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MAX2620E_D

10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs

Maxim Integrated 

19-1248; Rev 2; 2/02

EVAALVUAAILTAIOBNLEKIT

10MHz to 1050MHz Integrated

RF Oscillator with Buffered Outputs

_________________General Description

The MAX2620 combines a low-noise oscillator with two

output buffers in a low-cost, plastic surface-mount,

ultra-small µMAX package. This device integrates func-

tions typically achieved with discrete components. The

oscillator exhibits low-phase noise when properly

mated with an external varactor-tuned resonant tank

circuit. Two buffered outputs are provided for driving

mixers or prescalers. The buffers provide load isolation

to the oscillator and prevent frequency pulling due to

load-impedance changes. Power consumption is typi-

cally just 27mW in operating mode (VCC = 3.0V), and

drops to less than 0.3µW in standby mode. The MAX2620

operates from a single +2.7V to +5.25V supply.

________________________Applications

Analog Cellular Phones

Digital Cellular Phones

900MHz Cordless Phones

900MHz ISM-Band Applications

Land Mobile Radio

Narrowband PCS (NPCS)

____________________________Features

♦ Low-Phase-Noise Oscillator: -110dBc/Hz

(25kHz offset from carrier) Attainable

♦ Operates from Single +2.7V to +5.25V Supply

♦ Low-Cost Silicon Bipolar Design

♦ Two Output Buffers Provide Load Isolation

♦ Insensitive to Supply Variations

♦ Low, 27mW Power Consumption (VCC = 3.0V)

♦ Low-Current Shutdown Mode: 0.1µA (typ)

_______________Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX2620EUA

-40°C to +85°C

8 µMAX

MAX2620E/D

-40°C to +85°C

Dice*

*Dice are tested at TA = +25°C, DC parameters only.

Pin Configuration appears at end of data sheet.

____________________________________________________Typical Operating Circuit

VCC

10Ω

VTUNE

1kΩ

D1

ALPHA

SMV1204-34

C17

1.5pF

1000pF

C5

1.5pF

CERAMIC

C6

RESONATOR

L1

C3

2.7pF

C4

1pF

1 VCC1

2 TANK

3 FDBK

MAX2620

4 SHDN BIAS

SUPPLY

SHDN

VCC

10nH

OUT 8

VCC2 7

GND 6

OUT 5

1000pF

1.5pF

VCC

0.1µF

1000pF

OUT TO MIXER

OUT TO SYNTHESIZER

1000pF

51Ω

VCC

900MHz BAND OSCILLATOR

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

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

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