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MAX2605, MAX2606, MAX2607, MAX2608, MAX2609

45MHz to 650MHz, Integrated IF VCOs with Differential Output

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Active: In Production.


The MAX2605-MAX2609 are compact, high-performance intermediate-frequency (IF) voltage-controlled oscillators (VCOs) designed specifically for demanding portable wireless communication systems. They combine monolithic 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 driving 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.

Data Sheet

Download this datasheet in PDF formatDownload Rev 0a (PDF, 320kB)
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An evaluation board is available: MAX2605EVKIT, MAX2606EVKIT, MAX2607EVKIT, MAX2608EVKIT, MAX2609EVKIT

Key Features

  • Small Size
  • Integrated Varactor for Tuning
  • Low Phase Noise
  • Wide Application Frequency Range
  • Differential or Single-Ended Outputs
  • Single +2.7V to +5.5V Supply
  • Ultra-Small SOT23-6 Package
  • On-Chip Temperature-Stable Bias
  • Low-Current Operation


  • 2.4GHz ISM Band
  • 902MHz to 928MHz ISM Band
  • Cellular and PCS Mobile Phones
  • General-Purpose IF Oscillators
  • GPS Receivers
  • Land Mobile Radios

Key Specifications:

Part Number LO Driver Outputs PLL Driver Outputs RF Freq.
RF Freq.
(mm x mm)
min max min max See Notes
MAX2605  Yes Yes 45 75 -10 -10 2.7 to 5.5 1.9 2.7 x 2.9 $0.91 @1k
MAX2606  70 150 2.1
MAX2607  150 300 2.1
MAX2608  300 500 2.7
MAX2609  500 650 3.6
See All VCOs (14)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX2605, MAX2606, MAX2607, MAX2608, MAX2609: Typical Operating Circuit
Typical Operating Circuit

More Information

Topmark Coding MAX2605
Topmark Coding MAX2606
Topmark Coding MAX2607
Topmark Coding MAX2608
Topmark Coding MAX2609
New Product Press Release   2000-05-16 ]

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Document Ref.: 19-1673 Rev 0a; 2002-04-08
This page last modified: 2009-10-27