MAX9680 查看數據表（PDF） - Maxim Integrated

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MAX9680

3V Video Amplifier with Internal Gain and Filter in SC70

Maxim Integrated 

3V Video Amplifier with

Internal Gain and Filter in SC70

Application Information

Input Considerations

The MAX9680 input is DC-coupled. When the supply volt-

age is between 2.7V and 3.6V, the input voltage range

extends from ground to 0.445V. When the supply volt-

age is between 2.8V and 3.6V, the input voltage range

extends from ground to 0.464V. A typical current-output

DAC that operates from a single supply usually creates

a composite video signal with a sync tip very close to

ground. Hence, the DAC output can be directly con-

nected to the MAX9680 input. Keep the board trace as

short as possible to minimize parasitic stray capacitance

and prevent unintentional high-frequency attenuation.

Output Considerations

The MAX9680 output must be DC-coupled. No

AC-coupled capacitors are allowed. The MAX9680 con-

nects directly to the video cable through a 75I series

back-termination resistor. The other end of the cable

should be properly terminated with a 75I resistor as

well. Because of this configuration, the peak-to-peak

amplitude as well as the DC level of the signal is divided

by two. The MAX9680 output signal is level-shifted up so

the sync tip is approximately 120mV.

Power-Supply Bypassing and Ground

The MAX9680 operates from a single-supply voltage

down to 2.7V, allowing for low-power operation. Bypass

VDD to GND with a 0.1FF capacitor. Place all external

components as close as possible to the device.

Typical Application Circuit

VIDEO ENCODER

DAC

VDD = 2.8V

IN

BUFFER

LPF

RIN

RSET

MAX9680

RSET

GENERAL-PURPOSE OUTPUT ENABLE

SHUTDOWN

CONTROL

G = 5.2V/V

OUT

75I

GND

PROCESS: BiCMOS

Chip Information

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