S E M I C O N D U C T O R
HSP3824
Direct Sequence Spread Spectrum
Baseband Processor
TM
PRELIMINARY
March 1996
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 (33MHz Max) . . 2.7V to 5.5V
• Single Supply Operation (44MHz Max) . . 3.3V to 5.0V
• 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)
Description
The Harris HSP3824 Direct
Sequence (DSSS) baseband pro-
cessor is part of the PRISM™
2.4GHz radio chipset, and contains
all the functions necessary for a full or half duplex packet base-
band transceiver.
The HSP3824 has on-board ADC’s for analog I and Q inputs, for
which the HFA3724 IF QMODEM is recommended. Differential
phase shift keying modulation schemes DBPSK and DQPSK,
with optional data scrambling capability, are combined with a pro-
grammable PN sequence of up to 16 bits. Built-in flexibility allows
the HSP3824 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 HSP3824 is
housed in a thin plastic quad flat package (TQFP) suitable for
PCMCIA board applications.
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
Ordering Information
PART NO.
HSP3824VI
TEMP. RANGE
-40
o
C to +85
o
C
PKG. TYPE
48 Lead TQFP
PKG. NO.
Q48.7x7
Simplified Block Diagram
Pinout
I
OUT
Q
OUT
HSP3824 (TQFP)
TEST7
TEST6
TEST5
TEST4
TEST3
TEST2
TEST1
TEST0
V
DD
GND
I
IN
DE-SPREADER
3-BIT
A/D
DATA TO NETWORK
PROCESSOR
DPSK
DEMOD.
Q
IN
3-BIT
A/D
TEST_CK
TX_PE
TXD
TXCLK
TX_RDY
GND
V
DD
R/W
CS
V
DD
GND
1
2
3
4
5
6
7
8
9
10
48 47 46 45 44 43 42 41 40 39 38 37
36
35
34
33
32
31
30
29
28
27
26
RXCLK
RXD
MD_RDY
RX_PE
CCA
GND
MCLK
V
DD
RESET
ANTSEL
A/D_CAL
SD
RSSI
6-BIT
A/D
CCA
PRO-
CESSOR
INTER-
FACE
CTRL
I
OUT
SPREADER
Q
OUT
DPSK
MOD.
I
IN
11
25
12
13 14 15 16 17 18 19 20 21 22 23 24
GND
V
REFP
V
REFN
GND
V
DD
SCLK
V
DD
RSSI
V
DD
GND
Q
IN
AS
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
©
Harris Corporation 1996
1
PRISM™ and the PRISM™ logo are Trademarks of Harris Corporation
File Number
4064.2
HARRIS [ HARRIS CORPORATION ]
