RF2449 查看數據表（PDF） - RF Micro Devices
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RF2449 Datasheet PDF : 14 Pages
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RF2449
Preliminary
Pin Function Description
Interface Schematic
1
ENABLE 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
2
IP SET
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.
3
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.
4
LNA GAIN 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.
IP SET
IF SEL
LNA GAIN
5
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.
MIX GAIN
6
LNA IN LNA input pin.
LNA OUT
MIX GAIN
8
GND1B
7
VCC1
VCC pin for all circuits except the LO.
8
GND1B LNA ground pin.
See pin 6.
9
GND1A Package ground pin.
10
LNA OUT LNA output pin.
See pin 6.
11
ISET2
An external resistor connected to this pin sets the current of the pre-
amp and the mixer.
12
ISET1
An external resistor connected to this pin sets the current of the LNA
when IP SET is high (see pin 2).
13
GND3B Ground pin for pre-amp circuit.
VCC2
14
MIX IN
Mixer pre-amp input pin.
15
GND3A Ground pin for the mixer circuits.
16
IF1+
First differential output pin for the first mixer.
MIX IN
See pin 13.
GND3B
IF1-
IF1+
8-78
Rev A4 001016
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