RF2513
Pin
1
Function Description
Interface Schematic
This pin is connected directly to the reference oscillator transistor base.
OSC B2
OSC B1
OSC E
OSC B2
The intended reference oscillator configuration is a modified Colpitts.
An appropriate capacitor as chosen by the customer should be con-
nected between pin 1 and pin 2.
This pin is connected directly to the emitter of the reference oscillator
transistor. An appropriate capacitor as chosen by the customer should
be connected from this pin to ground.
See pin 1.
2
3
OSC E
This pin is connected directly to the reference oscillator transistor base. See pin 1.
The intended reference oscillator configuration is a modified Colpitts.
An appropriate capacitor as chosen by the customer should be con-
nected between pin 3 and pin 2.
OSC B1
This pin is used to power up or down the VCO and PLL. A logic high
(PLL ENABL>2.0V) powers up the VCO and PLL electronics. A logic
4
PLL ENABL
50 k
Ω
PLL ENABL
low (PLL ENABL<1.0V) powers down the PLL and VCO.
Ground connection for the PA buffer amp. Keep traces physically short
and connect immediately to ground plane for best performance.
5
6
GND1
VCC3
This pin is used to supply DC bias to the transmitter PA. A RF bypass
capacitor should be connected directly to this pin and returned to
ground. A 100pF capacitor is recommended for 915MHz applications.
A 220pF capacitor is recommended for 433MHz applications.
This pin is used to vary the transmitter output power. An output level
adjustment range greater than 12dB is provided through analog volt-
age control of this pin. DC current of the transmitter power amp ia also
reduced with output power. This pin MUST be low when the transmitter
is disabled.
7
LVL ADJ
40 k
Ω
LVL ADJ
400
4 kΩ
RF output pin for the transmitter electronics. TX OUT output impedance
is a low impedance when the transmitter is enabled. TX OUT is a high
impedance when the transmitter is disabled.
8
TX OUT
VCC
11
20
TX OUT
Ground connection for the Tx PA functions. Keep traces physically
short and connect immediately to ground plane for best performance.
9
GND2
VCC1
This pin is used to supply DC bias to the PA buffer amp. A RF bypass
capacitor should be connected directly to this pin and returned to
ground. A 100pF capacitor is recommended for 915MHz applications.
A 220pF capacitor is recommended for 433MHz applications.
10
Enables the transmitter circuits. TX ENABL>2.0V powers up all trans-
mitter functions. TX ENABL<1.0V turns off all transmitter functions
except the PLL functions.
11
TX ENABL
20 k
Ω
TX ENABL
40 k
Ω
Dual-modulus/Dual-divide prescaler output. The output can be inter-
faced to an external PLL IC for additional flexibility in frequency pro-
gramming.
12
13
PRESCL
OUT
PRESCL
OUT
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.
VREF P
Rev B8 010509
11-25
RFMD [ RF MICRO DEVICES ]
