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HFA3724IN Datasheet(PDF) 1 Page - Intersil Corporation |
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HFA3724IN Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 24 page 1 HFA3724 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). 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% frequency range via one external resistor. The modulator channel receives digital I and Q data for processing. To achieve broadband operation, the Local Oscillator frequency input is required to be twice the desired frequency of modulation/demodulation. A selectable buffered divide by 2 LO output and a stable reference voltage are provided for convenience of the user. The device is housed in a thin 80 lead TQFP package well suited for PCMCIA board applications. 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 . . . . . . . . . . . . . . . . . 1 µs • Power Management/Standby Mode • Single Supply 2.7V to 5.5V Operation Applications • Systems Targeting IEEE 802.11 Standard • TDD Quadrature-Modulated Communication Systems • Wireless Local Area Networks • PCMCIA Wireless Transceivers • ISM Systems • TDMA Packet Protocol Radios • PCS/Wireless PBX • Wireless Local Loop Simplified Block Diagram Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE PKG. NO. HFA3724IN -40 to 85 80 Ld TQFP Q80.14x14 HFA3724IN96 -40 to 85 Tape and Reel ™ 0o/90o LIM1_IN MOD_LO_IN MOD_TX_IF_OUT LPF_RXQ _OUT RSSI2 MOD_LO_OUT RSSI1 ÷2 LPF_TXI_IN LPF_TXQ_IN 2V REF LPF_RXI_OUT I Q LO_GND IF IF ∑ M U X M U X Data Sheet November 1999 File Number 4067.7 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999 PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation. |
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