19-1248; Rev 1; 5/98
MAX2 6 2 0 Eva lu a t io n Kit
Evluates:MAX620
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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
50Ω 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.
♦ Complete, Tunable VCO Test Board with Tank
Circuit
♦ Tuning in 900MHz Frequency Range
♦ Low Phase Noise (-110dBc/Hz typical at 25kHz
offset from carrier)
♦ Operates from Single +2.7V to +5.25V Supply
♦ Two Output Buffers with 50Ω SMA Connectors
♦ Low-Power Shutdown Mode
____________________Co m p o n e n t Lis t
♦ Test Port for Oscillator Tank Port Characterization
♦ Fully Assembled and Tested
DESIGNATION QTY
DESCRIPTION
C1, C7–C10,
6
1000pF, 10% ceramic capacitors
C12
______________Ord e rin g In fo rm a t io n
C2, C11, C14
C3
0
1
2
3
Not installed
PART
TEMP. RANGE
BOARD TYPE
2.7pF, 10% ceramic capacitor
1pF, 10% ceramic capacitors
1.5pF, 10% ceramic capacitors
MAX2620EVKIT
-40°C to +85°C
Surface Mount
C4, C6
C5, C13, C17
______________Co m p o n e n t S u p p lie rs
10µF, ±10%, 25V tantalum capacitor
Sprague 293D106X9025D2
C15
D1
1
1
3
SUPPLIER
Alpha Industries
Coilcraft
PHONE
FAX
(617) 935-5150
(847) 639-6400
(603) 224-1961
(301) 695-9400
(617) 824-4579
(847) 639-1469
(603) 224-1430
(301) 695-7065
Varactor diode
Alpha Industries SMV1204-34
Sprague
JU1, V
,
CC
2-pin headers
GND
Trans-Tech
Ceramic coaxial resonator
Trans-Tech SR8800LPQ1357BY
L1
1
0
1
_________________________Qu ic k S t a rt
The MAX2620 EV kit is fully assembled and factory test-
e d . Follow the ins truc tions in the Conne c tions a nd
Setup section.
L4
Not installed
10nH inductor
Coilcraft 0603HS-10NTJBC
L3
OUT, OUT,
TEST PORT
3
SMA connectors (edge mount)
__________Te s t Eq u ip m e n t Re q u ire d
•
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.
R1, R3
R2
2
1
0
1
1
1
1
1
1
1
10Ω, 5% resistors
1kΩ, 5% resistor
Not installed
R4
R5
51Ω, 5% resistor
3-pin header
SHDN
U1
MAX2620EUA
—DC supply capable of supplying +2.7V to +5.25V
at 20mA. Alternatively, use two or three 1.5V AA
batteries.
VCONT
None
None
None
SMA connector (PC mount)
Shunt
—DC 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.
MAX2620 circuit board
MAX2620 data sheet
NOTE: All capacitors and resistors are size 0805 unless other-
wise noted.
________________________________________________________________ Maxim Integrated Products
1
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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