Harris Corporation HFA3860IV

The HFA3860 provides transmit spreading, receive despreading and packet-baseband functions for full- or half-duplex direct-sequence links. It connects to companion PRISM radio components and a MAC/PHY interface. It is not a complete RF transceiver.

• Selectable 1, 2, 5.5 and 11 Mbps DSSS operation.
• Integrated 3-bit I/Q receive A/D conversion at 22 MSPS.
• On-chip 6-bit RSSI conversion for clear-channel assessment.
• Full- or half-duplex packet-radio operation.
• 48-lead TQFP package for compact legacy wireless modules.

The transmit path includes packet formatting, scrambling and spreading. The receive path samples I/Q baseband signals and recovers packet data. The RSSI input supports clear-channel assessment, while diversity-control signals support compatible antenna arrangements. A serial control bus programs operating registers.

File 4347 lists HFA3860IV in the 48-lead TQFP, package number Q48.7x7. LCDChip's package register maps 48-TQFP to /upload/package/48-TQFP.jpg. Verify pitch, dimensions, pin-one location and thermal/assembly conditions against the controlled mechanical drawing.

Footprint checks

• Use the Q48.7x7 package drawing.
• Confirm analog and digital supply routing.
• Check I/Q signal and clock placement.

The registered JPG is missing locally and must be verified before publication.

The HFA3860 48-pin top-view and pin table identify MCLK at pin 30 and RESET at pin 28. IOUT and QOUT are transmit baseband outputs at pins 48 and 47; IIN and QIN receive the analog baseband inputs. TXD, TXCLK, TX_PE and TX_RDY support transmit packet timing. RXD, RXCLK, RX_PE, MD_RDY and CCA provide receive-side data and status. SCLK, SDI, SD, R/W and CS form the control interface. Connect all VDD, VDDA and ground pins as specified by the manufacturer.

The functional summary does not replace the manufacturer's numbered pin table for schematic review.

Use the electrical-characteristics tables and their test conditions for final design limits.

HFA3860IV96 is the manufacturer's tape-and-reel ordering entry for this device, but purchasing form and full label must still be checked. HFA3860BIV is a later device revision and is not an unconditional replacement. Compare register defaults, firmware, packet timing, RF companions, supply, package, temperature and qualification before selecting a substitute. No internal alternative link is provided without exact database and engineering confirmation.

The Harris/Intersil HFA3860 data sheet, July 1998, File Number 4347, contains the exact HFA3860IV ordering row, pin descriptions, functional architecture and electrical tables. This is historical PRISM documentation; verify lifecycle and lot provenance with a qualified source.

• Legacy IEEE 802.11-targeted DSSS WLAN designs.
• PRISM-based 2.4 GHz PCMCIA wireless transceivers.
• Point-to-point spread-spectrum packet-radio links.
• Repair of compatible portable terminals and industrial radio modules.

Confirm the complete HFA3860IV marking, package, lot traceability and lead condition against the purchase documentation. Test critical interfaces on the target board when replacing a legacy baseband IC. A web listing alone does not establish authenticity or electrical suitability.

Validate the original File 4347 pinout, supply decoupling, master clock, I/Q levels, MAC interface and RF-chain timing before board release. The missing package JPG and unverified current exact-code authorized stock and full price tiers block publication.