GENERAL DESCRIPTION

The ADRF6655 is a high dynamic range active mixer with integrated PLL and VCO. The synthesizer uses a programmable integer-N/fractional-N PLL to generate a local oscillator input to the mixer. The PLL reference input is nominally 20 MHz. The reference input can be divided by or multiplied by and then applied to the PLL phase detector. The PLL can support input reference frequencies from 10 MHz to 160 MHz. The phase

detector output controls a charge pump whose output is integrated in an off-chip loop filter. The loop filter output is then applied to an integrated VCO. The VCO output at 2 × fLO is then applied to a local oscillator (LO) divider as well as to a programmable PLL divider.

FEATURES

Broadband active mixer with integrated fractional-N PLL

RF input frequency range: 100 MHz to 2500 MHz

Internal LO frequency range: 1050 MHz to 2300 MHz

Flexible IF output interface

Input P1dB: 12 dBm

Input IP3: 29 dBm

Noise figure (SSB): 12 dB

Voltage conversion gain: 6 dB

Matched 200 Ω output impedance

SPI serial interface for PLL programming

40-lead 6 mm × 6 mm LFCSP