MAX2605:45MHz to 650MHz, Integrated IF VCOs with Differential Output

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.

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
MAX2605, MAX2606, MAX2607, MAX2608, MAX2609: Typical Operating Circuit
MAX2605, MAX2606, MAX2607, MAX2608, MAX2609: Typical Operating Circuit
  • 2.4GHz ISM Band
  • 902MHz to 928MHz ISM Band
  • Cellular and PCS Mobile Phones
  • General-Purpose IF Oscillators
  • GPS Receivers
  • Land Mobile Radios
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MAX2605-MAX2609?Data SheetMAX2605-MAX2609.pdf
Part NumberLO Driver OutputsPLL Driver OutputsRF Freq.
RF Freq.
(mm x mm)
minmaxminmaxSee Notes
MAX2605YesYes4575-10-102.7 to x 2.9SOT/6$0.96 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX2605EUTNo Longer AvailableMAX2605EUT+SOT,;6 pin;9 mm?-40°C to +85°CNo
MAX2605EUT+ActiveSOT,;6 pin;9 mm?-40°C to +85°CLead Free
MAX2605EUT+TActiveSOT,;6 pin;9 mm?-40°C to +85°CLead Free
MAX2605EUT-TNo Longer AvailableMAX2605EUT+TSOT,;6 pin;9 mm?-40°C to +85°CNo
MAX2605-MAX2609.pdf MAX2609
MAX2605.pdf MAX2605
MAX2605-MAX2609.pdf MAX2609
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