MAXIM MAX2648 User Manual
Evaluates: MAX2648
MAX2648 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-2564; Rev 1; 10/02
Component List
Component Suppliers
General Description
The MAX2648 evaluation kit (EV kit) simplifies the evaluation of the MAX2648 5GHz low-noise amplifier. It
enables testing of the device’s performance and
requires no additional support circuitry. All inputs and
outputs use SMA connectors to facilitate easy connection of RF test equipment.
This EV kit is factory-tuned for operation in the
5150MHz to 5350MHz band but can be retuned for
operation in any band from 5000MHz to 6000MHz.
Table 1 provides component selection information to
retune the MAX2648 for operation in the 5725MHz to
5825MHz band. Consult the MAX2648 device S-parameter and noise parameter data (Tables 1 and 2 of the
MAX2648 data sheet) to design a matching network for
any other band.
Features
♦ Easy Evaluation of MAX2648
♦ +2.7V to +3.6V Single-Supply Operation
♦ All Peripheral Components Included
♦ Fully Assembled and Tested
Ordering Information
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE IC PACKAGE
MAX2648EVKIT -40°C to +85°C2
✕
3 UCSP
SUPPLIER PHONE FAX WEBSITE
ATC 631-622-4700 631-622-4748 www.atceramics.com
Coilcraft 800-322-2645 847-639-1469 www.coilcraft.com
EFJohnson 402-474-4800 402-474-4858 www.efjohnson.com
Kamaya 219-489-1533 219-489-2261 www.kamaya.com
Murata 770-436-1300 770-436-3030 www.murata.com
DESIGNATION QTY DESCRIPTION
100pF ±5% ceramic
C1, C2, C6 3
C3 1
C4 1
C5 1
C7 1
capacitors (0402)
Murata GRM36COG101J050A
1000pF ±10% ceramic
capacitor (0402)
Murata GRM36X7R102K050A
0.01µF ±10% ceramic
capacitor (0402)
Murata GRM36X7R103K016A
0.01µF ±10% ceramic
capacitor (1206)
Murata GRM42-6X7R103K2000A
1.0pF ±0.05pF ATC 500-series
porcelain capacitor (0603)
ATC 5001R0AT100X
DESIGNATION QTY DESCRIPTION
C8 1
J1, J2 2
L1 1
R2 1
U1 1
VCC, GND 2
0.9pF ±0.05pF ATC 500-series
porcelain capacitor (0603)
ATC 500S0R9AT100X
SMA connectors, edge mount
EFJohnson 142-0701-851
22nH wirewound inductor (0805)
Coilcraft 0805CS-220XJBC
8.2Ω ±1% resistor (0402)
Kamaya RMC16S-08R2FTH
MAX2648EBT, 2
Test points
DigiKey 5000-ND
✕
3 UCSP
Evaluates: MAX2648
MAX2648 Evaluation Kit
2 _______________________________________________________________________________________
Quick Start
The MAX2648 EV kit is fully assembled and factory tested. 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
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 calibration 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.
Table 1. Replacement Matching Elements
for 5800MHz Band
Figure 1. MAX2648 EV Kit Schematic
C1
100pF
WIDTH = 21 mils
LENGTH = 85 mils
C8
0.9pF
RFIN
GND
GND
U1
MAX2648
V
GND
RFOUT
CC
J1
SMA
DESIGNATION QTY DESCRIPTION
5725MHz to 5825MHz (HiperLAN/2, upper-UNII)
0.7pF high-Q porcelain
C7 1
C8 1
capacitor (0603)
ATC500S0R7AT100X
0.8pF high-Q porcelain
capacitor (0603)
ATC500S0R8AT100X
VCC
J3
C2
100pFC31000pF
22nH
C4
0.01µF
R2
L1
8.2Ω
C5
0.01µF
C7
1.0pF
C6
100pF
J4
WIDTH = 21 mils
LENGTH = 65 mils
WIDTH = 21 mils
LENGTH = 150 mils
ROGERS 4350, 10 mils FROM RF TRACE TO GROUND PLANE.
J2
SMA
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