RF2516
Pin
1
Function
OSC B
Description
Interface Schematic
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 1 and pin 2.
VCC
OSC B
OSC E
This pin is connected directly to the emitter of the reference oscillator tran- See pin 1.
sistor. A 33pF capacitor should be connected from this pin to ground.
2
3
OSC E
PD
VCC
Power Down control for all circuitry. When this pin is a logic “low” all circuits
are turned off. When this pin is a logic “high”, all circuits are operating nor-
mally. A “high” is V . Diodes shown in the interface schematic provide
PD
CC
3kV electrostatic discharge (ESD) protection using the human body model.
Ground connection for the TX OUT amp. Keep traces physically short and
connect immediately to ground plane for best performance. Diodes shown
in the interface schematic provide 3kV electrostatic discharge (ESD) pro-
tection using the human body model.
4
5
GND
Transmitter output. This output is an open collector and requires a pull-up
inductor for bias/matching and a tapped capacitor for matching.
TXOUT
TX OUT
RF IN
MOD IN
Ground connection for the TX output buffer amplifier. Diodes shown in the
interface schematic provide 3kV electrostatic discharge (ESD) protection
using the human body model.
6
7
GND1
VCC1
VCC
This pin is used to supply bias to the TX buffer amplifier. Diodes shown in
the interface schematic provide 3kV electrostatic discharge (ESD) protec-
tion using the human body model.
VCC1
AM analog or digital modulation can be imparted to the carrier by an input
to this pin. An external resistor is used to bias the output amplifiers through
this pin. The voltage at this pin must not exceed 1.1V. Higher voltages may
damage the device. Diodes shown in the interface schematic provide 3kV
electrostatic discharge (ESD) protection using the human body model.
8
MOD IN
VCC
TX OUT
1 kΩ
MOD IN
This pin is used to supply DC bias to the VCO, crystal oscillator, pre-scaler, See pin 7.
phase detector, and charge pump. An IF bypass capacitor should be con-
nected directly to this pin and returned to ground. Diodes shown in the
interface schematic provide 3kV electrostatic discharge (ESD) protection
using the human body model.
9
VCC2
Digital PLL ground connection. Diodes shown in the interface schematic
provide 3kV electrostatic discharge (ESD) protection using the human body
model.
10
GND2
VCC
GND
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Rev A17 DS060712
3 of 22
RFMD [ RF MICRO DEVICES ]
