HFA3863 Datasheet, PDF (1/39 Pages) Intersil Corporation – Direct Sequence Spread Spectrum Baseband Processor

TM
PRELIMINARY
Data Sheet
HFA3863
April 2000
File Number 4856
Direct Sequence Spread Spectrum
Baseband Processor
The Intersil HFA3863 Direct Sequence
Spread Spectrum (DSSS) baseband
processor is part of the PRISM® 2.4GHz
radio chipset, and contains all the
functions necessary for a full or half duplex
packet baseband transceiver.
The HFA3863 has on-board A/D’s and D/A for analog I and Q
inputs and outputs, for which the HFA3783 IF QMODEM is
recommended. Differential phase shift keying modulation
schemes DBPSK and DQPSK, with data scrambling capability,
are available along with Complementary Code Keying to provide
a variety of data rates. Built-in flexibility allows the HFA3863 to be
configured through a general purpose control bus, for a range of
applications. Both Receive and Transmit AGC functions with 7-bit
AGC control obtain maximum performance in the analog
portions of the transceiver. The HFA3863 is housed in a thin
plastic quad flat package (TQFP) suitable for PCMCIA board
applications. It is pin compatible with the HFA3861B.
Ordering Information
PART NUMBER
HFA3863IN
HFA3863IN96
TEMP.
RANGE (^oC)
-40 to 85
-40 to 85
PACKAGE
64 Ld TQFP
Tape and Reel
PKG. NO.
Q64.10x10
Pinout
GNDd
V_DDD
SD
SCLK
R/W
CS
GNDd
V_DDD
GNDa
RX_I+
RX_I-
V_DDA
RX_Q+
RX_Q-
GNDa
V_REF
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12
37
13
36
14
35
15
34
16
33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
TEST4
TEST3
TEST2
TEST1
TEST0
GNDd
MCLK
V_DDD
ANT-SEL
ANT-SEL
RX-RF_AGC
V_DDD
GNDd
TX_IF_AGC
RX_IF_AGC
COMPCAP1
Features
• Complete DSSS Baseband Processor
• RAKE Receiver with Decision Feedback Equalizer
• Processing Gain . . . . . . . . . . . . . . . . . . . . FCC Compliant
• Programmable Data Rate. . . . . . . . 1, 2, 5.5, and 11Mbps
• Ultra Small Package . . . . . . . . . . . . . . . . . . . . . 10 x 10mm
• Single Supply Operation (44MHz Max) . . . . . 2.7V to 3.6V
• Modulation Methods . . . . . . . . DBPSK, DQPSK, and CCK
• Supports Full or Half Duplex Operations
• On-Chip A/D and D/A Converters for I/Q Data (6-Bit,
22MSPS), AGC, and Adaptive Power Control (7-Bit)
• Targeted for Multipath Delay Spreads 125ns at 11Mbps,
250ns at 5.5Mbps
• Supports Short Preamble and Antenna Diversity
Applications
• Enterprise WLAN Systems
• Systems Targeting IEEE 802.11b Standard
• DSSS PCMCIA or Mini-PCI Wireless Transceiver
• Spread Spectrum WLAN RF Modems
• TDMA or CSMA Packet Protocol Radios
• Part 15 Compliant Radio Links
• Portable PDA/Notebook Computer
• Wireless Digital Audio, Video, Multimedia
• PCN / Wireless PBX / Wireless Local Loop
• Wireless Bridges
Simplified Block Diagram
ANT_SEL
RX_RF_AGC
1
RX_IF_DET ^THRESH.
DETECT ¹
RX_IF_AGC
7
IF
DAC
RX_I±
RX_Q±
V_REF
6
I ADC
6
Q ADC
TX_I±
TX_Q±
I DAC ₆
6
Q DAC
AGC
CTL
DEMOD
DATA I/O
I/O
MOD
TX_IF_AGC
TX
DAC
TX_AGC_IN
TX
ADC
44MHz MCLK
7
TX
ALC
6
HFA 3863 BBP
4-1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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