RF2451PCBA 데이터 시트보기 (PDF) - RF Micro Devices

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RF2451PCBA

3V LOW NOISE AMPLIFIER

RF Micro Devices 

RF2451

Pin Function Description

Interface Schematic

1

RF OUT RF output pin. Bias for the LNA is provided through this pin, hence it

should be connected to VCC through an inductor.

2

ISET

This pin sets the current for the device. A resistor to ground of 1kΩ pro-

vides a current of 17.5mA. The condition for optimal IP3 is to use the

internal current setting option and leave this pin open (no connect).

3

VCC

Power supply for the bias circuits.

4

ENABLE Power down control. This is a CMOS input. When this pin is CMOS

“high” the device is enabled. When the level is CMOS “low” the device

is shut off and a controlled attenuator is turned on.

5

IPSET

This pin selects the internal current setting when CMOS level “low”, and

the external current setting when this pin is CMOS level “high”. The cur-

rent is set to 2.8mA using the internal current setting, and can be up to

20mA using the external current setting.

S 6

GND2

Ground connection for the bias circuits.

7

GND1

Ground connection for the LNA. Keep traces physically short and con-

nect immediately to ground plane for best performance.

N 8

RF IN

RF input pin. This pin is not internally DC blocked and requires an

NSOeeTUFpgOraRdeNd PEroWducDt ERFS2I3G71 externalblockingcapacitor.

4

Rev A8 000822

4-249

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