation:
Output VAO1 is designed to drive very large capacitive loads
above 0.047 µF. Lower capacitive loads may result in excessive
overshoot at VAO1.
LEVEL SHIFTERS
The characteristics of the level shifters are optimized based on
their intended use.
Seven level shifters—DX, CLX, CLXN, and ENBX(1:4)—are
optimized for “X direction, ” and three—DY, CLY, and CLYN—
are optimized for the “Y direction” control signals. One level
shifter, NRG, is designed to drive a large capacitive load and
optimized for an X direction control signal and two, DIRX and
DIRY are optimized for very low frequency control signals.
One level shifting edge detector, MONITI, MONITO, is
optimized to condition a synchronizing feedback reference
signal from the LCD.
VAO1, VAO2 = SVRL + SD(0:7) × (SVRH – SVRL)/256
11
X
0
1
0
1
8-Bit SDAC Data. MSB = SD7.
Not Used.
Not Used.
Output operating mode and SDAC selection control.
Output operating mode and SDAC selection control.
10
0
0
1
1
X
SD
9
X
X
X
X
X
8
X
X
X
X
X
Load VAO2. No change to VAO1. No
change to Grounded mode.
Load VAO1. Release outputs from
Grounded mode. No change to AO2.
Release Video Outputs and VAO1
from Grounded Output mode. No
change to VAO1 and VAO2 data.
Video Outputs and VAO1 to
Grounded Output mode. No change
to VAO1 and VAO2 data.
No Change.
Bit Functionality
Action