11-41
RF2514
Rev A5 040115
Pin
Function
Description
Interface Schematic
1GND1
Ground connection for the analog circuits, including TX buffer and out-
put amplifier. Internally connected to die flag. For best performance,
keep traces physically short and connect immediately to ground plane.
2PD
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. See electrical parameters for “high” and “low”
thresholds.
3TXOUT
Transmitter output. This output is an open collector and requires a pull-
up inductor for bias/matching and a tapped capacitor for matching.
4VCC1
This pin is used to supply bias to the TX buffer amplifier.
5
MOD 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.
See pin 3.
6VCC2
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.
7GND2
Digital PLL ground connection.
8VREF P
Bias voltage reference pin for bypassing the prescaler and phase
detector. The bypass capacitor should be of appropriate size to provide
filtering of the reference crystal frequency and be connected directly to
this pin.
9GND3
See pin 1.
10
RESNTR-
The RESNTR pins are used to supply DC voltage to the VCO, as well
as to tune the center frequency of the VCO. Equal value inductors
should be connected to this pin and pin 11.
11
RESNTR+
See pin 10.
12
LOOP FLT
Output of the charge pump. An RC network from this pin to ground is
used to establish the PLL bandwidth.
V
CC
PD
TX OUT
MOD IN
RF IN
VREFP
V
CC
RESNTR-
RESNTR+
LOOP FLT
4 k
Ω
LOOP FLT
V
CC
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