The MAX2750AUA is a self-contained voltage-controlled
oscillator (VCO) intended for use over the 2370MHz
to 2470MHz frequency range. The IC combines a fully
integrated oscillator and output buffer in a miniature 8-pin
µMAX® package.
The inductor and varactor elements of the tank are integrated
on-chip, greatly simplifying application of the part.
The only required external components are a couple of
supply bypass capacitors. The IC provides direct connection
to the VCO tuning voltage input and the VCO buffer
output. The tuning voltage input range is +0.4V to +2.4V,
and the oscillator frequency tuning range is factory adjusted
to provide guaranteed limits. The output signal is
buffered by an amplifier stage (internally matched to 50Ω)
to provide higher output power and isolate the device from
load impedance variations.
The MAX2750AUA operates over a +2.7V to +5.5V supply
voltage range. Internal regulation of the oscillator supply
voltage eliminates the need for an external LDO
regulator for the VCO. The IC also provides a digitally controlled
shutdown mode to permit implementation of
sophisticated power-supply management. In shutdown,
the supply current is reduced to less than 2µA.
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