2-99
HFA3824A
Direct Sequence Spread Spectrum
Baseband Processor
The Intersil HFA3824A Direct
Sequence (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 HFA3824A has on-board ADC’s for analog I and Q
inputs, for which the HFA3724/6 IF QMODEM is
recommended. Differential phase shift keying modulation
schemes DBPSK and DQPSK, with optional data scrambling
capability, are combined with a programmable PN sequence
of up to 16 bits. Built-in flexibility allows the HFA3824A to be
configured through a general purpose control bus, for a wide
range of applications. A Receive Signal Strength Indicator
(RSSI) monitoring function with on-board 6-bit 2 MSPS ADC
provides Clear Channel Assessment (CCA) to avoid data
collisions and optimize network throughput. The HFA3824A
is housed in a thin plastic quad flat package (TQFP) suitable
for PCMCIA board applications.
Ordering Information
Features
Complete DSSS Baseband Processor
High Data Rate. . . . . . . . . . . . . . . . . . . . . . .up to 4 MBPS
Processing Gain. . . . . . . . . . . . . . . . . . . . . . . . up to 12dB
Programmable PN Code . . . . . . . . . . . . . . . .up to 16 Bits
Ultra Small Package. . . . . . . . . . . . . . . . . . . . 7 x 7 x 1mm
Single Supply Operation (44MHz Max) . . . . .2.7V to 5.5V
Modulation Method. . . . . . . . . . . . . . . .DBPSK or DQPSK
Supports Full or Half Duplex Operations
On-Chip A/D Converters for I/Q Data (3-Bit, 44 MSPS)
and RSSI (6-Bit, 2 MSPS)
Backward Compatible with HSP3824
Programmable Rotation I, Q Sense
Applications
Systems Targeting IEEE802.11 Standard
DSSS PCMCIA Wireless Transceiver
Spread Spectrum WLAN RF Modems
TDMA Packet Protocol Radios
Part 15 Compliant Radio Links
Portable Bar Code Scanners/POS Terminal
Portable PDA/Notebook Computer
Wireless Digital Audio
Wireless Digital Video
PCN/Wireless PBX
PART NO.
TEMP.
RANGE (
o
C)
PKG. TYPE
PKG. NO.
HFA3824AIV
-40 to 85
48 Ld TQFP
Q48.7x7
HFA3824AIV96
-40 to 85
Tape and Reel
Pinout
HFA3824A (TQFP)
T
Simplified Block Diagram
1
2
3
4
5
6
7
8
9
10
11
1213 14 15 16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
RXCLK
RXD
MD_RDY
RX_PE
CCA
GND
MCLK
V
DD
RESET
ANTSEL
A/D_CAL
SD
TEST_CK
TX_PE
TXD
TXCLK
TX_RDY
GND
V
DD
R/W
CS
V
DDA
GND
I
IN
I
O
Q
O
T
T
V
D
G
T
T
T
T
T
Q
I
R
G
V
R
V
R
V
D
G
V
D
V
D
G
A
S
RSSI
I
IN
Q
IN
I
OUT
Q
OUT
DPSK
DEMOD.
PRO-
CESSOR
INTER-
FACE
DPSK
MOD.
D
CTRL
P
6-BIT
A/D
3-BIT
A/D
3-BIT
A/D
CCA
S
D
Data Sheet
August 1998
File Number
4459.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
|
Copyright
Intersil Corporation 1999
PRISM is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.