19-1673 Rev 0; 9/00
MAX2605–MAX2609 Evaluation Kits
General Description
The MAX2605–MAX2609 evaluation kits (EV kits) simplify
evaluation of this family of voltage-controlled oscillators
(VCOs). These kits enable testing of the devices’ per-
formance and require no additional support circuitry.
Both signal outputs use SMA connectors to facilitate
connection to RF test equipment.
These EV kits are fully assembled and tested. Their oscil-
lation frequencies are set to approximately the midrange
of the respective VCOs.
o
Easy Evaluation
o
Complete, Tunable VCO Test Board with Tank
Circuit
o
Low Phase Noise
o
Fully Assembled and Tested
Features
Evaluate: MAX2605–MAX2609
Ordering Information
PART
MAX2605EVKIT
MAX2606EVKIT
MAX2607EVKIT
MAX2608EVKIT
MAX2609EVKIT
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
IC PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
Component Suppliers
SUPPLIER
AVX
Coilcraft
EFJohnson
Murata
PHONE
803-946-0690
847-639-6400
402-474-4800
FAX
803-626-3123
847-639-1469
WEBSITE
avx-corp.com
coilcraft.com
murata.com
402-474-4858 efjohnson.com
814-237-1431 814-238-0490
MAX2605 Component List
DESIGNATION
QTY
DESCRIPTION
1000pF
±5%
ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
12pF
±5%
ceramic capacitors
(0603)
Murata GRM39COG120J050A
10µF
±10%,
16V tantalum capacitor
AVX TAJC106K016
270Ω
±5%
resistor (0603)
Not installed
10Ω
±5%
resistor (0603)
Not installed
680nH inductors
Coilcraft 1008CS-681XJBC
1.2µH inductor
Coilcraft 1206CS-122XJBC
MAX2605EUT
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
Test points
Digi-Key 5000K-ND
MAX2605/6/7 EV kit circuit board
MAX2605–MAX2609 data sheet
MAX2606 Component List
DESIGNATION
QTY
DESCRIPTION
1000pF
±5%
ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
4.7pF
±0.25%
ceramic
capacitors (0603)
Murata GRM39COG4R7C050A
10µF
±10%,
16V tantalum capacitor
AVX TAJC106K016
270Ω
±5%
resistor (0603)
Not installed
10Ω
±5%
resistor (0603)
Not installed
270nH
±2%
inductor
Coilcraft 1008CS-271XJBC
330nH inductor
Coilcraft 1008CS-331XJBC
MAX2606EUT
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
Test points
MAX2605/6/7 EV kit circuit board
MAX2605–MAX2609 data sheet
C1, C4
2
C1, C4
2
C2, C3
2
C2, C3
2
C5
R1
R2, R3
R4
L1, L2
L4, L5
L3
U1
J1, J2
VCC,GND,
TUNE
None
None
1
1
2
1
2
2
1
1
2
C5
R1
R2, R3
R4
L1, L2
L3
L4, L5
U1
J1, J2
VCC,GND,
TUNE
None
None
1
1
2
1
2
1
2
1
2
6
1
1
6
1
1
________________________________________________________________
Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX2605–MAX2609 Evaluation Kits
Evaluate: MAX2605–MAX2609
MAX2607 Component List
DESIGNATION
QTY
DESCRIPTION
1000pF
±5%
ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
3pF
±0.25%
ceramic capacitors
(0603)
Murata GRM39COG030C050A
10µF
±10%,
16V tantalum capacitor
AVX TAJC106K016
270Ω
±5%
resistor (0603)
Not installed
10Ω
±5%
resistor (0603)
Not installed
68nH
±2%
inductor
Coilcraft 1008CS-680XJBC
120nH inductors
Coilcraft 1008CS-121XJBC
MAX2607EUT
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
Test points
MAX2605/6/7 EV kit circuit board
MAX2605–MAX2609 data sheet
C5
R1
R2, R3
R4
L1
L4, L5
U1
J1, J2
VCC,GND,
TUNE
None
None
1
1
2
1
1
2
1
2
MAX2608 Component List
DESIGNATION
QTY
DESCRIPTION
1000pF
±5%
ceramic capacitor
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
1pF
±0.25%
ceramic capacitors
(0603)
Murata GRM39COG010C050A
100pF
±5%
ceramic capacitors
(0603)
Murata GRM39COG101J050A
10µF
±10%,
16V tantalum capacitor
AVX TAJC106K016
270Ω
±5%
resistor (0603)
Not installed
10Ω
±5%
resistor (0603)
22nH
±2%
inductor
Coilcraft 0805CS-220XGBC
68nH
±2%
inductors
Coilcraft 0805CS-680XJBC
MAX2608EUT
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
Test points
Digi-Key 5000K-ND
MAX2608/9 EV kit circuit board
MAX2605–MAX2609 data sheet
C1, C4
2
C1
1
C2, C3
2
C2, C3
2
C5
R1
R2, R3
R4
L1, L2
L3
L4, L5
U1
J1, J2
VCC,GND,
TUNE
None
None
1
1
2
1
2
1
2
1
2
C4, C6
2
6
1
1
6
1
1
Quick Start
The MAX2605–MAX2609 evaluation kits are fully
assembled and factory tested. Follow the instructions in
the
Connections and Setup
section for proper device
evaluation.
