IFR3300:A10
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BOARD - P6.0
IFR3300 Overview
The IFR3300 provides key IF to digital baseband processing for subscriber unit receivers, including IF AGC
amplification, quadrature down conversion to analog baseband, baseband filtering and amplification, and I and Q
digitization Figure 1). The IFR3300 provides these critical receiver functions for three different operating modes:
CDMA, AMPS FM, and GPS position location. It is functionally compatible with the IFR3000, while adding GPS
processing capability. Designer familiarity with the IFR3000 simplifies and expedites position location
implementations using the IFR3300, with negligible impact to existing IF and baseband designs.
Figure 1: IFR3300 Block Diagram
The IFR3300 interfaces with RFR3100 or RFR3300 based RF subsystems, and with the MSM5100 Mobile
Station Modem (MSM) for digital control and data processing. It is fabricated on an advanced BiCMOS silicon
process and designed to operate with 2.7 to 3.15 volt power supplies. Although the MSMs operate at lowe
voltages, compatibility is assured and latch-up is prevented by IFR3300 input and output buffers when its VDDM
(pin 41) is connected to the MSM pad voltage. The IFR3300 is available in the 48-pin bump chip carrier (48
BCC+) package only. It is not available in the 48-lead low-profile plastic quad flat pack (LQFP), an option fo
IFR3000 devices.
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