Analog Devices ADRF6704-EVALZ

ADRF6704 Quadrature Modulator with Frac-N PLL and Integrated VCO Evaluation Board

EVAL, QUAD, MODULATOR, ADRF6704; Silicon Manufacturer:Analog Devices; Kit Application Type:Communication; Application Sub Type:Quadrature Modulator; Features:SPI Serial Interface for PLL Programming, Integrated LDOs and LO Buffer; SVHC:No SVHC (18-Jun-2012)

The ADRF6704 provides a quadrature modulator and synthesizer solution within a small 6 mm × 6 mm footprint while requiring minimal external components. The ADRF6704 is designed for RF outputs from 2050 MHz to 3000 MHz. The low phase noise VCO and high performance quadrature modulator make the ADRF6704 suitable for next generation communication systems requiring high signal dynamic range and linearity. The integration of the IQ modulator, PLL, and VCO provides for significant board savings and reduces the BOM and design complexity. The integrated fractional-N PLL/synthesizer generates a 2× fLO input to the IQ modulator. The phase detector together with an external loop filter is used to control the VCO output. The VCO output is applied to a quadrature divider. To reduce spurious components, a sigma-delta (Σ-Δ) modulator controls the programmable PLL divider. The IQ modulator has wideband differential I and Q inputs, which support baseband as well as complex IF architectures. The single-ended modulator output is designed to drive a 50 Ω load impedance and can be disabled. The ADRF6704 is fabricated using an advanced silicon-germanium BiCMOS process. It is available in a 40-lead, exposed-paddle, Pb-free, 6 mm × 6 mm LFCSP package. Performance is specified from −40°C to +85°C. A lead-free evaluation board is available. Applications Cellular communications systems GSM/EDGE, CDMA2000, W-CDMA, TD-SCDMA, LTE Broadband wireless access systems Satellite modems