RF2418PCBA Ver la hoja de datos (PDF) - RF Micro Devices

Número de pieza

componentes Descripción

Fabricante

RF2418PCBA

LOW CURRENT LNA/MIXER

RF Micro Devices 

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

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.

8-24

Rev A7 060203

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