Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: ADF4252
Edited by the Electronicstalk Editorial
Team on 07 June 2002
Synthesiser keeps wireless systems quiet
The ADF4252 is a novel PLL synthesiser that creates state-of-the-art local oscillators for the up- and down-conversion of RF signals in wireless applications.
The ADF4252 is a novel PLL synthesiser that creates state-of-the-art local oscillators for the up- and down-conversion of RF signals in wireless applications The RF synthesiser has a sigma-delta-based interpolator that allows programmable fractional-N division, which ensures superior phase noise and minimises spurs
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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Sigma-delta ADC achieves greater than true 16bit noise-free resolution up to 2.4kHz across all input voltages from 40mV to 5V.
The IF synthesiser has programmable integer-N counters.
The ADF4252 PLL consists of a low noise digital phase frequency detector (PFD), a precision charge pump, along with a programmable fractional modulus, whose flexibility guarantees that exact output frequencies can be synthesised.
The ADF4252 operates on a 2.7 to 3.3V power supply with separate Vp, allowing extended tuning voltage to 5V.
Additional features include three-wire serial interface with 1.8V logic compatibility and eight levels of programmable charge pump currents.
It also allows 250MHz REFin frequencies and supports PFD frequencies up to 30MHz, which allows faster settling and lower phase noise.
The ADF4252 is supported on the ADIsimPLL software design tool.
The ADF4252 is available now in a 4 x 4mm chip-scale package at a cost of $4.93 per unit in 1000 piece quantities.
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