RF109 Просмотр технического описания (PDF) - Conexant Systems
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RF109 Datasheet PDF : 12 Pages
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RF109
2400 MHz Digital Spread Spectrum Transceiver
The RF109, a fully integrated transceiver device, provides the transmit, receive, and
frequency synthesis functions for 2400 MHz digital spread spectrum systems operating
in the 2400–2483.5 MHz portion of the ISM (Industrial, Scientific, Medical) band. The
device has a direct conversion architecture that minimizes circuit complexity and cost.
The receive path of the RF109 provides complete RF-to-baseband I/Q demodulation,
including an LNA, double-balanced quadrature mixers, fully integrated baseband filters,
and baseband variable-gain amplifiers. The transmit path is a variable-gain direct
conversion modulator. Figure 1 shows the RF109’s pin signals. Figure 2 shows the
RF109 block diagram.
The RF109 generates the Local Oscillator (LO) frequencies using a Phase Lock Loop
(PLL) frequency synthesizer and an external 2.4 GHz Voltage Controlled Oscillator
(VCO). The PLL provides a full frequency range of 2392.2–2505.6 MHz.
The RF109 features low-voltage operation (3.0–4.5V) for low power consumption. A
complete RF system solution for 2.4 GHz cordless telephone applications can be
constructed with the RF109, a power amplifier, a differential 2.4 GHz frequency source
and a Transmit/Receive (T/R) switch.
NC1 1
CLK 2
FREF 3
DATA 4
TXREF 5
VCC1 6
VCC2 7
TXD 8
RXEN 9
LNAATTN 10
LNAIN 11
NC2 12
RF109
36 NC3
35 SRI+
34 SRI-
33 SRQ+
32 SRQ-
31 VCC4
30 GND3
29 RXI+
28 RXI-
27 RXQ+
26 RXQ-
25 VCC3
Figure 1. RF109 Pin Signals
Features
• Low power dissipation
• Fast settling from standby mode to active
mode
• Separate enable lines for transmit, receive,
and synthesizer
• 64 programmable channels with 1.8 MHz
channel spacing
• 3-battery-cell operation
• 48-pin TQFP package with exposed paddle
(refer to Figure 6)
• Receiver
− LNA/Quadrature mixer from RF down to
baseband
− Selectable LNA gain
− Integrated baseband filter with external
bandwidth adjustment
− Receiver baseband amplifier with
automatic gain control
− Direct conversion with differential
baseband outputs
− Low system noise figure (9.0 dB typical)
− Large dynamic range (89 dB typical)
• Transmitter
− Variable gain modulator
− Mixer for baseband-to-RF modulation
− Differential TX inputs and outputs
− Selectable transmitter output levels for
high, medium, and low power modes
Applications
• Digital Spread Spectrum (DSS) cordless
telephone
• Direct sequence spread spectrum systems
• Frequency hopping spread spectrum
systems
• Wireless LANs
• Wireless modems
• Wireless security
• Inventory control systems
Data Sheet
Conexant Proprietary
Doc. No. 100646A
January 19, 2000
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