RF7115_1 Datasheet, PDF (9/22 Pages) RF Micro Devices – QUAD-BAND GSM850/GSM900/DCS/PCS TRANSMIT MODULE

RF7115
Pin Function Description
Interface Schematic
1
VSENSE ^{Can provide two purposes:}
1. The current limiter can be set by adding a resistor to determine the set
point. When open, the current limiter feature is fully engaged and shorter
the current limiter is disabled.
2. A voltage proportional to the PA current can be detected and used as
feedback to the baseband.
See application note for further details.
2
GSM850/ ^{RF input to the GSM850/GSM900 band. This is a 50Ω input.}
GSM900 IN
3
B1
Control pin that together with B2 and B3 selects band of operation.
4
B2
Control pin that together with B1 and B3 selects band of operation.
5
VBATT
Power supply for the module. This should be connected to the battery ter-
minal using as wide a trace as possible.
6
B3
Control pin that together with B1 and B2 selects band of operation.
7
TX ENABLE ^{This signal enables the PA module for operation with a logic high. The}
switch is put in TX mode determined by B1, B2, and B3.
TX ENABLE
TX ON
8
VRAMP
VRAMP ramping signal from DAC. A simple RC filter may need to be con-
nected between the DAC output and the V_RAMP input depending on the
baseband selected.
9
DCS/PCS IN ^{DCS/PCS IN RF input to the DCS/PCS band. This is a 50Ω input.}
-
+
HB RF IN
10
GND
11
GND
12
GND
13
RX 1
RX 1 port of antenna switch. This is a 50Ω output.
Note that there will be a DC voltage present equal to V_BATT -0.5V.
14
RX 2
RX 2 port of antenna switch. This is a 50Ω output.
Note that there will be a DC voltage present equal to V_BATT -0.5V.
15
RX 3
RX 3 port of antenna switch. This is a 50Ω output.
Note that there will be a DC voltage present equal to V_BATT -0.5V.
Additional logic provided to improve isolation at 2f₀ of GSM band.
RX850
RX900
RX1800
Rev A0 DS060808
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