HFA3861 Datasheet, PDF (1/35 Pages) Intersil Corporation – Direct Sequence Spread Spectrum Baseband Processor

ADVANCE INFORMATION Data Sheet
HFA3861
July 1999 File Number 4699.1
Direct Sequence Spread Spectrum
Baseband Processor
™ _{The Intersil HFA3861 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 HFA3861 has on-board A/D’s 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 HFA3861 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 HFA3861 is housed in a thin plastic quad
flat package (TQFP) suitable for PCMCIA board
applications.
Ordering Information
PART NO.
HFA3861IV
HFA3861IV96
TEMP.
RANGE (^oC)
-40 to 85
-40 to 85
PKG. TYPE
64 Ld TQFP
Tape and Reel
PKG. NO.
Q64.10x10
Pinout
Features
• Complete DSSS Baseband Processor
• 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 ~100ns
• Supports Short Preamble Acquisition
Applications
• Enterprise WLAN Systems
• Systems Targeting IEEE 802.11 Standard
• DSSS PCMCIA Wireless Transceiver
• Spread Spectrum WLAN RF Modems
• TDMA Packet Protocol Radios
• Part 15 Compliant Radio Links
• Portable PDA/Notebook Computer
• Wireless Digital Audio, Video, Multimedia
• PCN/Wireless PBX
• Wireless Bridges
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
NC
ANT-SEL
ANT-SEL
RX-RF_AGC
V_DDD
GNDd
TX_IF_AGC
RX_IF_AGC
COMPCAP1
Simplified Block Diagram
ANT_SEL
RX_RF_AGC
1
RX_IF_DET _{THRESH. 1}
RX_IF_AGC
DETECT
IF
7
DAC
RX_I±
RX_Q±
V_REF
6
I ADC
6
Q ADC
TX_I±
TX_Q±
6
I DAC
6
Q DAC
AGC
CTL
DEMOD
DATA I/O
I/O
MOD
TX_IF_AGC
TX_AGC_IN
44MHz MCLK
TX
DAC
TX
ADC
7
TX
ALC
6
HFA 3861 BBP
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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PRISM and PRISM logo are trademarks of Intersil Corporation.