– Use a DC power supply capable of supplying
+0.4V to +2.4V, continuously variable, for TUNE.
Alternatively, use two 1.5V batteries with a resistive
voltage divider or potentiometer.
• An RF spectrum analyzer that covers the operating
frequency range of the MAX2605–MAX2609
• A 50Ω coaxial cable with SMA connectors
• An ammeter (optional)
Test Equipment Required
• Low-noise power supplies (these are recommended
for oscillator noise measurement). Noise or ripple will
frequency-modulate the oscillator and cause spectral
spreading. Batteries can be used in place of power
supplies, if necessary.
– Use a DC power supply capable of supplying
+2.7V to +5.5V. Alternatively, use two or three 1.5V
batteries.
2
Connections and Setup
1) Connect a DC supply (preset to +3V) to the V
CC
and
GND terminals (through an ammeter, if desired) on
the EV kit.
2) Turn on the DC supply. If used, the ammeter reading
_______________________________________________________________________________________
MAX2605–MAX2609 Evaluation Kits
MAX2609 Component List
DESIGNATION
QTY
DESCRIPTION
1000pF
±5%
ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
1pF
±0.25%
ceramic capacitors
(0603)
Murata GRM39COG010C050A
100pF
±5%
ceramic capacitors
(0603)
Murata GRM39COG101J050A
10µF
±10%,
16V tantalum capacitor
AVX TAJC106K016
270Ω
±5%
resistor (0603)
Not installed
10Ω
±5%
resistor (0603)
8.2nH
±2%
inductor
Coilcraft 0805CS-080XGBC
27nH
±2%
inductors
Coilcraft 0805CS-270XJBC
MAX2609EUT
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
Test points
Digi-Key 5000K-ND
MAX2608/9 EV kit circuit board
MAX2605–MAX2609 data sheet
C1
1
C2, C3
2
C4, C6
2
coupling from the supply. Also, place the VCO as far
away as possible from the noisy section of a larger sys-
tem, such as a switching regulator or digital circuits.
The VCO’s performance is strongly dependent on the
availability of the external tuning inductor. For best per-
formance, use high-Q components and choose their val-
ues carefully. To minimize the effects of parasitic ele-
ments, which degrade circuit performance, place the
tuning inductor and C
BYP
close to the VCO. For higher-
frequency versions, include the parasitic PC board
inductance and capacitance when calculating the
oscillation frequency. In addition, remove the ground
plane around and under the tuning inductor to minimize
the effect of parasitic capacitance.
Noise on TUNE translates into FM noise on the outputs;
therefore, keep the trace between TUNE and the control
circuitry as short as possible. If necessary, use an RC
filter to further suppress noise, as done on the EV kits.
Evaluate: MAX2605–MAX2609
C5
R1
R2, R3
R4
L1
L4, L5
U1
J1, J2
VCC,GND,
TUNE
None
None
1
1
2
1
1
2
1
2
6
1
1
approximates the typical operating current specified
in the MAX2605–MAX2609 data sheet.
3) Connect the VCO output (OUT+ or OUT-) to a spec-
trum analyzer with a 50Ω coaxial cable.
4) Apply a positive variable DC voltage between 0.4V
and 2.4V to TUNE.
5) Check the tuning bandwidth on the spectrum analyz-
er by varying the tuning voltage (+0.4V to +2.4V).
Layout Considerations
The EV kit PC board can serve as a guide for laying out
a board using the MAX2605–MAX2609. Generally, the
VCC pin on the PC board should have a decoupling
capacitor placed close to the IC. This minimizes noise
_______________________________________________________________________________________
3
MAX2605–MAX2609 Evaluation Kits
Evaluate: MAX2605–MAX2609
L1
OPEN
C3
1
IND
OUT+
6
OUT+
SMA
R3
OPEN
R4
10Ω
VCC
R2
OPEN
C2
3
C1
1000pF
TUNE
OUT-
4
OUT-
SMA
C4
1000pF
+
C5
10V
10µF
GND
L2
OPEN
L3
U1
2
GND
MAX2605
MAX2606
MAX2607
V
CC
5
L4
L5
R1
270Ω
TUNE
Figure 1. MAX2605/MAX2606/MAX2607 EV Kits Schematic
C3
1
IND
OUT+
6
OUT+
SMA
R3
OPEN
R4
10Ω
VCC
R2
OPEN
C2
3
C1
1000pF
TUNE
OUT-
4
OUT-
SMA
C6
100pF
C4
100pF
+
C5
10V
10µF
GND
L1
U1
2
GND
MAX2608
MAX2609
V
CC
5
L4
L5
R1
270Ω
TUNE
Figure 2. MAX2608/MAX2609 EV Kits Schematic
4
_______________________________________________________________________________________
MAX2605–MAX2609 Evaluation Kits
Evaluate: MAX2605–MAX2609
1.0"
Figure 3. MAX2605/MAX2606/MAX2607 EV Kits Component
Placement Guide—Top Silk Screen
1.0"
Figure 4. MAX2608/MAX2609 EV Kits Component Placement
Guide—Top Silk Screen
1.0"
Figure 5. MAX2605/MAX2606/MAX2607 EV Kits PC Board
Layout—Component Side
1.0"
Figure 6. MAX2608/MAX2609 EV Kits PC Board Layout—
Component Side
_______________________________________________________________________________________
5
