RF2668

Preliminary RF2668 CDMA/FM TRANSMIT MODULATOR, IF AGC, AND UPCONVERTER WITH INTEGRATED PLL 5 Typical Applications CDMA/FM Cellular and PCS Systems Tri-Mode/Dual-Band CDMA Applications W-CDMA Systems Wireless Local Loop Systems Spread-Spectrum Cordless Phones High Speed Data Modems Product Description The RF2668 is an integrated complete quadrature modulator, IF AGC amplifier, upconverter, and PLL, designed for the transmit section of dual-mode CDMA/FM cellular, PCS, and tri-mode CDMA applications. It is designed to modulate baseband I and Q signals, amplify the resulting IF signals while providing 95dB of gain control range, and perform the final upconversion to UHF. Noise Figure, IP3, and other specifications are designed to be compatible with the IS-98 Interim Standard. This circuit is designed as part of RFMD’s newest CDMA chipset, which also includes the RF2667 CDMA/FM Receive IF AGC and Demodulator. The IC is manufactured on an advanced 18GHz FT Silicon Bipolar process, and is supplied in a 48-lead plastic LQFP package. Optimum Technology Matching® Applied 9.00 + 0.20 sq. 0.35 0.25 0.50 7.00 + 0.10 sq. 5 MODULATORS AND UPCONVERTERS 0.22 + 0.05 7° MAX 0° MIN 1.40 + 0.05 0.60 + 0.15 0.10 0.127 Package Style: LQFP-48_7x7 üSi Bi-CMOS MODE VCC3 BG 48 NC 1 NC 2 47 46 Band Gap Rel Si BJT GaAs HBT SiGe HBT VCO_EN PLLISET MIX_EN PLLON TX_EN GaAs MESFET Si CMOS VREFPLL OSCREF Features Supports Tri-Mode Operation Digitally Controlled Power Down Modes ...