RF2919 datasheet(6/18 Pages) RFMD

6 / 18 page

11-148

RF2919

Rev A12 001113

Function

Description

Interface Schematic

LOOP FLT

Output of the charge pump, and input to the VCO control. An RC net-

work from this pin to ground is used to establish the PLL bandwidth.

OSC B

This pin is connected directly to the reference oscillator transistor base.

The intended reference oscillator configuration is a modified Colpitts. A

100pF capacitor should be connected between pin 30 and pin 31.

OSC E

This pin is connected directly to the emitter of the reference oscillator

transistor. A 100pF capacitor should be connected from this pin to

ground.

See pin 30.

This pin is used to power up or down the RF2919. A logic high (PWR

DWN >2.0 V) powers up the receiver and PLL. A logic low (PWR DWN

<1.0 V) powers down circuit to standby mode.

ESD

This diode structure is used to provide electrostatic discharge protec-

tion to 3kV using the Human body model. The following pins are pro-

tected: 1, 3, 5, 7-19, 21-24, 27-31.

LOOP FLT

OSC E

OSC B

RF2919 Datasheet(PDF) 6 Page - RF Micro Devices