19-1248; Rev 1; 5/98
MAX2620 Evaluation Kit
________________General Description
The MAX2620 evaluation kit (EV kit) simplifies evalua-
tion of the MAX2620 integrated oscillator with buffered
outputs. It includes a varactor-based tank circuit that
allows the VCO to tune across an approximately 30MHz
band in the 900MHz frequency range. Outputs utilize
50鈩?SMA connectors. The EV kit has a test port that
facilitates complete characterization of the MAX2620
tank port, enabling resonators to be designed for fre-
quency ranges other than that supplied with the EV kit.
____________________________Features
o
Complete, Tunable VCO Test Board with Tank
Circuit
o
Tuning in 900MHz Frequency Range
o
Low Phase Noise (-110dBc/Hz typical at 25kHz
offset from carrier)
o
Operates from Single +2.7V to +5.25V Supply
o
Two Output Buffers with 50鈩?SMA Connectors
o
Low-Power Shutdown Mode
o
Test Port for Oscillator Tank Port Characterization
o
Fully Assembled and Tested
Evaluates: MAX2620
____________________Component List
DESIGNATION QTY
C1, C7鈥揅10,
C12
C2, C11, C14
C3
C4, C6
C5, C13, C17
C15
D1
JU1, V
CC
,
GND
L1
L4
L3
OUT,
OUT,
TEST PORT
R1, R3
R2
R4
R5
SHDN
U1
VCONT
None
None
None
6
0
1
2
3
1
1
3
1
0
1
3
2
1
0
1
1
1
1
1
1
1
DESCRIPTION
1000pF, 10% ceramic capacitors
Not installed
2.7pF, 10% ceramic capacitor
1pF, 10% ceramic capacitors
1.5pF, 10% ceramic capacitors
10碌F, 卤10%, 25V tantalum capacitor
Sprague 293D106X9025D2
Varactor diode
Alpha Industries SMV1204-34
2-pin headers
Ceramic coaxial resonator
Trans-Tech SR8800LPQ1357BY
Not installed
10nH inductor
Coilcraft 0603HS-10NTJBC
SMA connectors (edge mount)
10鈩? 5% resistors
1k鈩? 5% resistor
Not installed
51鈩? 5% resistor
3-pin header
MAX2620EUA
SMA connector (PC mount)
Shunt
MAX2620 circuit board
MAX2620 data sheet
______________Ordering Information
PART
MAX2620EVKIT
TEMP. RANGE
-40掳C to +85掳C
BOARD TYPE
Surface Mount
______________Component Suppliers
SUPPLIER
Alpha Industries
Coilcraft
Sprague
Trans-Tech
PHONE
(617) 935-5150
(847) 639-6400
(603) 224-1961
(301) 695-9400
FAX
(617) 824-4579
(847) 639-1469
(603) 224-1430
(301) 695-7065
_________________________Quick Start
The MAX2620 EV kit is fully assembled and factory test-
ed. Follow the instructions in the
Connections and
Setup
section.
__________Test Equipment Required
鈥?/div>
NOTE: All capacitors and resistors are size 0805 unless other-
wise noted.
Power supplies.
Low-noise power supplies are rec-
ommended for oscillator-noise measurements. This
is especially important for the tuning voltage sup-
plied to the varactor (VCONT). Noise or ripple on
the tuning voltage frequency-modulates the oscilla-
tor and causes spectral spreading. Batteries can be
used in place of power supplies, if necessary.
鈥擠C supply capable of supplying +2.7V to +5.25V
at 20mA. Alternatively, use two or three 1.5V AA
batteries.
鈥擠C supply capable of supplying 0V to +3V, con-
tinuously variable, for VCONT. Alternatively, use
two or three 1.5V batteries with a resistive volt-
age divider or potentiometer.
________________________________________________________________
Maxim Integrated Products
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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
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