General Description

The MAX2750/MAX2751/MAX2752 are self-contained volt-

age-controlled oscillators (VCOs) intended for use in the

2.4GHz to 2.5GHz ISM band. Each IC combines a fully

integrated oscillator and output buffer in a miniature 8-pin

µMAX package.

The inductor and varactor elements of the tank are inte-

grated on-chip, greatly simplifying application of the part.

The only required external components are a couple of

supply bypass capacitors. The IC provides direct connec-

tion to the VCO tuning voltage input and the VCO buffer

output. The tuning voltage input range is +0.4V to +2.4V,

and the oscillator frequency tuning range is factory adjust-

ed to provide guaranteed limits. The output signal is

buffered by an amplifier stage (internally matched to 50

Ω)

to provide higher output power and isolate the device from

load impedance variations.

The MAX2750/MAX2751/MAX2752 operate over a +2.7V

to +5.5V supply voltage range. Internal regulation of the

oscillator supply voltage eliminates the need for an exter-

nal LDO regulator for the VCO. The IC also provides a dig-

itally controlled shutdown mode to permit implementation

of sophisticated power-supply management. In shutdown,

the supply current is reduced to less than 1µA.

________________________Applications

802.11b DSSS WLAN

802.11 FHSS WLAN

Home RF

2.4GHz Bluetooth ISM Proprietary Radio

Features

o Guaranteed Frequency Tuning Range

MAX2750: 2400MHz to 2500MHz (Zero IF)

MAX2751: 2120MHz to 2260MHz

(240MHz to 280MHz IF)

MAX2752: 2025MHz to 2165MHz

(335MHz to 375MHz IF)

o On-Chip Tank Circuit

o Internally Matched Output Buffer Amplifier

o Low-Current Shutdown Mode

o +2.7V to +5.5V Supply Voltage Range

o Miniature 8-Pin µMAX Package

2.4GHz Monolithic

Voltage-Controlled Oscillators

________________________________________________________________ Maxim Integrated Products

1

OSCILLATOR

CORE

BIAS

TUNE

TUNE

BYP

SHDN

GND

OUT

GND

SHDN

OUT TO MIXER/

SYNTHESIZER

MAX2750

MAX2751

MAX2752

Typical Operating Circuit

19-1825; Rev 0; 10/00

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET

Ordering Information

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP. RANGE

PIN-PACKAGE

MAX2750EUA

-40

°C to +85°C

8 µMAX

MAX2751EUA

-40

°C to +85°C

8 µMAX

MAX2752EUA

-40

°C to +85°C

8 µMAX

Pin Configuration appears at end of data sheet.