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參數(shù)資料
| 型號(hào)： | RF105 |
| 英文描述： | 900 MHz Digital Spread Spectrum Transceiver |
| 中文描述： | 900兆赫數(shù)字?jǐn)U頻收發(fā)器 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 119K |
| 代理商： | RF105 |
Data Sheet
Conexant Proprietary Informati
on
Doc. No. W117, Rev. B
September 28, 1999
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.
LNAATTN
Phase
Modulator
Prescaler
÷47
Counter
Control Logic
÷16
LNAIN
Ext.
VCO
Mixers
Power
PFD/CP
Gain Ctrl.
RFO1
RFO2
LNA
FREF
GMCRES
RXQ
RXI
STROBE
RXEN
SYNTHEN
TXD
MODSET
PS1
PS2
1200kHz 820kHz
Ext. CSERVO
1200kHz 820kHz
Ext. CSERVO
Figure 1. RF105 Block Diagram
RF105
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
1
1
1
1
1
1
1
2
2
2
2
2
4
4
4
4
4
4
4
4
3
4
3
3
S
G
S
V
G
N
C
V
V
C
N
G
GND1
TXD
TVCC1
LNLNAIN
GND3
M
G
R
P
G
M
T
R
G
P
G
G
VCC2
VCC3
RXI+
Figure 2. RF105 Pin Signals – 48 Pin TQFP
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
LN
A/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
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