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.
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
_______________________________________________________________________________________ 9
Pin Description
Shutdown Logic Input. Connect to GND to place the device in shutdown. Connect to V
operation.
Input Select. Connect to GND to select Video Input A as the video source. Connect to V
Video Input B as the video source.
Positive Power Supply. Bypass to GND with a 0.1µF capacitor.
