AD8386
Table 10. Truth Table @ GCTL = LOW
ACCURACY
SEN SD
Action
To best correlate transfer function errors to image artifacts, the
overall accuracy of the DecDriver is defined by two parameters,
VDE and VCME.
11 10
9
X
X
X
8
X
X
X
X
X
X
0
1
X
No Change to VAO.
Load VAO.
Start a Serial Interface Loading Cycle. No
change to VAO.
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
Serial DAC
[
VOUTN
(
n
)
−VOUTP
2
(
n
)
]
n
1023
⎛
⎝
⎞
⎟
⎠
The serial DAC is loaded via the serial interface. The output
voltage is determined by
VDE
(
n
)
=
− 1−
×VFS
⎜
VAO = SVRL + (SVRH − SVRL) × n/256
where n is the SD(0:7) serial input code.
VCME, the common-mode error voltage, measures ½ the dc
offset of the output. The defining expression is
1 VOUTN
(
n
)
+VOUTP n
( )
2
⎡
⎤
VCME
(
n
)
=
−VRL
Output VAO is designed to drive capacitive loads less than
0.002 μF or more than 0.047 μF. Load capacitances in the
0.002 μF − 0.047 μF range cause the output overshoot to exceed
100 mV.
⎢
⎥
⎦
2
⎣
3-WIRE SERIAL INTERFACE
The serial interface controls the 8-bit serial DAC and the video
output operating mode via a 12-bit serial word. The two most
significant bits (MSB) select the function and the eight least
significant bits (LSB) are the data for the serial DAC.
OUTPUT OPERATING MODES
In normal operating mode, the voltage of the video outputs is
determined by the inputs.
Table 8. Bit Definitions
In grounded output mode, the video outputs are forced to
(AGND + 0.2 V) typ.
Bit Name
SD (0:7)
SD8
Bit Functionality
8-Bit SDAC Data. MSB = SD7.
Not Used.
OVERLOAD PROTECTION
SD9
Not Used.
The overload protection employs current limiters and a thermal
protection circuit to protect the video output pins against accidental
shorts between any video output pin and AVCC or AGND.
SD10
SD11
VAO Load Selection.
Output Mode Selection When GCTL = 1.
Table 9. Truth Table @ GCTL = HIGH
The junction temperature trip point of the thermal protection
circuit is 165°C. Production tests guarantee a minimum
junction temperature trip point of 125°C. Consequently, the
operating junction temperature should not rise above 125°C
when the thermal protection circuit is enabled.
SEN SD
Action
11 10
9
X
X
X
8
X
X
X
0
0
1
0
1
0
Normal Output Mode. No change to VAO.
Normal Output Mode. Load VAO.
Grounded Output Mode. No change to
VAO.
For systems that operate at high internal ambient temperatures
and require large capacitive loads to be driven by the AD8386 at
high frequencies, junction temperatures above 125°C may be
required. In such systems, the thermal protection circuit should
either be disabled or a minimum airflow of 200 lfm must be
maintained.
1
X
1
X
X
X
X
X
Grounded Output Mode. Load VAO.
Start a Serial Interface Loading Cycle. No
change to VAO.
Rev. 0 | Page 14 of 20
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