MAX4889AEVKIT+ Maxim Integrated Products, MAX4889AEVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX4889AEVKIT+
• Description: KIT EVAL FOR MAX4889
• Manufacturer: Maxim Integrated Products

Specifications of MAX4889AEVKIT+

• Main Purpose: Interface, Analog Switch
• Embedded: No
• Utilized Ic / Part: MAX4889A
• Primary Attributes: 8 x SPDT PCIe Passive Switch
• Secondary Attributes: 3 V ~ 3.6 V Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MAX4889A Evaluation Kit
Before beginning, the following equipment is needed:
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The MAX4889A EV kit is fully assembled and tested.
Follow the steps below to verify board operation and
eye diagram/jitter measurements. Caution: Do not turn
on the power until all connections are completed.
1) Connect the 3.3V/100mA power supply to the VCC
2) Verify that jumper JU1 is in the 1-2 position.
3) Set up the pulse data generator to a bit rate of
4) Use a pair of SMA cables to connect the differential
5) Use a single SMA cable to connect the trigger input
6) Use a single SMA cable to connect the clock input of
7) Use the other pair of SMA cables to connect the two
8) Set the digital serial analyzer to infinite persistence
9) Adjust the vertical scale to 100mV/div and horizon-
10) Turn on the DC power supply.
2
MAX4889A EV kit
3.3V/100mA DC power supply
Pulse data generator with frequency of at least
2.5GHz (e.g., Agilent 81142A)
Digital serial analyzer sampling oscilloscope with
frequency of at least 2.5GHz (e.g., Tektronix
DSA8200)
Six SMA cables of equal lengths
and GND pads of the EV kit. Do not turn on the
power until all connections are completed.
5Gbps, the V
NRZ (nonreturn-to-zero) mode, and desired psue-
dorandom binary (bit) sequence (PRBS)—e.g., 2
1 or 2
signals (DATA and DATA) of the pulse data genera-
tor to NO1+ and NO1- on the EV kit.
of the digital serial analyzer to the trigger output of
the pulse data generator.
the pattern sync module of the digital serial analyzer
to the clock output of the pulse data generator. This
is specific to the DSA8200 Tektronix scope.
sampling channels of the digital serial analyzer to
COM1+ and COM1- on the EV kit.
and select the math function of the signal ((COM1+)
- (COM1-)). Also set the trigger on digital serial ana-
lyzer to trigger on pattern sync module.
tal scale to 200ps/div on the digital serial analyzer.
_______________________________________________________________________________________
7
-1 patterns.
HI
and V
LO
Required Equipment
to +250mV, and -250mV,
Quick Start
Procedure
15
-
11) Enable the data and clock outputs on the pulse
12) Save the waveform on the digital serial analyzer.
13) Disable the data and clock output of the pulse data
14) Turn off the DC power supply.
15) Remove the pair of SMA cables connected to NO1+
16) Remove the pair of SMA cables connected to
17) Enable the data and clock outputs on the pulse
18) Compare the waveform to the waveform that
The MAX4889A evaluation kit (EV kit) provides a proven
design to evaluate the MAX4889A PCI Express (PCIe)
Gen II 5.0Gbps passive switch. The MAX4889A is an
octal single-pole/double-throw (8 x SPDT) ideal for
switching four half lanes of PCIe data between four des-
tinations. The MAX4889A EV kit is used for critical tests
(i.e., eye diagrams and s-parameter measurements
such as insertion loss, return loss, and off-isolation).
For simplicity, only one channel of the device is used in
the EV kit. Only the COM1_, NC1_, and NO1_ signals
are used in the EV kit. All signal traces coming out of
the MAX4889A are 100Ω differential controlled-imped-
ance traces. Once the traces split into separate direc-
tions, the traces are 50Ω single-ended controlled
impedances, which is equivalent to 100Ω differentially.
At the bottom of the EV kit board are calibration traces
that are used as a reference to differentiate the perfor-
mance of the switch from the traces and SMA connec-
tor providing a complete analysis of the MAX4889A.
The lengths of the traces are designed to be similar to
the above circuitry, but without the MAX4889A.The
traces starting from RCOM1_ and RN_1_ are 50Ω sin-
gle-ended controlled impedances. Once the traces run
parallel to each other and are matched side by side,
the traces are 100Ω differential controlled impedances.
The MAX4889A operates from a 1.65V to 3.6V supply.
Detailed Description of Hardware
data generator and observe the waveform on the
digital serial analyzer.
generator.
and NO1- on the EV kit and connect the cables to
RN_1+ and RN_1- on the EV kit.
COM1+ and COM1- on the EV kit and connect the
cables to RCOM1+ and RCOM1- on the EV kit.
data generator and observe the waveform on the
digital serial analyzer.
includes the MAX4889A and observe the jitter/eye
height of both systems. Take the difference in jit-
ter/eye height and that equals the extra jitter/eye
height coming from the MAX4889A.