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參數(shù)資料
| 型號： | MAX442 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 140MHz, 2-Channel Video Multiplexer/Amplifier(2通道，140MHz，視頻多路開關(guān)/放大器) |
| 中文描述： | 140MHz、2通道、視頻多路復(fù)用放大器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 116K |
| 代理商： | MAX442 |
M
The Typical Operating Circuit shows the MAX442 dri-
ving a back-terminated 75
video cable. The back-ter-
mination resistor (at the MAX442 output) is included to
match the impedance of the cable’s driven end to the
characteristic impedance of the cable itself. This, plus
the load-termination resistor, eliminates signal reflec-
tions from the cable’s ends. The back-termination resis-
tor forms a voltage divider with the load impedance,
which attenuates the signal at the cable output by one-
half. The amplifier is operated with a 2V/V closed-loop
gain to provide unity gain at the cable’s video output.
Capac itive-Load Driving
Driving large capacitive loads increases the likelihood
of oscillation in most amplifier circuits. This is especial-
ly true for circuits with high loop gains, like voltage fol-
lowers. The amplifier’s output impedance and the
capacitive load form an RC filter that adds a pole to the
loop response. If the pole frequency is low enough, as
when driving a large capacitive load, the circuit phase
margin is degraded and oscillation may occur.
With capacitive loads greater than approximately 50pF
and the MAX442 configured as a unity-gain buffer, use
an isolation resistor in series with the load, as shown in
Figure 2. The resistor removes the pole from the loop
response caused by the load capacitance.
Channel S witc hing T ime/T ransient
When the MAX442 multiplexer is switched from one
channel to another, a small glitch will appear at the out-
put. Figure 3 shows the results of putting a 0V to 5V
pulse 100ns wide into A0.
140MHz, 2-Channel
Video Multiplexer/Amplifier
6
_______________________________________________________________________________________
MAX442
22
C
LOAD
> 50pF
OUT
IN
Figure 2. Capacitive-Load-Driving Circuit
A0 INPUT
5V/div
AMP
OUTPUT
200mV/div
GND
GND
Figure 3. Output Switching Transient when Switching Between
Two Grounded Inputs with R
L
= 100
INPUT
1V/V
CABLE
OUTPUT
1V/V
GND
GND
Figure 5. Pulse Response with R
L
= 100
(50
back-terminated
cable), A
VCL
= +2V/V
INPUT
1V/div
CABLE
OUTPUT
500mV/div
GND
GND
Figure 4. Pulse Response with R
L
= 100
(50
back-terminated
cable), A
VCL
= +1V/V
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