RF109 データシートの表示（PDF） - Conexant Systems
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RF109 Datasheet PDF : 12 Pages
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RF109
2400 MHz Digital Spread Spectrum Transceiver
Interface Description
Pin
18
9
46
21
22
10
3
2
4
47
8
5
23
28
29
26
27
24
38
39
43
11
15
16
Signal
TXEN
RXEN
SYNTHEN
PS1
PS2
LNAATTN
FREF
CLK
DATA
STROBE
TXD
TXREF
GCREF
RXI-
RXI+
RXQ-
RXQ+
AGC
VCO1
VCO2
CHPO
LNAIN
RFO1
RFO2
Table 2. RF109 Pin Signal Description (1 of 2)
Type
Description
Digital Signals1
Input Transmit Enable. Switches on/off bias power to the transmitter circuitry.
1: Tx on
0: Tx off
Input Receive Enable. Switches on/off bias power to the receiver circuitry.
1: Rx on
0: Rx off
Input Synthesizer Enable. Switches on/off bias power to the synthesizer circuitry.
1: Synthesizer on
0: Synthesizer off
Input Transmit Power. These two control bits select the PA output power.
Input
PS1=0, PS2=0: High (–8 dBm typical, single-ended)
PS1=0, PS2=1: Medium (–18 dBm typical, single-ended)
PS1=1, PS2=0: Low (–26.5 dBm typical, single-ended)
PS1=1, PS2=1: Undefined
Input LNA Attenuator. This control signal toggles the LNA gain between the low gain state and the high gain state.
1: Low gain, attenuator enabled
0: High gain, attenuator disabled
Input Reference Oscillator. This digital input clock signal is used to provide the reference frequency for the synthesizer. A 9.6 MHz
clock provides channel spacing of 1.8 MHz (see Table 1).
Input Synthesizer Programming Clock. This is the clock input signal used to serially shift the synthesizer data bits into the
synthesizer input register. The rising edge of CLK is used to load each data bit.
Input Synthesizer Programming Data. This is the serial data input bit stream used to program the synthesizer. Data bits are shifted
from MSB first to LSB. The DATA bit is loaded into the synthesizer input register on the rising edge of the CLK signal.
Input Synthesizer Programming Strobe. This signal is used to transfer the synthesizer data bits from the input register to the pulse
swallow counter, after all of the data bits have been shifted in. The data is transferred on the rising edge of the STROBE signal.
Analog Signals
Input
Input
Input
Output
Output
Output
Output
Input
Input
Input
Output
Input
Output
Transmit Data. This input signal is used as the modulating signal. TXD is a single-ended, 1.2 Mbps NRZ signal from the
baseband modem. The TXD signal shall be filtered first if any data/spectral shaping is desired. A resistor divider should be used
to provide the desired signal level at the TXD input of the RF109.
Tx Reference. This is the reference for the TXD input. It is AC-coupled to ground.
Gain Control Reference. This is the reference for the gain control input. It is connected to ground.
Received In-Phase Signal Negative, Received In-Phase Signal Positive. This differential signal pair is the in-phase portion of
the baseband output of the receiver. The differential output signal level is typically 0.5 Vp-p, within the AGC operating range of
1.35–1.9 V.
Received Quadrature Signal Negative, Received Quadrature Signal Positive. This differential signal pair is the quadrature
portion of the baseband output of the receiver. The differential output signal level is typically 0.5 Vp-p, within the AGC operating
range of 1.35–1.9 V.
Auto Gain Control. This analog input signal is used to control the gain of the baseband VGAs in the receiver. This signal is
generated by the baseband ASIC as part of the AGC control loop. An increase in the AGC voltage decreases the baseband VGA
gain. The control loop provides a typical receive baseband differential signal of 0.5 Vp-p over the VAGC range of 1.35–1.9 V.
Voltage Controlled Oscillator. This differential input provides the local oscillator signal from an external VCO to the RF109
mixers. An external BALUN may be used to convert a single-ended external VCO signal to the differential signals, VCO1 and
VCO2, required by the RF109. The differential input signal level required is typically 200 mVp-p.
Charge Pump Output. This output signal is used to control the external 2.4 GHz VCO. The CHPO current is typically ±250 µA.
RF Input. This is the received RF input signal that is routed to the LNA of the RF109. This pin should be externally matched to
50 Ω. The received signal must be AC coupled into LNAIN with a 12 pF series capacitor.
RF Output. These are the differential transmit output signals from the RF109. The single-ended output impedance is 50 Ω. The
RF output signals are internally AC-coupled. The unused signal should be terminated to ground through a 50 Ω resistor.
6
Conexant
100646A
Conexant Proprietary
1/19/00
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