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MAX9392 Evaluation Kit
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
? 3V to 3.6V, 500mA power supply (VCC)
? LVDS signal generator (e.g., HP 8133A)
? Digital sampling oscilloscope or communication
analyzer (e.g., CSA8000)
Procedure
The MAX9392 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Connect the power supply to the VCC PCB pad.
Connect the ground terminal of the power supply to
GND PCB pad.
2) Set the signal generators to provide an LVDS signal
(this requires both a noninverting and inverting sig-
nal output from the signal generator).
3) Verify that a shunt is not installed at jumper JU1
(MAX9392 evaluation).
4) Verify that shunts are installed at jumpers JU2, JU3,
JU6, and JU7 (all outputs enabled).
5) Verify that a shunt is not installed across jumper
JU4 and a shunt is installed across jumper JU5
(channel A configured in dual repeater mode).
6) Verify that a shunt is not installed across jumper
JU8 and a shunt is installed across jumper JU9
(channel B configured in dual repeater mode).
7) Connect the signal generator’s noninverting signals
to the INA_ and INB_ SMA inputs.
8) Connect the signal generator’s inverting signals to
the INA_ and INB_ SMA inputs.
9) Connect all the OUT_ SMA output connectors to the
digital oscilloscope inputs using 50 Ω impedance
cables.
10) Enable the signal generators’ outputs.
11) Verify the signals by observing oscilloscope channels.
Detailed Description of Hardware
The MAX9392 EV kit is a fully assembled and tested
PCB that simplifies the evaluation of the MAX9392
1.5GHz, dual 2 x 2 crosspoint switch. The EV kit
accepts LVDS and HSTL signals at each input and
converts the signals to LVDS output for each channel.
The MAX9392 EV kit is designed with 100 Ω differential
controlled impedance in a four-layer PCB. The board is
designed for direct differential probing at the LVDS
inputs/outputs and single-ended probing at the outputs
using the respective 2-pin headers. The EV kit operates
from a single 3.3V supply that provides 150mA of
output current.
The MAX9392 EV kit consists of two independent LVDS
channels (A and B) that can be configured to operate
in one of three modes (crosspoint switch, 1:2 splitter, or
dual repeaters), using on-board jumpers. All differential
receiver inputs (IN_) are terminated with two series-
connected 49.9 Ω resistors. Resistor PCB pads
R11–R18 are provided at the EV kit output channels for
application-dependent termination.
Power Supply
The MAX9392 EV kit can utilize up to three power sup-
plies. VCC is used as the power source for the
MAX9392 and the logic inputs. VTERM_IN and
VTERM_OUT PCB pads are used for input- and output-
termination voltages when evaluating the MAX9393.
VTERM_IN has a 0 to VCC - 1.2V input supply voltage
range. VTERM_OUT should be set to the respective
LVDS common-mode or bias voltage.
Input Signals
The MAX9392 accepts LVDS or HSTL differential input
signals. The differential high threshold is +100mV and
the differential low threshold is -100mV. The SMA input
connectors for the circuit are labeled INA_, INB_ (non-
inverting) and INA_ , INB_ (inverting). All differential
inputs are terminated with two 49.9 Ω resistors (R3–R10)
to create a 100 Ω impedance termination. The input sig-
nals can be monitored with a differential signal probe
placed across header pins J1–J4 for the desired signal.
Output Signals
The four differential outputs can be accessed at header
pins J5–J8 with shielded twisted-pair cables or differ-
ential probes. Pin 1 is the inverting signal ( OUT_ ) and
Pin 2 is the noninverting signal (OUT_). When testing
the EV kit using differential probes or twisted pairs,
populate resistor PCB pads R11 –R18 with 49.9 Ω
(0603) surface-mount resistors. In addition to populat-
ing resistors R11–R18, terminate the twisted-wire pair
with a 100 Ω resistor at the far end of the wire. All differ-
ential output pairs are laid out with equal trace length
having a maximum length difference of 10 mils and
100 Ω controlled differential-impedance traces.
Leave coupling capacitors C11–C18 in series with the
outputs (OUT_, OUT_ ) and resistor PCB pads R11–R18
unpopulated when interfacing the output SMA OUT_
connectors to 50 Ω impedance oscilloscope inputs.
2
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