RF2516
Pin
1
Function Description
Interface Schematic
This pin is connected directly to the reference oscillator transistor base.
OSC B
VCC
The intended reference oscillator configuration is a modified Colpitts. A
68pF capacitor should be connected between pin 1 and pin 2.
OSC B
OSC E
This pin is connected directly to the emitter of the reference oscillator
transistor. A 33pF capacitor should be connected from this pin to
ground.
See pin 1.
2
3
OSC E
PD
VCC
Power Down control for all circuitry. When this pin is a logic “low” all cir-
cuits are turned off. When this pin is a logic “high”, all circuits are oper-
ating normally. A “high” is V . Diodes shown in the interface
schematic provide 3kV electrostatic discharge (ESD) protection using
the human body model.
CC
PD
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) protection 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) pro-
tection 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)
protection 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 amplifi-
ers 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, phase detector, and charge pump. An IF bypass capacitor
should be connected 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.
See pin 7.
9
VCC2
GND2
Digital PLL ground connection. Diodes shown in the interface sche-
matic provide 3kV electrostatic discharge (ESD) protection using the
human body model.
10
VCC
GND
Rev A17 060712
11-3
RFMD [ RF MICRO DEVICES ]
