Product category:
Communications ICs (Wired)
News Release from: Analog Devices | Subject: ADF4007 and ADF4154
Edited by the Electronicstalk Editorial
Team on 10 June 2004
PLL synthesisers up the frequency
Two new PLL synthesisers deliver industry-leading performance for the up- and down-conversion of RF signals in wireless applications.
Two new PLL synthesisers deliver industry-leading performance for the up- and down-conversion of RF signals in wireless applications The ADF4007 is a fixed frequency, low noise integer-N PLL that delivers the industry's highest frequency of operation at 7.5GHz, eliminating frequency doublers in many high frequency systems, simplifying system architecture, and reducing cost
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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The ADF4007 is designed for cellular basestations and satellite radio link applications.
The ADF4154 is a fractional-N PLL and offers the best phase noise performance of -106dBc/Hz under GSM1800 conditions.
This allows greater design flexibility in meeting the overall system noise targets.
Further reading
Front-end IC cleans up transmitter designs
The ADF9010 integrates a high-performance transmitter quadrature modulator with an integer-N synthesiser and on-chip low-phase-noise voltage-controlled oscillator.
Demodulator and amp cut receiver complexity
Combined two-chip solution can reduce the active component count by 60% within a radio design, providing considerable board area and bill of material savings.
This PLL comes with a fast locking feature that improves frequency and phase settling times and a programmable modulus that can accommodate multiple system reference frequencies.
The ADF4154 is ideal for cellular base stations, private mobile radio, and instrumentation applications.
"Customers are continually seeking ways to improve performance while reducing system costs", said Christian Kermarrec, Vice President, RF and Wireless Systems, Analog Devices.
"Analog Devices has responded with the introduction of these two new PLL synthesisers which demonstrate our unrelenting commitment to innovation".
The ADF4007 frequency synthesiser is a fixed frequency (7.5GHz) integer-N PLL synthesiser that has the capability of operating to 7.5GHz on the RF side and 120MHz at the PFD (phase frequency detector).
It consists of a low noise digital PFD, a precision charge pump, and a divider/prescaler.
The divider/ prescaler value can be set by two external control pins to one of four values (8, 16, 32, or 64).
The reference divider is permanently set to 2, allowing an external reference input frequency of up to 240MHz.
The ADF4154 is a 500MHz to 4GHz fractional-N frequency synthesiser operating over the 2.7 to 3.3V range.
A separate charge pump supply allows extended tuning voltage.
Features include programmable charge pump currents and programmable dual modulus at prescalar 4/5, 8/9 with digital lock detect and power-down mode.
Software optimisation of phase noise or spurious noise is facilitated.
The ADF4154 is pin compatible with the ADF4153 and all ADI ADF41xx integer-N PLLs.
Both PLL synthesisers are available in production quantities now.
The ADF4007 is offered in a 20-pin LFCSP (lead-frame chip-scale package) and is priced at $2.78 per unit for quantities of 10,000.
The ADF4154 is offered in a 16-pin TSSOP and 20-pin LFCSP and is priced at $2.93 per unit in quantities of 10,000.
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