Product Description

The RF9958 is an integrated complete Quadrature Modulator, IF AGC amplifier, and Upconverter designed for the transmit section of dual-mode CDMA/FM cellular and PCS 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 for CDMA cellular communications. This circuit is designed as part of RFMD’s newest CDMA Chip Set, which also includes the RF9957 CDMA/FM Receive IF AGC and Demodulator. The IC is manufactured on an advanced 15GHz FT Silicon Bipolar process, and is supplied in a 28-lead plastic SSOP package.

Features

• Supports Dual Mode Operation

• Digitally Controlled Power Down Modes

• 2.7V to 3.3V Operation

• Digital First LO Quadrature Divider

• Double-Balanced UHF Upconvert Mixer

• IF AGC Amp with 95 dB Gain Control

Typical Applications

• CDMA/FM Cellular Systems

• CDMA PCS Systems

• Wireless Local Loop Systems

• Spread Spectrum Cordless Phones

• High Speed Data Modems

• General Purpose Digital Transmitters