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ADF4157 High Resolution 6 GHz Fractional-N Frequency Synthesizer

The ADF4157 is a 6 GHz fractional-N frequency synthesizer with a 25-bit fixed modulus, allowing subhertz frequency resolution at 6 GHz. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. There is a Σ-Δ based fractional interpolator to allow programmable fractional-N division. The INT and FRAC values define an overall N divider, N = INT + (FRAC/225). The ADF4157 features cycle slip reduction circuitry, which leads to faster lock times without the need for modifications to the loop filter.

Control of all 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.

Applications

• Satellite communications terminals, radar equipment
• Instrumentation equipment
• Personal mobile radio (PMR)
• Base stations for mobile radio
• Wireless handsets

Data Sheets

Application Notes

User Guides

Frequently Asked Questions

Order Information

Evaluation Boards

Reference Materials

• Product Selection Guide：RF Source Booklet