HFA3724

HFA3724 Data Sheet November 1999 File Number 4067.7 400MHz Quadrature IF Modulator/Demodulator The Intersil 2.4GHz PRISM™ chip set is a highly integrated five-chip solution for RF modems employing Direct Sequence Spread Spectrum (DSSS) signaling. The HFA3724 400MHz Quadrature IF Modulator/Demodulator is one of the five chips in the PRISM™ chip set (see the Typical Application Diagram). ™ Features Integrates all IF Transmit and Receive Functions Broad Frequency Range . . . . . . . . . . . 10MHz to 400MHz I/Q Amplitude and Phase Balance . . . . . . . . . . . 0.2dB, 2o 5th Order Programmable Low Pass Filter. . . . . . . . . . . . . . . . . . . 2.2MHz - 17.6MHz 400MHz Limiting IF Gain Strip with RSSI. . . . . . . . . .84dB Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . . -15dBm Fast Transmit-Receive Switching . . . . . . . . . . . . . . . . . 1µs Power Management/Standby Mode Single Supply 2.7V to 5.5V Operation The HFA3724 is a highly integrated baseband converter for quadrature modulation applications. It features all the necessary blocks for baseband modulation and demodulation of I and Q signals. It has a two stage integrated limiting IF amplifier with 84db of gain with a built in Receive Signal Strength Indicator (RSSI). Baseband antialiasing and shaping filters are integrated in the design. Four filter bandwidths are programmable via a two bit digital control interface. In addition, these filters are continuously tunable over a ±20% freq...