參數(shù)資料
型號(hào)： RF2498
廠(chǎng)商： RF MICRO DEVICES INC
元件分類(lèi)： 無(wú)繩電話(huà)/電話(huà)
英文描述： TRI-BAND/QUAD-MODE CDMA/GPS LOW NOISE AMPLIFIER/MIXER
中文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQCC32
封裝： 5 X 5 MM, PLASTIC, QFN-32
文件頁(yè)數(shù)： 11/20頁(yè)
文件大小： 723K
代理商： RF2498
8-311
RF2498
Rev A3 030711
ISET Pins
ISET1 sets the internal reference voltage for the bias control circuits to all functional blocks. An external resistor of 5.1k
to ground is required. We do not recommend adjusting this resistor value. This resistor is pulled out to allow for a higher
precision off chip value and not as a significant tuning adjustment.
ISET2 sets the DC current through the LNAs in all bands when IPSET is high. Higher resistance to ground results in
lower current through the LNA. Increasing the LNA current will improve the IIP3 of the LNA and slightly increase gain in
all modes. NF typically will get worse as you increase current. Increasing the LNA current in one mode, i.e. Cellular, will
also increase the LNA current for the high IPSET state for PCS and the GPS LNAs as well.
ISET3 sets the DC current through the mixer and mixer preamplifier for all bands. Higher resistance to ground results in
lower current. Lower current will improve mixer NF but will degrade IIP3. Mixer and the mixer preamp gain is not signifi-
cantly changed with current.
Pin
28
Function
GPS MIX IN
Type Description
AI
GPS mixer RF single-end input.
Interface Schematic
29
VCC1
P
DC supply for internal reference, logic control, cellular mixer
preamp, and GPS mixer preamp (PCS mixer preamp has its’
own DC supply, PCS_RFA_VCC). External bypass capacitor
between 1nF and 47nF required.
Resistor for internal voltage reference setting. Recommended
value 5.1k
.
Resistor to ground sets the LNA current in boost mode (all
three LNAs). Higher resistance results in lower current.
Resistor to ground sets preamp and mixer currents in all
bands. Higher resistance results in lower currents.
Ground connection. The backside of the package should be
soldered to a top side ground pad which is connected to the
ground plane with multiple vias.
30
ISET1
AO
31
ISET2
AO
32
ISET3
AO
Pkg
Base
GND
P
Legend:
DI=Digital Input from Baseband Chip
AI=Analog Input
AO=Analog Output
P=V
CC
or GND
GPS MIX IN
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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