RF2486 Ver la hoja de datos (PDF) - RF Micro Devices
Número de pieza
componentes Descripción
Fabricante
RF2486 Datasheet PDF : 8 Pages
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RF2486
Pin
20
21
22
23
24
Function
LNA OUT
GND8
VCC4
GND9
NC
Description
Interface Schematic
LNA output pin. This is an open-collector output. This pin is typically
connected to pin 22 through a bias/matching inductor. This inductor, in
conjunction with a series blocking/matching capacitor, forms a match-
ing network to the 50Ω image filter and provides bias (see application
schematic). The LNA’s IP3 may be increased 10dB by connecting pin
20 to VCC through the inductor. The LNA’s current then increases by
10mA. Other in-between IP3 versus ICC trade-offs may be made by
connecting resistance values between VCC and the matching inductor.
The two reference points for consideration are with 150Ω used, which
is what connection to pin 22 achieves, the input IP3 is +5.5dBm and the
LNA ICC is 5mA. Using no resistance, the input IP3 is +15.5 dBm and
the LNA ICC is 15 mA. Desired operating points in between these val-
ues may be roughly interpolated.
Same as pin 17.
LNA OUT
Output supply voltage for the LNA output (pin 20). This pin is typically
connected to pin 20 through a bias/matching inductor (see application
schematic). External RF bypassing is required. The trace length
between the pin and the bypass capacitor should be minimized. The
ground side of the bypass capacitor should connect immediately to
ground plane.
Same as pin 17.
See pin 2.
No connection. This pin may be grounded (recommended) or left open.
8
Application Schematic
1.96GHz, 210MHz IF
1
VCC
2
1 nF
22 pF
3
LNA2 IN
4
22 pF
5
6
7
VCC
8
9
1 nF
22 pF
10
1 kΩ
BUF ENBL
11
1 nF
22 pF
12
See evaluation
board
R2
24
22 pF
23
1.8 nH
22
2 pF
21
22 pF
20
SAW
Filter
19
22 pF
18
17
IF SAW
Filter
16
100 pF 1
470 nH
2
15
100 pF
470 nH
470 nH
14
VCC
LNA OUT
MIX IN
VCC
13
1 nF
22 pF 4.7 µF
LO IN
2.7 nH
LO OUT
8-108
Rev A7 010717
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