MAXIM MAX2605

19-1673 Rev 0; 9/00
MAX2605–MAX2609 Evaluation Kits
The MAX2605–MAX2609 evaluation kits (EV kits) simplify
evaluation of this family of voltage-controlled oscillators
(VCOs). These kits enable testing of the devices’ performance 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 oscillation frequencies are set to approximately the midrange
of the respective VCOs.
Component Suppliers
PHONE
FAX
WEBSITE
AVX
SUPPLIER
803-946-0690
803-626-3123
avx-corp.com
Coilcraft
847-639-6400
847-639-1469
coilcraft.com
EFJohnson
402-474-4800
402-474-4858 efjohnson.com
Murata
814-237-1431 814-238-0490
murata.com
Features
♦ Easy Evaluation
♦ Complete, Tunable VCO Test Board with Tank
Circuit
♦ Low Phase Noise
♦ Fully Assembled and Tested
Ordering Information
TEMP. RANGE
IC PACKAGE
MAX2605EVKIT
PART
-40°C to +85°C
6 SOT23-6
MAX2606EVKIT
-40°C to +85°C
6 SOT23-6
MAX2607EVKIT
-40°C to +85°C
6 SOT23-6
MAX2608EVKIT
-40°C to +85°C
6 SOT23-6
MAX2609EVKIT
-40°C to +85°C
6 SOT23-6
MAX2605 Component List
DESIGNATION
QTY
DESCRIPTION
C1, C4
2
1000pF ±5% ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
C2, C3
2
12pF ±5% ceramic capacitors
(0603)
Murata GRM39COG120J050A
C5
1
10µF ±10%, 16V tantalum capacitor
AVX TAJC106K016
R1
1
270Ω ±5% resistor (0603)
R2, R3
2
Not installed
MAX2606 Component List
DESIGNATION
QTY
DESCRIPTION
C1, C4
2
1000pF ±5% ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
C2, C3
2
4.7pF ±0.25% ceramic
capacitors (0603)
Murata GRM39COG4R7C050A
C5
1
10µF ±10%, 16V tantalum capacitor
AVX TAJC106K016
R1
1
270Ω ±5% resistor (0603)
R2, R3
2
Not installed
R4
1
10Ω ±5% resistor (0603)
L1, L2
2
Not installed
680nH inductors
Coilcraft 1008CS-681XJBC
L3
1
270nH ±2% inductor
Coilcraft 1008CS-271XJBC
1
1.2µH inductor
Coilcraft 1206CS-122XJBC
L4, L5
2
330nH inductor
Coilcraft 1008CS-331XJBC
U1
1
MAX2605EUT
U1
1
MAX2606EUT
J1, J2
2
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
J1, J2
2
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
VCC,GND,
TUNE
6
Test points
Digi-Key 5000K-ND
VCC,GND,
TUNE
6
Test points
None
1
MAX2605/6/7 EV kit circuit board
None
1
MAX2605/6/7 EV kit circuit board
None
1
MAX2605–MAX2609 data sheet
None
1
MAX2605–MAX2609 data sheet
R4
1
10Ω ±5% resistor (0603)
L1, L2
2
Not installed
L4, L5
2
L3
________________________________________________________________ Maxim Integrated Products
1
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For small orders, phone 1-800-835-8769.
Evaluate: MAX2605–MAX2609
General Description
MAX2605–MAX2609 Evaluation Kits
Evaluate: MAX2605–MAX2609
MAX2607 Component List
DESIGNATION
QTY
DESCRIPTION
C1, C4
2
1000pF ±5% ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
C2, C3
2
3pF ±0.25% ceramic capacitors
(0603)
Murata GRM39COG030C050A
C5
1
10µF ±10%, 16V tantalum capacitor
AVX TAJC106K016
R1
1
270Ω ±5% resistor (0603)
R2, R3
2
Not installed
R4
1
10Ω ±5% resistor (0603)
L1, L2
2
Not installed
1
68nH ±2% inductor
Coilcraft 1008CS-680XJBC
L4, L5
2
120nH inductors
Coilcraft 1008CS-121XJBC
U1
1
MAX2607EUT
2
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
L3
J1, J2
VCC,GND,
TUNE
6
Test points
None
1
MAX2605/6/7 EV kit circuit board
None
1
MAX2605–MAX2609 data sheet
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.
