RF105 Ver la hoja de datos (PDF) - Conexant Systems
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RF105 Datasheet PDF : 12 Pages
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RF105
900 MHz Digital Spread Spectrum Transceiver
The RF105, a fully integrated transceiver device, provides the transmit, receive, and
frequency synthesis functions for Digital Spread Spectrum (DSS) systems operating
in the 902–928 MHz Industrial, Scientific, and Medical (ISM) band. It implements a
direct conversion architecture and Time Division Duplexing (TDD) of the transmit
and receive signals to minimize circuit complexity.
The receive path of the RF105 provides complete RF-to-baseband In-Phase and
Quadrature (I/Q) demodulation, including a Low Noise Amplifier (LNA), double-
balanced quadrature mixers, fully integrated channel selection filters, and baseband
variable-gain amplifiers. The transmit path is a variable-gain direct conversion
modulator. These paths are shown in Figure 1.
A 902–928 MHz frequency synthesizer with on-chip VCO and resonator provides the
LO frequency for both transmit and receive modes.
The RF105 features low-voltage operation (2.7–4.5 V) for low power consumption.
The RF105, combined with Conexant's RF106 power amplifier, forms a complete
system solution for a direct conversion 900 MHz DSS radio that is fully compliant
with FCC Part 15 regulations in the ISM band.
Ext. CSERVO
LNAIN
LNAATTN
LNA Mixers
1200kHz 820kHz
1200kHz 820kHz
RXI
GMCRES
GC
RXQ
RFO1
RFO2
Phase
Shifter
Modulator
MODSET
PS1
PS2
Modulator
Gain Ctrl.
VCO
Ext.
LPF
Ext. CSERVO
PFD/CP ÷16
Prescaler ÷47
Counter
Control Logic
Power
Mgmt.
FREF
STROBE
CLK
DATA
RXEN
SYNTHEN
TXEN
TXD
Figure 1. RF105 Block Diagram
GND1 1
CLK 2
FREF 3
DATA 4
TXREF 5
VCC1 6
TXD 7
GND2 8
RXEN 9
LNAATTN 10
LNAIN 11
GND3 12
RF105
36 GND7
35 SRI+
34 SRI-
33 SRQ+
32 SRQ-
31 VCC3
30 RXI+
29 RXI-
28 RXQ+
27 RXQ-
26 VCC2
25 GND6
Features
• Complete 900 MHz ISM band
transceiver with fully integrated
synthesizer and VCO including
resonator
• Low power dissipation
• Fast settling from standby mode to
active mode
• Separate enable lines for transmit,
receive, and synthesizer
• 41 programmable channels with 600
kHz channel spacing
• 3-battery cell operation (2.7–4.5 V)
• 48-pin TQFP package (see Figure 2)
Receiver
• LNA/Quadrature mixer from RF down
to baseband
• Selectable LNA gain
• Fully integrated channel selection filter
with adjustable bandwidth
• Receiver baseband amplifier with
variable gain
• Differential receiver baseband outputs
Transmitter
• Variable gain modulator
• Double-balanced mixer for baseband-
to-RF modulation
• Differential RF outputs
Applications
• DSS cordless telephone
• Direct sequence spread spectrum
systems
• Frequency hopping spread spectrum
systems
• Wireless LANs
• Wireless modems
• Wireless security
• Inventory control systems
Data Sheet
Figure 2. RF105 Pin Signals – 48 Pin TQFP
Conexant Proprietary Information
Doc. No. W117, Rev. B
September 28, 1999
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