Preliminary
RF2449
Pin
1
Function Description
Interface Schematic
This pin is used to enable or disable the RF2449. A logic high (>2.0V)
enables the circuitry. A logic low (<1.0V) disables the circuitry.
ENABLE
ENABLE
Controls the setting of the LNA current. A logic low (<1.0V) selects the
internal resistance (49.5kΩ), resulting in an LNA current of 3.5mA. A
logic high (>2.0V) selects the external resistance at pin 12.
2
3
4
5
6
IP SET
IP SET
IF SEL
Determines which IF port is active. A logic low (<1.0V) activates IF1
and deactivates IF2. A logic high (>2.0V) activates IF2 and deactivates
IF1.
IF SEL
LNA GAIN
MIX GAIN
LNA IN
Controls the bypass feature of the LNA. A logic low (<1.0V) selects the
bypass mode. A logic high (>2.0V) turns on the LNA.
LNA GAIN
MIX GAIN
Controls the bypass feature of the mixer pre-amp. A logic low (<1.0V)
selects the bypass mode. A logic high (>2.0V) turns on the pre-amp.
LNA input pin.
LNA OUT
MIX GAIN
8
GND1B
VCC pin for all circuits except the LO.
LNA ground pin.
7
8
9
10
11
VCC1
GND1B
GND1A
LNA OUT
ISET2
See pin 6.
See pin 6.
Package ground pin.
LNA output pin.
An external resistor connected to this pin sets the current of the pre-
amp and the mixer.
An external resistor connected to this pin sets the current of the LNA
when IP SET is high (see pin 2).
12
13
ISET1
Ground pin for pre-amp circuit.
GND3B
VCC2
MIX IN
GND3B
Mixer pre-amp input pin.
See pin 13.
14
15
16
MIX IN
GND3A
IF1+
Ground pin for the mixer circuits.
First differential output pin for the first mixer.
IF1-
IF1+
8-78
Rev A4 001016
RFMD [ RF MICRO DEVICES ]
