New Analog Devices’ PLL Synthesisers Deliver Utmost Flexibility and Phase Noise Performance

With an RF bandwidth of 3.5 GHz, the ADF4151 allows implementation of a Fractional-N or Integer-N PLL synthesiser. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider and is pin-and software-compatible with ADI’s widely-used ADF4350 4.4 GHz PLL. When these two PLLs are used together, the ADF4151 facilitates the use of an external voltage controlled oscillator (VCO) and greatly improves phase noise without significant board revisions.
ADF4151 Fractional-N/Integer-N PLL Synthesiser Key Features:
• 3 to 3.6 V power supply
• 1.8 V logic compatibility
• Separate charge pump supply allows extended tuning voltage (up to 5 V) in 3 V systems
• Programmable dual-modulus prescaler of 4/5 or 8/9
• Programmable RF output phase
• 3-wire serial interface

The ADF4196 is an ultra-fast settling 6 GHz fractional-N PLL that has been specifically designed to meet the GSM/EDGE lock time requirements for communications infrastructure and pulse Doppler radar applications. When used in conjunction with an external loop filter and VCO, the ADF4196 PLL can achieve lock times of less than 5 µs. It consists of a low noise, digital phase frequency detector (PFD) and a precision differential charge pump.

ADF4196 Fractional-N PLL Synthesiser Key Features:
• Frequency hop across GSM band in 5 µs with phase settled within 20 µs
• 1◦ rms phase error at 4 GHz RF output
• Digitally programmable output phase
• 3-wire serial interface
• On-chip, low noise differential amplifier
• Phase noise figure of merit: 216 dBc/Hz

The ADF4151 and ADF4196 PLLs are supported by a new version of ADIsimPLL,™ a comprehensive PLL synthesiser design and simulation tool. Also announced today, ADIsimPLL Version 3.41 adds support for ADI’s latest PLLs and includes several functionality enhancements.

The ADF4151 PLL synthesiser is well-suited to work with ADI’s ADL5801 and ADL5802 RF mixers and is complementary to the ADF4350 and ADF4351 PLL synthesisers. The ADF4196 works well with the ADL5375 modulator and is complementary to the ADF4193 PLL synthesiser.

ADI’s RF IC Portfolio Covers Entire RF Signal Chain
Using a unique combination of design skills, system understanding and process technologies, Analog Devices offers the broadest portfolio of RF ICs covering the entire RF signal chain from industry-leading high-performance RF function blocks to highly integrated short-range and 3G/4G single-chip transceiver solutions. The RF function blocks include PLL, integrated PLL/VCO and DDS synthesisers; TruPwr™ RMS power detectors and logarithmic amplifiers; variable gain amplifiers; power amplifiers, low noise amplifiers and other amplifiers; RF mixers and direct conversion modulator and demodulator products. These products are supported by a wide range of design resources to ease the development of RF systems, including free design tools, Circuits from the Lab™ reference circuits and the EngineerZone™ technical forums.