atr2434 ATMEL Corporation, atr2434 Datasheet - Page 4

• Manufacturer Part Number: atr2434
• Description: Wirelessusb 2.4-ghz Dsss Radio Soc - Atmel Corporation
• Manufacturer: ATMEL Corporation

Applications Support
Functional Overview
2.4-GHz Radio
GFSK Modem
Dual DSSS Baseband
64 Chips/Bit Single Channel
4
ATR2434 [Preliminary]
The ATR2434 is supported by both the WirelessUSB Development Kit and the Wire-
lessUSB N:1 Development Kit. The development kit provides all of the materials and
documents needed to cut the cord on multipoint to point and point to point low band-
width high node density applications including four small form-factor sensor boards and
a hub board that connect to WirelessUSB RF module boards, comprehensive Wire-
lessUSB protocol code examples and all of the associated schematics, gerber files and
bill of materials. The WirelessUSB N:1 Development Kit is also supported by the Wire-
lessUSB Listener Tool.
The ATR2434 provides a complete WirelessUSB SPI to antenna radio modem. The
ATR2434 is designed to implement wireless devices operating in the worldwide 2.4-GHz
Industrial, Scientific, and Medical (ISM) frequency band (2.400 GHz to 2.4835 GHz). It
is intended for systems compliant with world-wide regulations covered by
ETSI EN 301 489-1 V1.4.1, ETSI EN 300 328-1 V1.3.1 (European Countries);
FCC CFR 47 Part 15 (USA and Industry Canada) and ARIB STD-T66 (Japan).
The ATR2434 contains a 2.4-GHz radio transceiver, a GFSK modem and a dual DSSS
reconfigurable baseband. The radio and baseband are both code- and frequency-agile.
Forty-nine spreading codes selected for optimal performance (Gold codes) are sup-
ported across 78 1-MHz channels yielding a theoretical spectral capacity of 3822
channels. The ATR2434 supports a range of up to 50 meters or more.
The receiver and transmitter are a single-conversion low-Intermediate Frequency
(low-IF) architecture with fully integrated IF channel matched filters to achieve high per-
formance in the presence of interference. An integrated Power Amplifier (PA) provides
an output power control range of 30 dB in seven steps.
Both the receiver and transmitter integrated Voltage Controlled Oscillator (VCO) and
synthesizer have the agility to cover the complete 2.4-GHz GFSK radio transmitter ISM
band. The VCO loop filter is also integrated on-chip.
The transmitter uses a DSP-based vector modulator to convert the 1-MHz chips to an
accurate GFSK carrier.
The receiver uses a fully integrated Frequency Modulator (FM) detector with automatic
data slicer to demodulate the GFSK signal.
Data is converted to DSSS chips by a digital spreader. De-spreading is performed by an
oversampled correlator. The DSSS baseband cancels spurious noise and assembles
properly correlated data bytes.
The DSSS baseband has four operating modes: 64 chips/bit single channel, 32 chips/bit
dual channel, 32 chips/bit single channel 2 × oversampled, and 32 chips/bit single
channel Dual Data Rate (DDR).
The baseband supports a single data stream operating at 15.625 kbits/s. The advantage
of selecting this mode is its ability to tolerate a noisy environment. This is because the
15.625 kbits/s data stream utilizes the longest PN code resulting in the highest probabil-
ity for recovering packets over the air. This mode can also be selected for systems
requiring data transmissions over longer ranges.
4822C–ISM–09/04