Monolithic Voltage Controlled Oscillators

 

Part Number	Replacement	Explanation

Description

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The MAX2622/MAX2623/MAX2624 self-contained voltage-controlled oscillators (VCOs) combine an integrated oscillator and output buffer in a miniature 8-pin µMAX® package.

The inductor and varactor elements of the tank circuits are integrated on-chip, greatly simplifying application of the part. In addition, the center frequency of oscillation and frequency span are factory preset to provide a guaranteed frequency range versus control voltage. An external tuning voltage controls the oscillation frequency. The output signals are buffered by an amplifier stage (easily matched to 50Ω), using only capacitors to provide higher output power and isolate the devices from load impedance variations.

The MAX2622/MAX2623/MAX2624 operate from a +2.7V to +3.3V supply voltage and require only 9mA of supply current. In shutdown mode, the supply current is reduced to 0.1µA.

MAX2622, MAX2623, MAX2624: Typical Operating Circuit Enlarge+

Key Features

• Fully Monolithic
• Guaranteed Performance
• On-Chip 50Ω Output Match
• Wide Choice of Frequencies
  • 855MHz to 881MHz (MAX2622)
  • 885MHz to 950MHz (MAX2623)
  • 947MHz to 998MHz (MAX2624)
• +2.7V to +3.3V Single-Supply Operation
• Low-Current Shutdown Mode
• Smaller than Modules (8-pin µMAX package)

Applications/Uses

• 866MHz to 868MHz European ISM Band (MAX2622)
• 902MHz to 928MHz ISM Band, ±10.7MHz IF (MAX2623)
• 902MHz to 928MHz ISM Band, 45MHz to 70MHz IF (MAX2624)
• DECT 1/2 Frequency LO (MAX2623)