4-1
P
RODUCT
S
PECIFICATION
Z87200
4
S
PREAD
-S
PECTRUM
T
RANSCEIVER
FEATURES
■
Complete Direct Sequence Spread-Spectrum
Transceiver in a Single CMOS IC
■
Programmable Functionality Supports Many Different
Operational Modes
■
Acquires Within One Symbol Duration Using Digital PN
Matched Filter
■
Two Independent PN Sequences, Each up to 64 Chips
Long for Distinct Processing of the Acquisition/Preamble
Symbol and Subsequent Data Symbols
■
Power Management Features
■
Optional Spectral Whitening Code Generation
■
Full- or Half-Duplex Operation
Benefits
■
High Performance and High Reliability for Reduced
Manufacturing Costs
■
Ideal for a Wide Range of Wireless Applications
Including Data Acquisition Systems, Transaction
Systems, and Wireless Local Area Networks (WLANs)
■
Fast Response and Very Low Overhead when
Operating in Burst Modes
■
Allows High Processing Gain to Maximize the
Acquisition Probability, then Reduced Code Length for
Increased Data Rate
■
Reduced Power Consumption
■
Randomizes Data to Meet Regulatory Requirements
■
Permits Dual Frequency (Frequency Division Duplex) or
Single Frequency (Time Division Duplex) Operation
■
Small Footprint, Surface Mount
GENERAL DESCRIPTION
The Z87200 is a programmable single-chip, spread-spec-
trum, direct-sequence transceiver. The Z87200 incorpo-
rates Stanford Telecom spread-spectrum and wireless
technology and is identical to Stanford Telecom's STEL-
2000A. By virtue of its fast acquisition capabilities and its
ability to support a wide range of data rates and spread-
spectrum parameters, the Z87200 spread-spectrum trans-
ceiver supports the implementation of a wide range of
burst data communications applications.
Available in both 45- and 20-MHz versions, the Z87200
performs all the digital processing required to implement a
fast-acquisition direct sequence (such as pseudonoise- or
PN-modulated), spread-spectrum full- or half-duplex sys-
tem. Differentially encoded BPSK and QPSK are fully sup-
ported. The receiver section can also handle differentially
encoded pi/4 QPSK. A block diagram of the Z87200 is
shown in Figure 1; its pin configuration is shown in Z87200
receive functions integrate the capabilities of a digital
downconverter, PN matched filter, and DPSK demodula-
tor, where the input signal is an analog-to-digital converted
I.F. signal. Z87200 transmit functions include a differential
BPSK/QPSK encoder, PN modulator (spreader), and
BPSK/QPSK modulator, where the transmitter output is a
sampled digitally modulated signal ready for external digi-
Device
Min
PN Rate*
(Mchips)
Max Data
Rate* (Mbps)
Speed
(MHz) Package
Z87200 11 2.048 20/45 100-Pin
PQFP
Note:
*45 MHz only
