PRISM™ 2.4GHz Chip Set Data Sheet August 1997 File Number Direct Sequence Spread Spectrum Wireless Transceiver Chip Set Features The Intersil 2.4GHz PRISM™ chip set is a highly integrated six-chip solution for RF modems employing Direct Sequence Spread Spectrum (DSSS) signaling. Significant integration of transmit and receive functions employ the following ICs: complete integrated DSSS engine, the HFA3824; a quadrature modulator/demodulator, integrated with an IF limiter amplifier with RSSI, the HFA3724, HFA3726; a combined LNA/Mixer and upconverter/preamplifier, the HFA3624; a high performance, low noise amplifier for increased receiver sensitivity, the HFA3424; a dual synthesizer, the HFA3524 and a monolithic RF power amplifier, the HFA3925. Each of the functions may be used individually or in any combination in support of a variety of RF modem applications. • Low Voltage Operation from 2.7V to 5.5V The PRISM™ chip set is intended to support various data rates including systems targeting the proposed IEEE 802.11 standard “Direct Sequence Physical layer (DS-PHY)”. Differential BPSK and QPSK signaling is employed with differential encoding and decoding of packetized data. A PN sequence rate of up to 22 MCPS is supported for up to a 16 chip PN code. Integrated programmable low pass filters are used on the HFA3724 to allow chip rates from 2.75 MCPS to 22 MCPS. A flexible general purpose data and control interface is provided for parameter configuration and for transferring data packets between the PHY and Media Access Control (MAC) layers. Data rates of up to 2 MBPS for DBPSK and 4 MBPS for DQPSK are supported. • Data Rates up to 4 MBPS DQPSK 4063.6 • Provides Antenna-to-Bits™ Data Stream ™ • 2.4GHz - 2.5GHz ISM Band Operation • Single Heterodyne Conversion • Programmable Antialiasing and Shaping Filters • 10MHz to 400MHz IF Operation with RSSI • Autonomous Half Duplex Direct Sequence Modem • Selectable DBPSK, DQPSK Signalling • Antenna Diversity Selection • Direct Sequence Physical Layer (DS-PHY) • Differential Data Encoding/Decoding • Programmable 16-Bit PN Code • Power Management Control • Low Profile PCMCIA-Compatible Surface Mount Packaging Applications • Systems Targeting IEEE 802.11 Standard • PCMCIA Wireless Transceiver • WLAN RF Modems • TDMA Packet Protocol Radios • Part 15 Compliant Radio Links HFA3724, HFA3726 HFA3824 (FILE# 4067, 4310) (FILE# 4308) TUNE/SELECT HFA3424 (NOTE) RXI (FILE# 4131) A/D DESPREAD RXQ I ÷2 (FILE# 4066) 0o/90o M M U U X X RSSI A/D A/D CCA TXI SPREAD RFPA VCO HFA3925 VCO TXQ Q 802.11 MAC-PHY INTERFACE CTRL HFA3624 UP/DOWN CONVERTER DPSK DEMOD DATA TO MAC Typical Application Diagram DPSK MOD. (FILE# 4132) QUAD IF MODULATOR DSSS BASEBAND PROCESSOR DUAL SYNTHESIZER HFA3524/A (FILE# 4062) PRISM™ CHIP SET FILE #4063 NOTE: Required for systems targeting 802.11 specifications. 2-5 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999 PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation. Antenna to Bits™ is a trademark of Intersil Corporation. PRISM™ 2.4GHz Chip Set Typical 802.11 DS-PHY System Level Performance (Note 5) (Measured at a diversity antenna port) Receiver General Specifications • Frequency Range . . . . . . . . . . . . . . . 2.4GHz - 2.4835GHz • Targeted Standard . . . . . . . . . . . . . . . . . . . . .IEEE 802.11 • Step Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1MHz • Cascaded Noise Figure . . . . . . . . . . . . . . . . . . . . . . 6.8dB • Data Rate . . . . . . . . . . . . . . . . . . . . . . . . .1 MBPS DBPSK 2 MBPS DQPSK • Sensitivity . . . . . . . . -93dBm, 1 MBPS, 8E-2 FER (Note 1) -90dBm, 2 MBPS, 8E-2 FER (Note 1) • Range. . . . . . . . . . . . . . . . . . . . . . . . 400ft Indoor (Note 2) 3700ft Outdoor (Note 2) • Input Intercept Point . . . . . . . . . . . . . . . . . . . . . . . -17dBm • RX/TX Switching Speed . . . . . . . . . . . . . . . . . . . . . . . . 2µs • IF Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280MHz • Power Savings Modes - Mode 1: 190mA at 1µs Recovery (Notes 3, 4) - Mode 2: 70mA at 25µs Recovery (Notes 3, 4) - Mode 3: 60mA at 2ms Recovery (Notes 3, 4) - Mode 4: 30mA at 5ms Recovery (Notes 3, 4) • IF Bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17MHz • Image Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80dB • Adjacent Channel Rejection . . . . . . . . . . . . . . . . . . >35dB • Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . .2.7V - 5.5V Transmitter • Frequency Range . . . . . . . . . . . . . . 2.4GHz - 2.4835GHz • Step Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1MHz • Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18dBm • Average Current (Without Power Savings Modes) . . . . . . . 298mA (Note 6) • Average Current (With Power Savings Modes) . . . . . . . . . . . 60mA (Note 7) NOTES: • Spurious Outputs . . . . . . . . . . . . . . Targeting ISM/802.11 1. FER = Frame Error Rate or Packet Error Rate. • Transmit Spectral Mask . . . . . . -32dBr at First Side-Lobe 2. Range Test using AND-C-107 omnidirectional antenna. • IF Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280MHz 3. Supply current includes AM79C930 MAC Processor. • Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . .2.7V - 5.5V 4. Recovery time is for the PRISM™ 2.4GHz Chip Set only and does not include programming latency of the AM79C930 MAC Processor. 5. Refer to Application Note AN9624 for more information on the “PRISM™ DSSS PC Card Wireless LAN Description”. 6. Based on average current consumption for “typical” application. 7. Power savings modes refer to AN9665. Average radio current consumption for “typical” application. All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil semiconductor products are sold by description only. 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