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AD8381 Datasheet

  • AD8381

  • Fast, High Voltage Drive, 6-Channel Output DecDriverTM Decim...

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AD8381
TRANSFER FUNCTION
ACCURACY
The AD8381 has two regions of operation, selected by the INV
input, where the video output voltages are either above or below
a reference voltage, applied externally at the VMID input.
The transfer function defines the analog output voltage as the
function of the digital input code as follows:
錚?/div>
n
錚?/div>
VOUT
=
VMID
鹵
VFS
脳 錚?/div>
1 鈥?/div>
錚?/div>
錚?/div>
1023
錚?/div>
where:
n
= input code
VFS
= 2
脳
(VREFHI 鈥?VREFLO)
VOUT (V)
AVCC
(VMID + VFS)
To best correlate transfer function errors to image artifacts, the
overall accuracy of the AD8381 is defined by two parameters,
VDE and VCME.
VDE, the differential error voltage, measures the deviation of the
rms value of the output from the rms value of the ideal. It is depen-
dent on the difference between the output amplitudes VOUTN(n)
and VOUTP(n) at a particular code. The defining expression is:
VDE
=
錚?/div>
錚?/div>
1
n
錚訛６
脳
(
VOUTN
(
n
) 鈥?/div>
VOUTP
(
n
)
)
鈥?/div>
錚?/div>
VFS
脳 錚?/div>
1 鈥?/div>
錚?/div>
錚?/div>
1023
錚?錚?/div>
2
錚?/div>
錚?/div>
where:
1
脳
(
VOUTN
(
n
) 鈥?/div>
VOUTP
(
n
)
)
is the rms value of the output,
2
(VFS
脳
(1 鈥?/div>
n/1023))
is the rms value of the ideal.
VCME, the common-mode error voltage, measures the devia-
tion of the average value of the output from the average value of
the ideal. It is dependent on the average between the output
amplitudes VOUTN(n) and VOUTP(n) at a particular code.
The defining expression is:
VCME
=
INV = LOW
VOUTP(n)
INV = HIGH
VOUTN(n)
VMID
錚?/div>
1
錚?/div>
1
脳 錚?脳
(
VOUTN
(
n
)
+
VOUTP
(
n
)
)
鈥?/div>
VMID
錚?/div>
錚?/div>
2
錚?/div>
2
where:
1
脳
(
VOUTN
(
n
)
+
VOUTP
(
n
)
)
is the average value of the output,
2
1023
(VMID 鈥?VFS)
AGND
0
INPUT CODE
VMID
is the average value of the ideal.
MAXIMUM FULL-SCALE OUTPUT VOLTAGE
Figure 5. Transfer Function
The region over which the output voltage varies with input code
is selected by the INV input. When INV is LOW, the output
voltage increases from (VMID 鈥?VFS), (where VFS = the full-
scale output voltage), to VMID as the input code increases from
0 to 1023. When INV is HIGH, the output voltage decreases
from (VMID + VFS) to VMID with increasing input code.
For each value of input code there are then two possible values
of output voltage. When INV is LOW, the output is defined as
VOUTP(n) where n is the input code and P indicates the oper-
ating region where the slope of the transfer function is positive.
When INV is HIGH, the output is defined as VOUTN(n) where n
indicates the operating region where the slope of the transfer
function is negative.
The following conditions limit the range of usable output voltages:
鈥?The internal DACs limit the minimum allowed voltage at the
VMID input to 5.3 V.
鈥?The scale factor control loop limits the maximum full-scale
output voltage to 5.75 V.
鈥?The output amplifiers settle cleanly at voltages within 1.3 V
from the supply rails.
鈥?The common-mode range of the output amplifiers limit the
maximum value of VMID to AVCC 鈥?3.
At any given valid value of VMID, the voltage required to reach
any one of the above limits defines the maximum usable full-
scale output voltage VFSMAX.
VFSMAX is the envelope in Figure 6. The valid range of VMID
is the shaded area.
VFS (V)
AVCC/2
AVCC/2鈥?.3
5.75
4.3
VALID VMID
2
5.3
0
7
AVCC鈥?
AVCC/2
VMID (V)
AVCC鈥?
AVCC
Figure 6. VFSMAX vs. VMID
REV. 0
鈥?1鈥?/div>

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