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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2400 MHz Digital Spread Spectrum Transceiver
RF109
Recommendations on Layout and Implementation _______
A typical applications schematic is shown in Figure 5.
Decouple all Vcc pins as close as possible to the supply pin.
All ground pins should have minimum trace inductance to
ground. If a ground plane cannot be provided right at the pins,
the vias to the ground plane should be placed as close to the
pins as possible. There should be one via for each ground pin. If
the ground plane is at the bottom layer, it is recommended to
have two vias in parallel for each ground pin.
Connect all no connect (NC) pins to the ground.
VCC1 (pin 6), VCC2 (pin 7), VCC3 (pin 25), and VCC4 (pin 31)
should be connected to the common Vcc supply through
individual decoupling networks.
RTXD should be chosen to provide a typical baseband spread
spectrum signal level of 0.10 Vp-p, to the TXD pin (pin 8).
The routing of the trace to pin 3 (FREF) is very important to
minimize the coupling of the reference clock (9.6 MHz) into the
LO. The FREF trace should be well isolated from all other
traces, preferably by grounded strips on either side of the trace.
All traces from the VCO to pins 38 and 39 should be as short as
possible with a characteristic impedance of 50 Ω.
Exposed Paddle Soldering ____________________________
The RF109 48-pin TQFP package has an exposed (metal)
paddle on the bottom. The footprint dimensions of the exposed
paddle are shown in Figure 6. The printed circuit board should
provide through hole connections to the ground plane to ground
the exposed paddle. The solder mask opening should have the
same size as the exposed paddle. All relevant manufacturing
considerations for this type of package should be taken into
account.
ESD Sensitivity______________________________________
The RF109 is a static-sensitive electronic device. Do not operate
or store near strong electrostatic fields. Take proper
Electrostatic Discharge (ESD) precautions.
VBAT
SYNTHEN
3V REGULATOR
CTRL VCC
GND1 GND2
BYP OUT
0.056µF
47
pF
1000 + 47
pF - µF
VREG
10Ω
0.01
µF
8.2
pF
8.2pF
47nF
STROBE
8.2pF
CLK
8.2pF
FREF
8.2pF
DATA
8.2pF
VBAT 10Ω
RXEN
47nF
8.2pF
8.2pF
0.01µF
LNAATTN
47nF
8.2pF
TXD
8.2
pF
RTXD
3.6kΩ
402Ω
82µH
820pF
820pF
1500pF
1500pF
1.8pF
1.0pF
1
2
3
4
5
6
7
8
9
10
11
12
Rgmc
825Ω
402Ω
12pF
12pF
8.2
pF
10Ω
0.047
µF
390pF
RF109
Rmod
1.2kΩ
2200
pF
8.2
pF
10kΩ
0.01µF
100Ω
VCO SHIELD AREA
VREG
1000
pF
BALUN
12pF
10kΩ
75 Ω
91Ω
330pF
VCO
OUT VCC
91Ω
GND GND
8.2pF
12pF
NC TUNE
10Ω
36
35
Cservo
0.082µF
34
33
Cservo
0.082µF
32
8.2pF
31
30
29
28
27
26
25
0.047µF
0.047
µF
470Ω
VBAT
LNAIN RFO1 RFO2 TXEN PS1 PS2 AGC
RXQ- RXQ+ RXI- RXI+
Figure 5. Typical Application Diagram – RF109
100646A
Conexant
5
1/19/00
Conexant Proprietary
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