MAX4141 Maxim, MAX4141 Datasheet - Page 6

• Manufacturer Part Number: MAX4141
• Description: 330MHz / 4x1 Precision Video Multiplexer
• Manufacturer: Maxim

The MAX4141 video switch is manufactured with
Maxim’s proprietary complementary bipolar process
that yields high bandwidth and low capacitance. To
maintain a wide bandwidth, the MAX4141 incorporates
a straightforward structure of input and output buffers.
Make-before-break switching is employed to reduce
noise and glitches, even when switching from part to
part in large arrays. The input buffers provide a con-
stant, high input impedance. And, they prevent the
make-before-break action from feeding back to the
input and causing noise and/or glitches.
The design of the switching mechanism limits the
inevitable glitch to within 13mVp-p. In addition, the
glitch pulse is positive to avoid confusion with any neg-
ative sync pulses.
Unity-gain output buffers isolate other inputs from the
switching action of large multiplex arrays. These buffers
can drive 5kΩ resistive loads. Load capacitance is lim-
ited only by system bandwidth requirements.
The MAX4141 does not contain buffer latches. The digi-
tal inputs control the switch transparently.
330MHz, 4x1 Precision Video Multiplexer
6
______________________________________________________________Pin Description
_______________Detailed Description
2, 4, 6
_______________________________________________________________________________________
PIN
10
11
12
13
14
1
3
5
7
8
9
FUNCTION
GND
OUT
N.C.
V
IN0
IN1
IN2
IN3
V
EN
A1
A0
CC
EE
Signal Input
Analog (Signal) Ground. Since inputs are isolated by these grounds, they should be as noise-free
as possible.
Signal Input
Signal Input
Signal Input
No Connect—not internally connected.
Output Enable and device shutdown. A logic high on this pin enables the output. A logic low
causes the output to assume a high-impedance state and reduces operating current.
Negative Power-Supply Voltage. Decouple to power ground.
Signal Output
Positive Power-Supply Voltage. Decouple to power ground.
Channel Selection Bit. See truth tables.
Channel Selection Bit. See truth tables.
In order to obtain the MAX4141’s full 330MHz bandwidth,
Microstrip and Stripline techniques are recommended in
most cases. To ensure your PC board does not degrade
the switch’s performance, it’s wise to design the board
for a frequency greater than 1GHz. Even with very short
runs, it’s good practice to use this technique at critical
points, such as inputs and outputs. Whether you use a
constant-impedance board or not, observe the following
guidelines when designing the board:
• Do not use wire-wrap boards, because they are too
• Do not use IC sockets. They increase parasitic
• In general, surface-mount components have shorter
• The PC board should have at least two layers, with
• Keep signal lines as short and as straight as possi-
• The ground plane should be as free from voids as
__________Applications Information
inductive.
capacitance and inductance.
leads and lower parasitic reactance, and give better
high-frequency performance than through-hole com-
ponents.
one side a signal layer and the other a ground plane.
ble. Do not make 90° turns; round all corners.
possible.
DESCRIPTION
Grounding, Bypassing,
and PC Board Layout