MAX2648_1 Datasheet, PDF (2/5 Pages) Maxim Integrated Products – Evaluation Kit

MAX2648 Evaluation Kit
Quick Start
The MAX2648 EV kit is fully assembled and factory test-
ed. Follow the instructions in the Connections and
Setup section for proper device evaluation.
Test Equipment Required
This section lists the recommended test equipment to
verify the operation of the MAX2648. It is intended as a
guide only, and some substitutions are possible.
• One DC power supply, +2.7V to +3.6V output
• One RF vector network analyzer capable of making
accurate measurements up to 6GHz (the HP/Agilent
8753D or 8753E with option 006 work nicely)
• Calibration kit for vector network analyzer
• Two high-quality 50Ω SMA cables
Connections and Setup
1) Allow the vector network analyzer to warm up, and
configure it for the following:
• Stimulus power level = -30dBm
• Linear frequency sweep: 5000MHz to 6000MHz,
at least 201 points
• Turn on averaging, at least four sweeps
2) Connect SMA cables to VNA, and perform a
full 2-port calibration, omitting the isolation
calibration if desired. Save this setup for recall later,
makng sure that the calibration array is included in
this saved state.
3) Connect the EV kit to the VNA.
4) Verify the DC power supply is set no higher than
+3.6V and is off before connecting the supply to the
Table 1. Replacement Matching Elements
for 5800MHz Band
DESIGNATION
QTY
DESCRIPTION
5725MHz to 5825MHz (HiperLAN/2, upper-UNII)
0.7pF high-Q porcelain
C7
1
capacitor (0603)
ATC500S0R7AT100X
0.8pF high-Q porcelain
C8
1
capacitor (0603)
ATC500S0R8AT100X
EV kit. A good starting voltage is +3.0V. Connect
the power supply between VCC and GND, and
power up the kit.
5) Restart averaging on the VNA, and verify that it
measures some forward gain. If the measurement
appears to be in error, verify the quality of the cali-
bration by replacing the EV kit with an SMA through.
Repeat the calibration procedure if necessary.
Analysis
Set the vector network analyzer to measure forward
gain (S21). Peak gain should be about 17dB at
5250MHz. Verify input return loss, output return loss,
and reverse isolation if so desired.
Detailed Description
This section describes the circuitry surrounding the IC
in the MAX2648 EV kits. For more detailed information
covering device operation, please consult the
MAX2648 data sheet.
J1
C1
100pF
WIDTH = 21 mils
LENGTH = 85 mils
SMA
C8
RFIN _U1
V_CC
0.9pF
GND _MAX2648 GND
GND
RFOUT
C2
100pF
C3
1000pF
L1
22nH
C4
0.01µF
R2
8.2Ω
VCC
J3
C5
0.01µF
J4
WIDTH = 21 mils
LENGTH = 65 mils
WIDTH = 21 mils
LENGTH = 150 mils
C6
100pF
J2
SMA
C7
1.0pF
Figure 1. MAX2648 EV Kit Schematic
ROGERS 4350, 10 mils FROM RF TRACE TO GROUND PLANE.
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