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參數資料
| 型號： | AD8148ACPZ-RL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Triple Differential Driver for Wideband Video |
| 中文描述： | 三差分驅動器的寬帶視頻 |
| 文件頁數： | 18/24頁 |
| 文件大小： | 438K |
| 代理商： | AD8148ACPZ-RL |
AD8146/AD8147/AD8148
Sync pulse amplitudes applied to the AD8147 and AD8148
must be less than or equal to the positive supply voltage. In low
positive supply applications, such as those that use ±2.5 V supplies,
external limiting may be required because many logic families
produce amplitudes up to 5 V. Figure 32 illustrates how to use a
monolithic triple diode to limit a sync pulse with 5 V amplitude
to an amplitude of approximately 2 V.
Rev. 0 | Page 18 of 24
Driver bandwidth is affected to a small degree when driving the
100 Ω load presented by the two cables, as compared with
driving a typical 200 Ω load. Figure 34 illustrates the AD8146/
AD8147/AD8148 bandwidths when driving a 100 Ω load.
15
–3
FREQUENCY (MHz)
G
12
9
6
3
0
1000
100
10
1
AD8148
AD8147
AD8146
R
L, dm
= 100
V
OUT
= 2V p-p
0
301
1
6
2
5
3
4
HN2D02FUTW1T1
0V
+5V
INCOMING
SYNC PULSE
0V
+2V
LIMITED
SYNC PULSE
0
Figure 32. Limiting Sync Pulse Amplitude in Low Positive Supply Applications
DRIVING TWO UTP CABLES WITH ONE DRIVER
Some applications require driving two UTP cables with a single
driver. Each individual driver of the AD8146/AD8147/AD8148
is capable of driving two doubly terminated cables, which places
a differential load of 100 Ω across the outputs of the driver.
Figure 33 illustrates how to drive two cables.
Figure 34. Large Signal Frequency Response Driving 100 Ω Loads
USING THE AD8146 AS A RECEIVER
While the AD8146 excels as a differential driver, it can also be
used as a differential-to-differential receiver applied as an
input buffer that protects a more sophisticated device, such as a
differential crosspoint switch. See Figure 35 for an illustration of
this type of application.
Because the AD8146 V
OCM
input pins are uncommitted, any
incoming common-mode signal, such as encoded sync pulses,
can be reproduced at the AD8146 outputs by stripping it from
the received signal and applying it directly to the V
OCM
pin.
The two series 54.9 Ω resistors form a differential termination
resistor of 109.8 Ω, which when loaded with the 1 kΩ differential
input resistance of the AD8146, provides an overall termination
of approximately 100 Ω. The received common-mode voltages
are available at the center taps between the two resistors.
AD8146/AD8147/AD8148
49.9
49.9
100
100
100
UTP
49.9
49.9
100
UTP
V
OCM
0
Figure 33. Driving Two UTP Cables With One Driver
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