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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)： | 5/8頁 |
| 文件大?。?/td> | 116K |
| 代理商： | MAX442 |
__________Applic ations Information
The MAX442’s bipolar construction results in a typical
channel input capacitance of only 4pF, whether the
channel is on or off. As with all ICs, the mux’s input
capacitance forms a single-pole RC lowpass filter with
the signal source’s output impedance. This filter can
limit the system’s signal bandwidth if the RC product
becomes too large. However, the MAX442’s low chan-
nel input capacitance allows full AC performance of the
amplifier, even with source impedances as great as
250
—a significant improvement over common mux or
switch alternatives.
Feedback resistors should be limited to no more than
500
to ensure that the RC time constant formed by the
resistors, the circuit board’s capacitance, and the
capacitance of the amplifier input pins does not limit
the system’s high-speed performance.
Power-S upply Bypassing
and Board Layout
Realizing the full AC performance of high-speed ampli-
fiers requires careful attention to power-supply bypass-
ing and board layout. Use a low-impedance ground
plane with the MAX442. With multilayer boards, the
ground plane should be located on the PC board’s
component side to minimize impedance between the
components and the ground plane. For single-layer
boards, components should be mounted on the board’s
copper side and the ground plane should include the
entire portion of the board that is not dedicated to a
specific signal trace.
To prevent oscillation and unwanted signal coupling,
minimize trace area at the circuit’s critical high-imped-
ance nodes, especially the amplifier summing junction
(the amplifier’s inverting input). Surround these critical
nodes with a ground trace, and include ground traces
between all signal traces to minimize parasitic coupling
that can degrade crosstalk and/or amplifier stability.
Keep signal paths as short as possible to minimize
inductance, and keep all input channel traces at equal
lengths to maintain the phase relationship between the
input channels.
Bypass all power-supply pins directly to the ground
plane with 0.1μF ceramic capacitors, placed as close
to the supply pins as possible. For high-current loads,
it may be necessary to include 1μF tantalum or alu-
minum-electrolytic capacitors in parallel with the 0.1μF
ceramic bypass capacitors. Keep capacitor lead
lengths as short as possible to minimize series induc-
tance; surface-mount (chip) capacitors are ideal for this
application.
Differential Gain and Phase Errors
In color video applications, lowest differential gain and
phase errors are critical for an IC, because they cause
changes in contrast and color of the displayed picture.
Typically, the MAX442’s multiplexer/amplifier combina-
tion has a differential gain and phase error of only
0.07% and 0.09°, respectively. This low differential
gain and phase error makes the MAX442 ideal for use
in broadcast-quality color video systems.
Coaxial-Cable Drivers
High-speed performance and excellent output current
capability make the MAX442 ideal for driving 50
or
75
coaxial cables. The MAX442 will drive 50
and
75
coaxial cables to ±3V.
M
140MHz, 2-Channel
Video Multiplexer/Amplifier
_______________________________________________________________________________________
5
_____________________Pin Desc ription
NAME
FUNCTION
1
IN0
Analog Input, channel 0
2
GND
Ground
PIN
3
IN1
Analog Input, channel 1
4
V-
Negative Power Supply, -5V
8
A0
Channel Address Input:
A0 = logic 0 selects channel 0,
A0 = logic 1 selects channel 1
7
V+
Positive Power Supply, +5V
6
V
OUT
Amplifier Output
5
IN-
Amplifier Inverting Input
MAX442
SOURCE:
TEKTRONIX
1910 DIGITAL GENERATOR
75
CABLE
75
CABLE
75
CABLE
75
75
75
75
470
470
MEASUREMENT:
TEKTRONIX
VM700 VIDEO
MEASUREMENT SET
Figure 1. Differential Gain and Phase Error Test Circuit
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