RF2514
Pin
1
Function
GND1
Description
Interface Schematic
Ground connection for the analog circuits, including TX buffer and output
amplifier. Internally connected to die flag. For best performance, keep
traces physically short and connect immediately to ground plane.
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. See electrical parameters for “high” and “low” thresholds.
2
PD
V C C
P D
Transmitter output. This output is an open collector and requires a pull-up
inductor for bias/matching and a tapped capacitor for matching.
3
TXOUT
TX OUT
RF IN
MOD IN
This pin is used to supply bias to the TX buffer amplifier.
4
5
VCC1
MOD IN
AM analog or digital modulation can be imparted to the carrier by an input See pin 3.
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.
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 con-
nected directly to this pin and returned to ground.
6
VCC2
Digital PLL ground connection.
7
8
GND2
VREF 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.
VCC
VREFP
See pin 1.
9
GND3
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 con-
nected to this pin and pin 11.
10
RESNTR-
RESNTR+
RESNTR-
LOOP FLT
4 kΩ
See pin 10.
11
12
RESNTR+
LOOP FLT
Output of the charge pump. An RC network from this pin to ground is used
to establish the PLL bandwidth.
VCC
LOOP FLT
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
4 of 18
Rev A5 DS040115
RFMD [ RF MICRO DEVICES ]
