RF2451 datasheet(3/6 Pages) RFMD

3 / 6 page

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RF2451

Rev A8 000822

Function

Description

Interface Schematic

1RF OUT

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

should be connected to VCC through an inductor.

ISET

This pin sets the current for the device. A resistor to ground of 1k

Ω 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).

3VCC

Power supply for the bias circuits.

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.

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.

6GND2

Ground connection for the bias circuits.

7GND1

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

nect immediately to ground plane for best performance.

8RF IN

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

external blocking capacitor.

RF2451 Datasheet(PDF) 3 Page - RF Micro Devices