MAX4090 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX4090

3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown Current

Maxim Integrated 

3V/5V, 6dB Video Buffer with Sync-Tip Clamp

and 150nA Shutdown Current

FREQUENCY RESPONSE

0

-10

-20

-30

-40

-50

-60

0.1

1

10

100

FREQUENCY (MHz)

Figure 5. Frequency Response for R1 = R2 = 150Ω

Layout and Power-Supply Bypassing

The MAX4090 operates from single 2.7V to 5.5V sup-

ply. Bypass the supply with a 0.1µF capacitor as close

to the pin as possible. Maxim recommends using

microstrip and stripline techniques to obtain full band-

width. To ensure that the PC board does not degrade

the device’s performance, design it for a frequency

greater than 1GHz. Pay careful attention to inputs and

outputs to avoid large parasitic capacitance. Whether

or not you use a constant-impedance board, observe

the following design guidelines:

• Do not use wire-wrap boards; they are too inductive.

• Do not use IC sockets; they increase parasitic

capacitance and inductance.

• Use surface-mount instead of through-hole compo-

nents for better, high-frequency performance.

• Use a PC board with at least two layers; it should be

as free from voids as possible.

• Keep signal lines as short and as straight as possible.

Do not make 90° turns; round all corners.

3-POLE RECONSTRUCTION LPF

C3

6.8pF

VIDEO

CURRENT

DAC

R1

150Ω

L1

4.7μH

C1

120pF

C2

120pF

Figure 6. Sag Correction Configuration

R2

150Ω

RIS

49.9Ω

C4

0.1μF

VCC

VCC

IN

OUT

MAX4090

SHDN

FB

GND

VCC

C7

1μF

C5

22μF

R3

75Ω

VOUT

C6

22μF

10 ______________________________________________________________________________________

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