RF2494 Просмотр технического описания (PDF) - RF Micro Devices

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производитель

RF2494

HIGH FREQUENCY LNA/MIXER

RF Micro Devices 

RF2494

Preliminary

Pin

13

14

15

16

Function

LNA OUT

VCC4

Description

RF signal output for external 50Ω filtering.The use of a filter here is

optional but does provide for lower noise floor and better out-of-band

rejection.

Supply voltage for the LNA. This pin should be bypassed with a 10 pF

capacitor to ground as close to the pin as possible. The shunt induc-

tance from this pin to ground via the supply decoupling must be tuned

to match the LNA output to 50Ω at the desired operating frequency.

Interface Schematic

See pin 14.

Microstrip

VCC4 -16 dB

P2

LNA IN

BIAS

EXTERNAL

DECOUPLING

P15

LNA OUT

GS

LNA IN

LNA gain control. When GAIN SEL is >VCC- 300mV, LNA gain is at 10

dB. When GAIN SEL is <300mV, the LNA gain is -6dB.

This pin is NOT internally DC blocked. An external blocking capacitor

must be provided if the pin is connected to a device with DC present. If

a blocking capacitor is required, a value of 2pF is recommended.

See pin 14.

See pin 14.

P1

GAIN SEL

8

8-56

Rev A0 010730

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