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AD8122 датащи(PDF) 11 Page - Analog Devices

номер детали AD8122
подробное описание детали  Triple Differential Receiver
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD8122 датащи(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
AD8122
Rev. PrC | Page 11 of 13
16
RED
BLUE
GREEN
CMV
RED CMV
BLUE CMV
AD8122
16
12
7
4
PEAK
25
26
27
28
V
V FILTER
V GAIN
HSYNC OUT
VSYNC OUT
32
31
GREEN
35
34
38
37
3
2
8
9
RECEIVED
RED VIDEO
RECEIVED
GREEN VIDEO
RECEIVED
BLUE VIDEO
RED VIDEO OUT
GREEN VIDEO OUT
BLUE VIDEO OUT
ANALOG
CONTROL
INPUTS
POWER DOWN CONTROL
PD
1
2
1k
1k
49.9
49.9
49.9
475
49.9
49.9
49.9
47pF
47pF
19
RED GAIN
15
GREEN GAIN
11
BLUE GAIN
23
V OFFSET
30
CABLE SELECT CONTROL
COAX/UTP
Figure 8. Basic Application Circuit with Common-Mode Sync Extraction (supplies and input protection not shown)
SYNC PULSE EXTRACTION USING COMPARATORS
The AD8122 is useful in many systems that transport computer
video signals, which are typically comprised of red, green, and
blue video signals and separate horizontal and vertical sync
signals (RGBHV). Because the sync signals are separate and not
embedded in the color signals, it is advantageous to transmit
them using a simple scheme that encodes them among the three
common-mode voltages of the RGB signals. The AD8134,
AD8142, AD8147, and AD8148 triple differential drivers are
natural complements to the AD8122 because they perform the
sync pulse encoding with the necessary circuitry on-chip.
The sync encoding equations follow:
[
]
H
V
K
V
Red CM
=
2
(1)
[
]
V
2
2
= K
V
Green CM
(2)
[
]
H
V
K
V
Blue CM
+
=
2
(3)
where:
Red VCM, Green VCM, and Blue VCM are the transmitted common-
mode voltages of the respective color signals.
K is an adjustable gain constant that is set by the driver.
V and H are the vertical and horizontal sync pulses, defined
with a weight of −1 when the pulses are in their low states, and a
weight of +1 when they are in their high states.
The AD8134, AD8142 and AD8146/AD8147/AD8148 data
sheets contain further details regarding the encoding scheme.
Figure 8 illustrates how the AD8122 comparators can be used to
extract the horizontal and vertical sync pulses that are encoded
on the RGB common-mode voltages by the aforementioned
drivers.
USING THE VPEAK, VGAIN, VFILTER, AND VOFFSET INPUTS
The VPEAK input is the main peaking control and is used to
compensate for the low-pass roll-off in the cable response. The
VGAIN input controls the wideband flat gain and is used to
compensate for the cable loss that is nominally flat.
The output of each channel contains an on-chip adjustable
lowpass filter to reduce high frequency noise. In most
applications, the filter cutoff frequency control, VFILTER, is
connected directly to the VPEAK voltage in order to provide
maximum bandwidth and minimum noise for a given VPEAK
setting. External lowpass filters are generally not required.
The VOFFSET input is used to produce an offset at the AD8122
output. The output offset is equal to the voltage applied to the
VOFFSET input, limited by the output swing limits.


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