Quick Start
Recommended Equipment
• 2.7V to 3.6V DC power supply (VDD)
• Four composite video signal generators
• Video measurement equipment (e.g., Tektronix
VM700T or equivalent)
Procedure
The MAX9541 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on power supplies until all
connections are completed.
1) Verify that a shunt is installed across pins 1-2 of
jumper JU1 (EV kit enabled).
2) Verify that a shunt is installed across pins 2-3 of
jumper JU2 (Video Input A selected).
3) Connect the positive terminal of the DC power sup-
ply to the VDD pad on the EV kit. Connect the
ground terminal of the DC power supply to the
GND pad.
4) Connect the composite video test signals from the
video signal generators to the INPUT0A–INPUT3A
BNC connectors.
5) Connect the output signals from the OUTPUT0–
OUTPUT3 BNC connectors to the inputs of the
video measurement equipment.
6) Turn on the power supply and turn on the signal
generators.
7) Verify the output signals.
8) Reconfigure the composite video cable connec-
tions as required to test the Video Input B source.
See Table 2 for the channel-select input.
Detailed Description of Hardware
Input
Each video input signal of the MAX9541 EV kit is con-
figured for AC-coupling. The EV kit provides each input
with an AC-coupling 0.1µF capacitor and a termination
resistor. A sync-tip clamp at each input provides bias
for the incoming video signal. The sync-tip voltage is
internally set to 300mV.
Output
The video output amplifiers can both source and sink
load current, allowing output loads to be DC- or AC-
coupled. The amplifier output stage needs approxi-
mately 300mV of headroom from either supply rail. The
devices have an internal level-shift circuit that positions
the sync tip at approximately 300mV at the output. If
the supply voltage is greater than 3.135V (5% below a
3.3V supply), each amplifier can drive two DC-coupled
video loads to ground. If the supply is less than 3.135V,
each amplifier can drive only one DC-coupled or AC-cou-
pled video load.
The MAX9541 EV kit comes with DC-coupled outputs,
but can also be configured for AC-coupled outputs. To
configure the EV kit for AC-coupled outputs, cut the short
traces across C11–C14 and install 220µF or greater AC-
coupling output capacitors. Refer to the
Applications
Information, AC-Coupling the Outputs
section of the
MAX9541/MAX9542 IC data sheet for more information.
Jumper Selection
Shutdown Mode (SHDN)
The MAX9541 EV kit features an option to shut down all
the video outputs on the EV kit. For normal operation,
connect SHDN to VDD by placing a shunt across pins
1-2 of jumper JU1. For low-power shutdown mode, con-
nect SHDN to GND by placing a shunt across pins 2-3 of
jumper JU1. Table 1 lists the selectable jumper options.
Channel-Select Input (A/B)
The MAX9541 EV kit features 3-pin jumper JU2 to con-
trol the channel-select input A/B, which selects
between two standard-definition video sources. To
select Video Input A (INPUT0A–INPUT3A) as the video
source, connect A/B to GND by placing a shunt across
pins 2-3 of jumper JU2. To select Video Input B
(INPUT0B–INPUT3B) as the video source, connect A/B
to VDD by placing a shunt across pins 1-2 of jumper
JU2. Table 2 lists the selectable jumper options.
Evaluates: MAX9541/MAX9542
MAX9541 Evaluation Kit
2 _______________________________________________________________________________________
Table 1. Jumper JU1 Functions (SHDN)
*
Default position.
