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
鈥?Complete DSSS Baseband Processor
鈥?High Data Rate. . . . . . . . . . . . . . . . . . . . .up to 4 MBPS
鈥?Processing Gain . . . . . . . . . . . . . . . . . . . . . up to 12dB
鈥?Programmable PN Code . . . . . . . . . . . . up to 16 Bits
鈥?Ultra Small Package . . . . . . . . . . . . . . . . . 7 x 7 x 1mm
鈥?Single Supply Operation (33MHz Max) . . 2.7V to 5.5V
鈥?Single Supply Operation (44MHz Max) . . 3.3V to 5.0V
鈥?Modulation Method . . . . . . . . . . . . . DBPSK or DQPSK
鈥?Supports Full or Half Duplex Operations
鈥?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鈩?/div>
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鈥檚 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 鏗俥xibility allows
the HSP3824 to be con鏗乬ured 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 鏗俛t package (TQFP) suitable for
PCMCIA board applications.
Applications
鈥?Systems Targeting IEEE802.11 Standard
鈥?DSSS PCMCIA Wireless Transceiver
鈥?Spread Spectrum WLAN RF Modems
鈥?TDMA Packet Protocol Radios
鈥?Part 15 Compliant Radio Links
鈥?Portable Bar Code Scanners/POS Terminal
鈥?Portable PDA/Notebook Computer
鈥?Wireless Digital Audio
鈥?Wireless Digital Video
鈥?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
Simpli鏗乪d 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
漏
Harris Corporation 1996
1
PRISM鈩?and the PRISM鈩?logo are Trademarks of Harris Corporation
File Number
4064.2
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