RF2705PCBA-41X View Datasheet(PDF) - RF Micro Devices
Part Name
Description
MFG CO.
'RF2705PCBA-41X' PDF : 24 Pages View PDF
RF2705
Pin
13
Function
RF OUT
LB N
Description
Differential low band PA driver amplifier output.
This output is intended for low band (GSM850/900) operation and
drives a differential SAW.
A bypass mode allows the low band PA driver amplifier’s input to be
switched between the signal from the modulator and the signal applied
at LOLB. This enables a GMSK-modulated signal on the LOLB input to
be switched into the RF signal path.
The output is an open collector. The outputs are matched off-chip.
Interface Schematic
VCC VCC
VCC
RF OUT LB P
RF OUT LB N
14
RF OUT Complementary differential low band PA driver amplifier output.
LB P
See pin 13.
See pin 13.
15
RF OUT Differential high band PA Driver amplifier output.
HB N
This output is intended for DCS1800/PCS1900 band operation.
A bypass mode allows the high band PA driver amplifier’s input to be
switched between the signal from the modulator and the signal applied
at LOHB. This enables a GMSK-modulated DCS1800/PCS1900 signal
on the LOHB input to be switched into the RF signal path.
The output is an open collector. The outputs are matched off-chip.
VCC
VCC VCC
RF OUT HB P
RF OUT HB N
16
RF OUT Complementary differential high band PA driver amplifier output.
HB P
See pin 15.
17
RF OUT Differential high band PA driver amplifier output.
WB N
This output is intended for wide band (W-CDMA) applications.
The output is an open collector. The output are matched off-chip.
See pin 15.
VCC
VCC VCC
RF OUT WB P
RF OUT WB N
18
RF OUT Complementary differential wideband PA driver amplifier output.
WB P
See pin 17.
19
GND
Ground.
20
MODE A Mode control pin. See the Logic Truth table.
CMOS Logic inputs: Logic 0=0V to 0.4V; Logic 1=1.4V to VCC.
21
VCC1
Supply for modulator, VGA and PA driver amplifiers.
See pin 17.
See pin 6.
VCC1
LO Quadrature
Generator and
Buffers
GND1
Rev A4 041026
5-127
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