8 GHz, 19-Bit Fractional-N PLL

The ADH704S has been designed for the best phase noise and lowest spurious content possible in an integrated synthesizer. Fabricated in a SiGe BiCMOS process, this Fractional-N frequency synthesizer consists of a very low noise digital phase detector, VCO divider, reference divider and a precision-controlled charge pump. Ultra-low in-close phase noise and low spurious allows wide loop bandwidths for faster frequency hopping and low micro-phonics. Exact frequency mode with 24-bit fractional modulator provides the ability to generate fractional frequencies with zero frequency error, an important feature for Digital Pre-Distortion systems. The serial interface offers read back capability and is compatible with a wide variety of protocols.

Applications

* Microwave Point-to-Point Radios

* Test & Measurement

* Communications

* Military & Space

* Wide band: DC – 8 GHz RF Input, 4 GHz 19-Bit Prescaler

* Industry leading Phase Noise & Spurious -112 dBc/Hz @ 8 GHz Fractional, 50 kHz offset

* -230 dBc/Hz Fractional Mode

* -233 dBc/Hz Integer Mode 100 MHz PFD