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.
The MAX2605–MAX2609 family provides high‑performance intermediate‑frequency VCOs in a tiny 6‑pin SOT23‑6 package. They integrate a varactor and feedback capacitors, requiring only an external inductor to set the oscillation frequency. An on‑chip differential output buffer delivers up to –8 dBm (differential) and isolates the load from impedance variations.
These devices operate from a single +2.7 V to +5.5 V supply, consume low current, and are specified for –40 °C to +85 °C operation. The series covers a wide frequency span of 45 MHz to 650 MHz, making them suitable for portable wireless, cellular, PCS, GPS, and other IF applications.
| Frequency range | 45 MHz – 650 MHz |
|---|---|
| Supply voltage | +2.7 V to +5.5 V |
| Supply current (typical) | 2.1 mA (MAX2605), 2.7 mA (MAX2606/2607), 3.6 mA (MAX2609) |
| Maximum differential output power | -8 dBm (differential) |
| Operating temperature range | -40 °C to +85 °C |
The devices operate from a single +2.7 V to +5.5 V supply.
They cover a frequency range from 45 MHz up to 650 MHz.
The integrated differential output buffer can deliver up to –8 dBm (differential).