RF2919
Pin
29
Function
LOOP FLT
Description
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.
Interface Schematic
V
CC
LOOP FLT
30
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 B
OSC E
31
32
OSC E
PD
ESD
This pin is connected directly to the emitter of the reference oscillator
transistor. A 100pF capacitor should be connected from this pin to
ground.
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.
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.
See pin 30.
V
CC
11
TRANSCEIVERS
11-148
Rev A12 001113
RFMD [ RF MICRO DEVICES ]
