RF2418(Rec_A6) Ver la hoja de datos (PDF) - RF Micro Devices
Número de pieza
componentes Descripción
Fabricante
RF2418 Datasheet PDF : 10 Pages
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RF2418
Pin Function Description
Interface Schematic
10
GND
Same as pin 2.
11
RF IN
Mixer RF Input port. For a 50Ω match at 900MHz use a 15nH series
inductor. This pin is NOT internally DC-blocked. An external blocking
capacitor must be provided if the pin is connected to a device with DC
RF IN
present. A DC path to ground (i.e. an inductor or resistor to ground) is,
however, acceptable at this pin. If a blocking capacitor is required, a
value of 22pF is recommended.To minimize the mixer’s noise figure, it
is recommended to have a RF bandpass filter before this input. This will
prevent the noise at the image frequency from being converted to the
IF.
12
GND
Same as pin 2.
13
GND
Same as pin 2.
14
LNA OUT 50Ω output. Internally DC-blocked.
LNA OUT
Application Schematic
High Impedance Output Configuration
8
850 MHz
RF IN
10 nH
1
VDD
100 nF 47 pF
2
3
4
10pF
5
IF Filter, Hi Z
C1
IF OUT
VDD
6 BUFFER
7
L1
LNA
RF AMP
MIXER
14
13
12
15 nH
11
10
1 nF
9
4 pF
8
10 nH
Image Filter 50 Ω
LO IN
100 nF
L1 and C1 are picked to match the mixer's output impedance (4 kΩ II 10 pF) to the IF
filter's impedance, at the IF frequency. C1 also serves as a DC block, in case the IF filter
is not an open circuit at DC.
8-38
Rev A6 010717
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