Preliminary
11-37
RF2516
Rev A10 010613
11
Pin
Function
Description
Interface Schematic
1OSC 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 1 and pin 2. Diodes
shown in the interface schematic provide 3kV electrostatic discharge
(ESD) protection using the human body model.
2OSC 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. Diodes shown in the interface schematic provide 3kV electro-
static discharge (ESD) protection using the human body model.
See pin 1.
3PD
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 VCC. Diodes shown in the interface
schematic provide 3kV electrostatic discharge (ESD) protection using
the human body model.
4GND
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.
5TXOUT
Transmitter output. This output is an open collector and requires a pull-
up inductor for bias/matching and a tapped capacitor for matching.
6GND1
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.
See pin 4.
7VCC1
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.
8MOD IN
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.
9VCC2
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.
10
GND2
Digital PLL ground connection. Diodes shown in the interface sche-
matic provide 3kV electrostatic discharge (ESD) protection using the
human body model.
See pin 4.
OSC E
V
CC
OSC B
V
CC
PD
GND
V
CC
TX OUT
MOD IN
RF IN
VCC1
V
CC
1k
Ω
MOD IN
TX OUT
V
CC
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