RF2311PCBA datasheet(3/6 Pages) RFMD

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4-83

RF2311

Rev C3 010228

Function

Description

Interface Schematic

1VCC

Power supply pin. An external bypass capacitor is recommended. The

total supply current is shared between this pin and pin 8 (through the

inductor).

See pin 8.

2GND

Ground connection. Keep traces physically short and connect immedi-

ately to ground plane for best performance.

3GND

Same as pin 2.

4RF IN

RF input pin. This pin is NOT internally DC blocked. A DC blocking

capacitor, suitable for the frequency of operation, should be used in

most applications. DC coupling of the input is not allowed, because this

will override the internal feedback loop and cause temperature instabil-

ity.

See pin 8.

5GND

Same as pin 2.

6GND

Same as pin 2.

7GND

Same as pin 2.

8RF OUT

RF output pin. Because DC is present on this pin, a DC blocking capac-

itor, suitable for the frequency of operation, should be used in most

applications. The DC voltage on this pin is typically 2.4V. Alternatively,

power supply may be connected to this pin. A series resistor and induc-

tor should be used, in which case the L should be large enough to

present a high impedance at the lowest operating frequency, and the R

should be (VCC - 2.4) / I, where I is the desired device current (between

8mA and 20mA).

RF OUT

RF IN

VCC

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