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EVALUATION KIT AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX2605–MAX2609 are compact, high-performance

intermediate-frequency (IF) voltage-controlled oscillators

(VCOs) designed specifically for demanding portable

wireless communication systems. They combine monolith-

ic construction with low-noise, low-power operation in a

tiny 6-pin SOT23 package.

These low-noise VCOs feature an on-chip varactor and

feedback capacitors that eliminate the need for external

tuning elements, making the MAX2605–MAX2609 ideal

for portable systems. Only an external inductor is

required to set the oscillation frequency. In addition, an

integrated differential output buffer is provided for dri-

ving a mixer or prescaler. The buffer output is capable

of supplying up to -8dBm (differential) with a simple

power match. It also provides isolation from load

impedance variations.

The MAX2605–MAX2609 operate from a single +2.7V to

+5.5V supply and offer low current consumption. These IF

oscillators can cover the 45MHz to 650MHz frequency

range.

Applications

Cellular and PCS Mobile Phones

2.4GHz ISM Band

902MHz to 928MHz ISM Band

Land Mobile Radio

GPS Receivers

General-Purpose IF Oscillators

Features

o Small Size

o Integrated Varactor for Tuning

o Low Phase Noise

o Wide Application Frequency Range

o Differential or Single-Ended Outputs

o Single +2.7V to +5.5V Supply

o Ultra-Small SOT23-6 Package

o On-Chip Temperature-Stable Bias

o Low-Current Operation

45MHz to 650MHz, Integrated IF

VCOs with Differential Output

GND

OUT-

TUNE

16

OUT+

5

IND

MAX2605

MAX2606

MAX2607

MAX2608

MAX2609

SOT23-6

TOP VIEW

2

34

19-1673; Rev 0a; 4/02

Pin Configuration/

Functional Diagram

Ordering Information

PART

MAX2605

MAX2606

MAX2607

150 to 300

70 to 150

45 to 70

FREQUENCY

RANGE

(MHz)

SUPPLY

CURRENT

(mA)

1.9

2.1

2.1

MAX2608

300 to 500

2.7

PHASE

NOISE

(dBc/Hz)

-117

-112

-107

-100

MAX2609

500 to 650

3.6

-93

Selector Guide

AABE

6 SOT23-6

-40°C to +85°C

MAX2608EUT-T

AABD

AABC

AABB

TOP

MARK

6 SOT23-6

6 SOT23-6

6 SOT23-6

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX2607EUT-T

MAX2606EUT-T

MAX2605EUT-T

PART

AABF

6 SOT23-6

-40°C to +85°C

MAX2609EUT-T

MAX2605–MAX2609