MAX2754 is a self-contained, linear modulation, voltage-controlled oscillator (VCO) intended for use in the 2.4GHz to 2.5GHz ISM band, particularly for FSK modulation systems that utilize a direct frequency-modulation transmit architecture. In addition to the standard frequency tuning input, this device features a linear modulation input. The frequency tuning range of 1145MHz to 1250MHz (1/2 LO) also supports an IF up to 110MHz with low side LO. The VCO is based on Maxim's proprietary monolithic VCO technology, where all VCO components are integrated on-chip, including the varactor and inductor. The MAX2754 linear modulation input offers a means to directly FM modulate the VCO with a constant modulation sensitivity over the tuning voltage input range. Typical frequency deviation is -500kHz/V which is linear to ±4% over the guaranteed frequency limits. The tuning input voltage range is +0.4V to +2.4V and the oscillator frequency is factory adjusted to provide guaranteed limits. The oscillator signal is buffered by an output amplifier stage (internally matched to 50Ω) to provide higher output power and isolate the oscillator from load impedance variations. The MAX2754 operates over a +2.7V to +5.5V supply range. This device also provides a digitally controlled shutdown mode to permit implementation of sophisticated power-supply management. In shutdown, the supply current is reduced to 0.2µA. Even when active, power consumption is a modest 41mW.
The MAX2754 is a self‑contained, linear‑modulation voltage‑controlled oscillator intended for the 2.4 GHz‑2.5 GHz ISM band. It integrates the varactor, inductor and buffer amplifier on‑chip and is offered in a tiny 8‑pin µMAX package.
Key features include a tuning range of 1145 MHz to 1250 MHz, a modulation sensitivity of –500 kHz/V (±4 % linearity), single‑supply operation from 2.7 V to 5.5 V, and a shutdown current of only 0.2 µA. The device provides a buffered 50 Ω output and supports up to 110 MHz IF.
| Frequency tuning range | 1145 MHz – 1250 MHz |
|---|---|
| Modulation sensitivity | -500 kHz/V (±4 % linearity) |
| Supply voltage | 2.7 V – 5.5 V |
| Shutdown current | 0.2 µA |
| Active power consumption | 41 mW |
| Phase noise | -137 dBc/Hz at 4 MHz offset |
| Output power | -5 dBm |
| Modulation input voltage range | +0.4 V – +2.4 V |
The device operates from a single supply of 2.7 V to 5.5 V.
The typical modulation sensitivity is –500 kHz per volt of modulation input.
In shutdown mode the supply current drops to 0.2 µA.
The buffered output delivers about –5 dBm.