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1
File Number
4699.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
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Copyright
Intersil Corporation 1999
PRISM and PRISM logo are trademarks of Intersil Corporation.
ADVANCE INFORMATION
HFA3861
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
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
Simplified Block Diagram
PART NO.
TEMP.
RANGE (
o
C)
PKG. TYPE
PKG. NO.
HFA3861IV
-40 to 85
64 Ld TQFP
Q64.10x10
HFA3861IV96
-40 to 85
Tape and Reel
6463 62 61 60 59 58 57 56 55 54 53 52 51 50 49
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
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
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
S
R
T
R
C
T
T
V
D
G
T
M
R
R
T
T
T
V
D
T
R
G
I
R
V
D
T
T
G
C
C
G
T
T
V
D
C
6
7
6
6
6
6
7
1
1
ANT_SEL
RX_RF_AGC
RX_IF_DET
THRESH.
DETECT
IF
DAC
I ADC
Q ADC
44MHz MCLK
HFA 3861 BBP
TX
ALC
TX
DAC
TX
ADC
I DAC
Q DAC
MOD
I/O
DEMOD
AGC
CTL
V
REF
RX_Q
±
RX_I
±
RX_IF_AGC
TX_Q
±
TX_I
±
TX_IF_AGC
TX_AGC_IN
DATA I/O
Data Sheet
July 1999