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

 

Part Number	Replacement	Explanation

Description

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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.

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

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

Applications/Uses

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