MAX4138 MAXIM [Maxim Integrated Products], MAX4138 Datasheet - Page 8

• Manufacturer Part Number: MAX4138
• Description: 1-Input/6-Output Video Distribution Amplifiers
• Manufacturer: MAXIM [Maxim Integrated Products]

To obtain the MAX4135/MAX4136’s full 185MHz band-
width, Microstrip and Stripline techniques are recom-
mended in most cases. To ensure that the PC board
does not degrade the amplifier’s performance, design
the board for a frequency greater than 1GHz. Even with
very short traces, use these techniques at critical
points, such as inputs and outputs. Whether you use a
constant-impedance board or not, observe the follow-
ing guidelines when designing the board:
1-Input/6-Output
Video Distribution Amplifiers
Figure 1. MAX4135 Typical Operating Circuit
8
__________Applications Information
* TO TERMINATE TRANSMISSION LINE
_______________________________________________________________________________________
+5V
+5V
-5V
Grounding, Bypassing,
DC
DC
DC
and PC Board Layout
0.1 F
75 *
75 *
75 *
75 *
75 *
75 *
0.1 F
0.1 F
AGND
AGND
VCCO
VCCO
OUT4
OUT5
OUT6
OUT1
OUT3
OUT2
VEEO
VEEO
10
11
12
4
8
9
1
2
6
7
3
5
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
Do not use wire-wrap boards. They are too inductive.
Do not use IC sockets. They increase parasitic
capacitance and inductance.
In general, surface-mount components have shorter
leads and lower parasitic reactance, giving better
high-frequency performance than through-hole com-
ponents.
The PC board should have at least two layers, with
one side a signal layer and the other a ground plane.
Keep signal lines as short and straight as possible.
Do not make 90° turns; round all corners.
The ground plane should be as free from voids as
possible.
MAX4135
R
SW1
SW2
SW3
SW4
SW5
SW6
F
IN
R
G
AGND
21
IN+
20
VEEI
19
AGND
18
N.C.
17
VCCI
16
SEL4
15
SEL5
14
SEL6
13
SEL1
24
SEL2
23
SEL3
22
75 *
0.1 F
0.1 F
-5V
+5V
VIDEO
IN
DC
DC