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RF7115
Rev A0 DS060808
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Pin
Function
Description
Interface Schematic
1VSENSE
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/
GSM900 IN
RF input to the GSM850/GSM900 band. This is a 50
Ω input.
3B1
Control pin that together with B2 and B3 selects band of operation.
4B2
Control pin that together with B1 and B3 selects band of operation.
5VBATT
Power supply for the module. This should be connected to the battery ter-
minal using as wide a trace as possible.
6B3
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.
8
VRAMP
VRAMP ramping signal from DAC. A simple RC filter may need to be con-
nected between the DAC output and the VRAMP 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.
10
GND
11
GND
12
GND
13
RX 1
RX 1 port of antenna switch. This is a 50
Ω output.
Note that there will be a DC voltage present equal to VBATT -0.5V.
14
RX 2
RX 2 port of antenna switch. This is a 50
Ω output.
Note that there will be a DC voltage present equal to VBATT -0.5V.
15
RX 3
RX 3 port of antenna switch. This is a 50
Ω output.
Note that there will be a DC voltage present equal to VBATT -0.5V.
Additional logic provided to improve isolation at 2f0 of GSM band.
TX ENABLE
TX ON
+
-
HB RF IN
RX850
RX900
RX1800
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