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MAX9507 Evaluation Kit/Evaluation System
Detailed Description of Hardware
The MAX9507 EV system (MAX9507EVCMAXQU+) con-
sists of the MAX9507 EV kit (MAX9507EVKIT+) and the
Maxim CMAXQUSB+ command module. The EV kit eval-
uates the MAX9507 DirectDrive video filter amplifier and
the CMAXQUSB+ provides the I 2 C/SMBus-compatible
interface for software control of the MAX9507’s video fil-
ter, analog switches, load detection, and other functions.
The EV kit is powered by a 1.7V to 2.625V power sup-
ply and is driven by a video source. The EV kit can
accept either a 250mV P-P or 1V P-P input full-scale
video signal and allows the use of both AC-coupled
and DC-coupled input signals. The output of the EV kit
is DC-coupled and provides an output full-scale video
signal that is nominally 2V P-P .
The MAX9507 amplifies standard-definition video signals
and sets the video black level near ground while con-
suming minimal power. The video output amplifier can
detect whether a load is present and indicates a change
I 2 C Pullup Resistors
The MAX9507 EV kit assumes pullup resistors will be
provided by the I 2 C master (e.g., the CMAXQUSB
board) on the SDA and SCL lines. To add these resis-
tors on the EV kit board instead, solder resistors to the
R11 and R12 locations.
Video Input Selection
The MAX9507 EV kit can be configured to accept either
a 250mV P-P or 1V P-P input full-scale signal at VIDIN
through the shunt location of JU2 (Table 2). When the
shunt is placed between pin 1 and pin 2, VIDIN sees a
standard termination of (R2 + R3) // (R1) = 75 Ω to GND
and there is no attenuation. When the shunt is placed
between pin 2 and pin 3, VIDIN again sees a standard
termination of (R2 + R3) // (R1) = 75 Ω , but the signal is
attenuated by R3 / (R2 + R3) = 1/4. Therefore, a 1V P-P
signal at VIDIN results in 250mV P-P at IN.
Table 2. Jumper JU2 Functions
in load status through the load change flag bit ( LCF ). In
addition, the MAX9507 has dual SPST analog switches
for routing additional audio, digital, or video signals.
I 2 C Slave Address Selection
The MAX9507 is programmable to one of four I 2 C slave
SHUNT POSITION
1-2*
2-3
*Default position.
INPUT SIGNAL
250mV P-P signal
1V P-P signal
addresses through jumper JU1 (Table 1). The address
is defined as the 7 most significant bits (MSBs) fol-
lowed by the read/write bit.
Table 1. Jumper JU1 Functions
Dual SPST Analog Switches
Additional audio, digital, video, or other signals can be
routed using the MAX9507’s SPST analog switches. The
MAX9507 EV kit provides external connections to these
switches through 50 Ω BNC connectors. Termination
SHUNT
POSITION
1-3*
1-4
1-5
1-2
DEV_ADD PIN
Connected to GND
Connected to VDD
Connected to SCL
Connected to SDA
WRITE
ADDRESS
0x98
0x9A
0x9C
0x9E
READ
ADDRESS
0x99
0x9B
0x9D
0x9F
resistors for the switches may be placed on the EV kit
board by soldering resistors in the R7–R10 locations.
*Default position.
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