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
MAX2608 Component List
DESIGNATION
QTY
DESCRIPTION
C1
1
1000pF ±5% ceramic capacitor
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
C2, C3
2
1pF ±0.25% ceramic capacitors
(0603)
Murata GRM39COG010C050A
C4, C6
2
100pF ±5% ceramic capacitors
(0603)
Murata GRM39COG101J050A
C5
1
10µF ±10%, 16V tantalum capacitor
AVX TAJC106K016
R1
1
270Ω ±5% resistor (0603)
R2, R3
2
Not installed
R4
1
10Ω ±5% resistor (0603)
L1
1
22nH ±2% inductor
Coilcraft 0805CS-220XGBC
L4, L5
2
68nH ±2% inductors
Coilcraft 0805CS-680XJBC
U1
1
MAX2608EUT
J1, J2
2
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
VCC,GND,
TUNE
6
Test points
Digi-Key 5000K-ND
None
1
MAX2608/9 EV kit circuit board
None
1
MAX2605–MAX2609 data sheet
– 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)
Connections and Setup
1) Connect a DC supply (preset to +3V) to the VCC 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
DESIGNATION
QTY
DESCRIPTION
C1
1
1000pF ±5% ceramic capacitors
(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A
C2, C3
2
1pF ±0.25% ceramic capacitors
(0603)
Murata GRM39COG010C050A
C4, C6
2
100pF ±5% ceramic capacitors
(0603)
Murata GRM39COG101J050A
C5
1
10µF ±10%, 16V tantalum capacitor
AVX TAJC106K016
270Ω ±5% resistor (0603)
R1
1
R2, R3
2
Not installed
R4
1
10Ω ±5% resistor (0603)
L1
1
8.2nH ±2% inductor
Coilcraft 0805CS-080XGBC
L4, L5
2
27nH ±2% inductors
Coilcraft 0805CS-270XJBC
U1
1
MAX2609EUT
J1, J2
2
SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND
VCC,GND,
TUNE
6
Test points
Digi-Key 5000K-ND
None
1
MAX2608/9 EV kit circuit board
None
1
MAX2605–MAX2609 data sheet
coupling from the supply. Also, place the VCO as far
away as possible from the noisy section of a larger system, 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 performance, use high-Q components and choose their values carefully. To minimize the effects of parasitic elements, which degrade circuit performance, place the
tuning inductor and CBYP close to the VCO. For higherfrequency 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.
approximates the typical operating current specified
in the MAX2605–MAX2609 data sheet.
3) Connect the VCO output (OUT+ or OUT-) to a spectrum 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 analyzer 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
Evaluate: MAX2605–MAX2609
MAX2609 Component List
Evaluate: MAX2605–MAX2609
MAX2605–MAX2609 Evaluation Kits
L1
OPEN
L2
OPEN
C3
1
IND
OUT+
OUT+
SMA
6
R3
OPEN
L4
L3
U1
2
GND
MAX2605
MAX2606
MAX2607
VCC
R4
10Ω
5
VCC
R2
OPEN
L5
R1
270Ω
C4
1000pF
+
C5
10V
10µF
GND
C2
3
TUNE
TUNE
OUT-
4
OUTSMA
C1
1000pF
Figure 1. MAX2605/MAX2606/MAX2607 EV Kits Schematic
C3
1
IND
OUT+
OUT+
SMA
6
L4
L1
R3
OPEN
U1
2
GND
MAX2608
MAX2609
VCC
R4
10Ω
5
VCC
L5
R1
270Ω
TUNE
R2
OPEN
C6
100pF
C4
100pF
+
GND
C2
3
TUNE
OUT-
4
OUTSMA
C1
1000pF
Figure 2. MAX2608/MAX2609 EV Kits Schematic
4
C5
10V
10µF
_______________________________________________________________________________________
MAX2605–MAX2609 Evaluation Kits
Evaluate: MAX2605–MAX2609
1.0"
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
Figure 6. MAX2608/MAX2609 EV Kits PC Board Layout—
Component Side
_______________________________________________________________________________________
5
Evaluate: MAX2605–MAX2609
MAX2605–MAX2609 Evaluation Kits
1.0"
Figure 7. MAX2605/MAX2606/MAX2607/MAX2608/MAX2609
EV Kits PC Board Layout—Ground Plane
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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is a registered trademark of Maxim Integrated Products.