General Description

The MAX2605MAX2609 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.

Features

o Easy Evaluation
o Complete, Tunable VCO Test Board with Tank

Circuit

o Low Phase Noise
o Fully Assembled and Tested

Evaluate: MAX2605MAX2609

MAX2605MAX2609 Evaluation Kits

________________________________________________________________ Maxim Integrated Products

19-1673 Rev 0; 9/00

PART

MAX2605EVKIT

MAX2606EVKIT

-40°C to +85°C

TEMP. RANGE

IC PACKAGE

6 SOT23-6

Ordering Information

MAX2607EVKIT

MAX2608EVKIT

-40°C to +85°C

6 SOT23-6

SUPPLIER

PHONE

FAX

AVX

803-946-0690

803-626-3123

Coilcraft

847-639-6400

847-639-1469

EFJohnson

402-474-4800

402-474-4858

WEBSITE

avx-corp.com

coilcraft.com

efjohnson.com

Component Suppliers

MAX2609EVKIT

-40°C to +85°C

6 SOT23-6

Murata

814-237-1431

814-238-0490

murata.com

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.

D ESIG N A T IO N

QTY

DESCRIPTION

C1, C4

1000pF

±5% ceramic capacitors

(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A

C2, C3

12pF

±5% ceramic capacitors

(0603)
Murata GRM39COG120J050A

µF ±10%, 16V tantalum cap aci tor

AVX TAJC106K016

270

±5% resistor (0603)

R2, R3

Not installed

±5% resistor (0603)

L1, L2

Not installed

L4, L5

680nH inductors
Coilcraft 1008CS-681XJBC

1.2

µH inductor

Coilcraft 1206CS-122XJBC

MAX2605EUT

J1, J2

SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND

VCC,GND,

TUNE

Test points
Digi-Key 5000K-ND

None

MAX2605/6/7 EV kit circuit board

None

MAX2605MAX2609 data sheet

MAX2606 Component List

D ESIGNA T ION

QTY

DESCRIPTION

C1, C4

1000pF

±5% ceramic capacitors

(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A

C2, C3

4.7pF

±0.25% ceramic

capacitors (0603)
Murata GRM39COG4R7C050A

µF ±10%, 16V tantalum cap aci tor

AVX TAJC106K016

270

±5% resistor (0603)

R2, R3

Not installed

±5% resistor (0603)

L1, L2

Not installed

270nH

±2% inductor

Coilcraft 1008CS-271XJBC

L4, L5

330nH inductor
Coilcraft 1008CS-331XJBC

MAX2606EUT

J1, J2

SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND

VCC,GND,

TUNE

Test points

None

MAX2605/6/7 EV kit circuit board

None

MAX2605MAX2609 data sheet

MAX2605 Component List

Evaluate: MAX2605MAX2609

MAX2605MAX2609 Evaluation Kits

_______________________________________________________________________________________

Quick Start

The MAX2605MAX2609 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.

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 MAX2605MAX2609

· A 50

coaxial cable with SMA connectors

· An ammeter (optional)

Connections and Setup

1) Connect a DC supply (preset to +3V) to the V

and

GND terminals (through an ammeter, if desired) on
the EV kit.

2) Turn on the DC supply. If used, the ammeter reading

MAX2607 Component List

D ESIG N A T IO N

QTY

DESCRIPTION

C1, C4

1000pF

±5% ceramic capacitors

(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A

C2, C3

3pF

±0.25% ceramic capacitors

(0603)
Murata GRM39COG030C050A

µF ±10%, 16V tantalum cap aci tor

AVX TAJC106K016

270

±5% resistor (0603)

R2, R3

Not installed

±5% resistor (0603)

L1, L2

Not installed

68nH

±2% inductor

Coilcraft 1008CS-680XJBC

L4, L5

120nH inductors
Coilcraft 1008CS-121XJBC

MAX2607EUT

J1, J2

SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND

VCC,GND,

TUNE

Test points

None

MAX2605/6/7 EV kit circuit board

None

MAX2605MAX2609 data sheet

MAX2608 Component List

D ESIG N A T IO N

QTY

DESCRIPTION

1000pF

±5% ceramic capacitor

(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A

C2, C3

1pF

±0.25% ceramic capacitors

(0603)
Murata GRM39COG010C050A

C4, C6

100pF

±5% ceramic capacitors

(0603)
Murata GRM39COG101J050A

µF ±10%, 16V tantalum cap aci tor

AVX TAJC106K016

270

±5% resistor (0603)

R2, R3

Not installed

±5% resistor (0603)

22nH

±2% inductor

Coilcraft 0805CS-220XGBC

L4, L5

68nH

±2% inductors

Coilcraft 0805CS-680XJBC

MAX2608EUT

J1, J2

SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND

VCC,GND,

TUNE

Test points
Digi-Key 5000K-ND

None

MAX2608/9 EV kit circuit board

None

MAX2605MAX2609 data sheet

Evaluate: MAX2605MAX2609

MAX2605MAX2609 Evaluation Kits

_______________________________________________________________________________________

approximates the typical operating current specified
in the MAX2605MAX2609 data sheet.

3) Connect the VCO output (OUT+ or OUT-) to a spec-

trum analyzer with a 50

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 MAX2605MAX2609. Generally, the
VCC pin on the PC board should have a decoupling
capacitor placed close to the IC. This minimizes noise

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.

MAX2609 Component List

D ESIG N A T IO N

QTY

DESCRIPTION

1000pF

±5% ceramic capacitors

(0603)
Murata GRM39COH102J025A or
AVX 06035A102JAT2A

C2, C3

1pF

±0.25% ceramic capacitors

(0603)
Murata GRM39COG010C050A

C4, C6

100pF

±5% ceramic capacitors

(0603)
Murata GRM39COG101J050A

µF ±10%, 16V tantalum cap aci tor

AVX TAJC106K016

270

±5% resistor (0603)

R2, R3

Not installed

±5% resistor (0603)

8.2nH

±2% inductor

Coilcraft 0805CS-080XGBC

L4, L5

27nH

±2% inductors

Coilcraft 0805CS-270XJBC

MAX2609EUT

J1, J2

SMA connectors (edge mount)
EFJohnson 142-0701-801 or
Digi-Key J502-ND

VCC,GND,

TUNE

Test points
Digi-Key 5000K-ND

None

MAX2608/9 EV kit circuit board

None

MAX2605MAX2609 data sheet

Evaluate: MAX2605MAX2609

MAX2605MAX2609 Evaluation Kits

_______________________________________________________________________________________

Figure 2. MAX2608/MAX2609 EV Kits Schematic

GND

TUNE

OUT-

GND

IND

OUT+

C1
1000pF

270

OUT-
SMA

OUT+
SMA

C5
10V
10

µF

C4
100pF

C6
100pF

VCC

MAX2608
MAX2609

R3
OPEN

R2
OPEN

Figure 1. MAX2605/MAX2606/MAX2607 EV Kits Schematic

GND

TUNE

OUT-

GND

IND

OUT+

C1
1000pF

270

R3
OPEN

R2
OPEN

OPEN

OUT-
SMA

OUT+
SMA

C5
10V
10

µF

C4
1000pF

VCC

MAX2605
MAX2606
MAX2607

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.

6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Printed USA

is a registered trademark of Maxim Integrated Products.

Evaluate: MAX2605MAX2609

MAX2605MAX2609 Evaluation Kits

Figure 7. MAX2605/MAX2606/MAX2607/MAX2608/MAX2609
EV Kits PC Board Layout--Ground Plane

1.0"

Part Number MAX2609EVKIT