RF2514
Pin
13
Function
LD FLT
Description
This pin is used to set the threshold of the lock detect circuit. A shunt
capacitor should be used to set an RC time constant with the on-chip
series 1k resistor. The time constant should be approximately 10 times the
reference period.
Interface Schematic
V
CC
LD FLT
14
DIV CTRL
Logic “High” input selects divide-by-64 prescaler. Logic “Low” input selects
divide-by-32 prescaler.s
D IV CTRL
V
CC
15
OSC B
This pin is connected directly to the reference oscillator transistor base.
The intended reference oscillator configuration is a modified Colpitts. A
68pF capacitor should be connected between pin 15 and pin 16.
OSC B
V
CC
OSC E
16
Die
Flag
OSC E
GND
ESD
This pin is connected directly to the emitter of the reference oscillator tran- See pin 15.
sistor. A 33pF capacitor should be connected from this pin to ground.
Exposed die flag is centered and measures 1.5mmx1.5mm
(0.059in.x0.059in.). For best results, provide a solder pad for the flag and
connect immediately to ground plane (see evaluation board layout). Inter-
nally connected to pins 1 and 9.
This diode structure is used to provide electrostatic discharge protection to
3kV using the Human body model. The following pins are protected: 1, 2,
4-9, 12-14. The die flag is not protected.
V
CC
Rev A5 DS040115
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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