HFA3861B Datasheet, PDF (1/36 Pages) Intersil Corporation – Direct Sequence Spread Spectrum Baseband Processor

TM
Data Sheet
February 2002
HFA3861B
FN4816.2
Direct Sequence Spread Spectrum
Baseband Processor
The Intersil HFA3861B Direct
Sequence Spread Spectrum (DSSS)
baseband processor is part of the
PRISM® 2.4GHz WLAN Chip Set,
and contains all the functions necessary for a full or half
duplex packet baseband transceiver.
The HFA3861B 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 HFA3861B 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 HFA3861B is housed in a thin plastic quad
flat package (TQFP) suitable for PCMCIA board
applications.
Ordering Information
PART NUMBER
HFA3861BIN
HFA3861BIN96
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
NC
ANT-SEL
ANT-SEL
RX-RF_AGC
V_DDD
GNDd
TX_IF_AGC
RX_IF_AGC
COMPCAP1
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 ~50ns
• Supports Short Preamble Acquisition
• Supports Antenna Diversity
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
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 3861B BBP
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
PRISM® is a registered trademark of Intersil Corporation. PRISM and design is a trademark of Intersil Corporation.