Features and Benefits
- 3.0 GHz fractional-N/1.2 GHz integer-N
- 2.7 V to 3.3 V power supply
- Separate VP allows extended tuning voltage to 5 V
- Programmable dual modulus prescaler
- RF: 4/5, 8/9
- IF: 8/9, 16/17, 32/33, 64/65
- Programmable charge pump currents
- 3-wire serial interface
- Digital lock detect
- Power-down mode
- Programmable modulus on fractional-N synthesizer
- Trade off noise vs. spurious performance
The ADF4252 is a dual fractional-N/integer-N frequency synthesizer that can be used to implement local oscillators (LO) in the upconversion and downconversion sections of wireless receivers and transmitters. Both the RF and IF synthesizers consist of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. The RF synthesizer has a Σ-Δ-based fractional interpolator that allows programmable fractional-N division. The IF synthesizer has programmable integer-N counters. A complete phase-locked loop (PLL) can be implemented if the synthesizer is used with an external loop filter and voltage controlled oscillator (VCO).
Control of all the on-chip registers is via a simple 3-wire interface. The device operates with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use.
- Base stations for mobile radio (GSM, PCS, DCS, CDMA, WCDMA)
- Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
- Wireless LANs
- Communications test equipment
- CATV equipment
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
This page contains ordering information for the evaluation board used to evaluate the ADF4252 Lowest Phase Noise PLL Synthesizer using Fractional-N Technology.
Documentation & Resources
Analog Microcontroller Forms Heart of Low-Cost, High-Efficiency PA Monitor3/1/2009 Analog Dialogue
Ask the Applications Engineer—30: PLL Synthesizers5/1/2002 Analog Dialogue
Phase-Locked Loops for High-Frequency Receivers and Transmitters - Part 37/1/1999 Analog Dialogue
Phase-Locked Loops for High-Frequency Receivers and Transmitters - Part 25/1/1999 Analog Dialogue
Phase-Locked Loops for High-Frequency Receivers and Transmitters - Part 13/1/1999 Analog Dialogue
Software & Systems Requirements
Tools & Simulations
ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
ADF4252 Companion Parts
Recommended Linear Regulators
- For a step up, 3V to 5V regulator: ADP1613.
- For ultralow noise, 3V applications,150 mA output: ADP150.
- For ultalow noise, 3V applications, 200 mA output: ADP151.
- For high accuracy, 5V applications: ADP3334.
Recommended Divide-by-4 Prescaler
- For a low noise, low power, fixed RF block: ADF5001.
Recommended PLL Active Filter
- For an ultralow noise, rail-to-rail amplifier: OP184.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.