8 GHz integer-N PLL
The ADF4108 frequency synthesizer can be used to implement local oscillators in the up-conversion and down-conversion sections of wireless receivers and transmitters. It consists of a low-noise digital PFD (phase frequency detector), a precision charge pump, a programmable reference divider, programmable A and B counters, and a dual-modulus prescaler (P/P + 1). The A (6-bit) and B (13-bit) counters, in conjunction with the dual-modulus prescaler (P/P + 1), implement an N divider (N = BP + A). In addition, the 14-bit reference counter (R counter), allows selectable REFIN frequencies at the PFD input. A complete PLL (phase-locked loop) can be implemented if the synthesizer is used with an external loop filter and VCO (voltage controlled oscillator). Its very high bandwidth (8GHz) means that frequency doublers or prescalers can be eliminated in many high frequency systems, simplifying system architecture and reducing cost.
- Broadband wireless access
- Satellite systems
- Wireless LANs
- Base stations for wireless radio
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The EV-ADF4108EB1Z evaluation board allows the user to evaluate the performance of the ADF4108 frequency synthesizer for phase-locked loops (PLLs). The board contains the ADF4108 synthesizer, an SMA connector for the reference input, the power supplies, a USB interface, and the RF outputs. There is also an active loop filter and a VCO on board. The user has the option of using an alternate loop filter and VCO by connecting the board to the following SMA connectors: VTUNE and CPOUT. The evaluation kit contains software that is compatible with Windows® XP and more recent versions to allow easy programming of the synthesizer.
The USB interface allows software programming of the ADF4108 device. A USB cable is included in the evaluation board kit to allow software programmability.
Recommended Linear Regulators
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.
Product Selection Guide
RF, Microwave, and Millimeter Wave IC Selection Guide 2017
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