MAX9541(2009) データシートの表示（PDF） - Maxim Integrated

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MAX9541
(Rev.:2009)

Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals

Maxim Integrated 

Quadruple, 2:1, Mux Amplifiers for

Standard-Definition and VGA Signals

Pin Description

PIN

NAME

FUNCTION

1

IN0A

Video Input A Channel 0

2

IN1A

Video Input A Channel 1

3

IN2A

Video Input A Channel 2

4

IN3A

Video Input A Channel 3

5

IN0B

Video Input B Channel 0

6

IN1B

Video Input B Channel 1

7

IN2B

Video Input B Channel 2

8

IN3B

Video Input B Channel 3

9

GND

Ground

10

SHDN

Shutdown Logic Input. Connect to GND to place the device in shutdown. Connect to VDD for normal

operation.

11

OUT3 Video Output Channel 3

12

OUT2 Video Output Channel 2

13

OUT1 Video Output Channel 1

14

OUT0 Video Output Channel 0

15

A/B

Input Select. Connect to GND to select Video Input A as the video source. Connect to VDD to select

Video Input B as the video source.

16

VDD

Positive Power Supply. Bypass to GND with a 0.1µF capacitor.

Detailed Description

The MAX9541 selects between two standard-definition

video sources that can each have up to four video sig-

nals, for example, RGB with composite sync (RGBS) or

RGB with sync-on-green. See Figure 1. It is also possible

to select between two sets of four composite video sig-

nals with blanking and sync (CVBS). With its integrated

lowpass filter (10MHz large-signal -3dB bandwidth typi-

cal), the MAX9541 can provide the anti-alias filtering

before an analog-to-digital converter (ADC) or the recon-

struction filtering after a digital-to-analog converter

(DAC). The incoming video signals can have any DC

bias because the MAX9541 has input sync-tip clamps

which restore the DC level. The output amplifiers have a

gain of 2V/V. The MAX9541 operates from a single 3.3V

supply and consumes low quiescent power and low

average power. In addition, the device also has shut-

down mode.

The MAX9542 is similar to the MAX9541 except that it

does not have the integrated lowpass filter. As a result,

the typical, large-signal bandwidth of the MAX9541 is

15MHz. Therefore, it can select between two video

sources that can each have up to four video signals

that are standard definition or VGA. A standard-defini-

tion signal set would be RGB with composite sync. A

VGA signal set would be RGB with a 640 x 480 resolu-

tion and up to 85Hz refresh rate. See Figure 2.

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