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鈥?28 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鈥?28 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
鈥?.
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
Features
鈥?/div>
Complete 900 MHz ISM band
transceiver with fully integrated
synthesizer and VCO including
resonator
鈥?/div>
Low power dissipation
鈥?/div>
Fast settling from standby mode to
active mode
鈥?/div>
Separate enable lines for transmit,
receive, and synthesizer
鈥?/div>
41 programmable channels with 600
kHz channel spacing
鈥?/div>
3-battery cell operation (2.7鈥?.5 V)
鈥?/div>
48-pin TQFP package (see Figure 2)
Receiver
鈥?/div>
LNA/Quadrature
mixer from RF down
to baseband
鈥?/div>
Selectable LNA gain
鈥?/div>
Fully integrated channel selection filter
with adjustable bandwidth
鈥?/div>
Receiver baseband amplifier with
variable gain
鈥?/div>
Differential receiver baseband outputs
LNA Mixers
1200kHz 820kHz
LNAIN
LNAATTN
1200kHz 820kHz
Ext. CSERVO
RXI
GMCRES
GC
RXQ
Transmitter
梅16
Phase
Shifter
VCO
Ext.
LPF
PFD/CP
梅47
FREF
STROBE
CLK
DATA
RXEN
SYNTHEN
TXEN
TXD
RFO1
RFO2
MODSET
PS1
PS2
Modulator
Prescaler
Counter
Modulator
Gain Ctrl.
Control Logic
Power
Mgmt.
鈥?/div>
Variable gain modulator
鈥?/div>
Double-balanced mixer for baseband-
to-RF modulation
鈥?/div>
Differential RF outputs
Applications
鈥?/div>
DSS cordless telephone
鈥?/div>
Direct sequence spread spectrum
systems
鈥?/div>
Frequency hopping spread spectrum
systems
鈥?/div>
Wireless LANs
鈥?/div>
Wireless modems
鈥?/div>
Wireless security
鈥?/div>
Inventory control systems
Figure 1. RF105 Block Diagram
GND10
STROBE
SYNTHEN
VCC5
CHPO
NC
GND9
VCOBPC
CON
VCC4
NC
GND8
1
2
3
4
5
6
7
8
9
10
11
12
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
GND1
CLK
FREF
DATA
TXREF
VCC1
TXD
GND2
RXEN
LNAATTN
LNAIN
GND3
RF105
GND7
SRI+
SRI-
SRQ+
SRQ-
VCC3
RXI+
RXI-
RXQ+
RXQ-
VCC2
GND6
Figure 2. RF105 Pin Signals 鈥?48 Pin TQFP
Data Sheet
GND4
MODSET
RFO1
RFO2
TXEN
MIXBPC
GMCRES
PS1
PS2
GCREF
GC
GND5
13
14
15
16
17
18
19
20
21
22
23
24
Conexant Proprietary Informati
on
Doc. No. W117, Rev. B
September 28, 1999
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