RF3158 Просмотр технического описания (PDF) - RF Micro Devices
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RF3158 Datasheet PDF : 26 Pages
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RF3158
Pin Function Description
Interface Schematic
20
GND
Ground.
22
GND
Ground.
23
GND
Main ground pad in center of part. This pad should be tied to the main
ground plane with as little loss as possible for optimum linearity.
Dual Mode Operation
MODE VMODE
RF INPUT
VRAMP
TX ENABLE
GSM
Low FIXED
Analog voltage that proportionally regulates
collector voltage. Controls output power
level. (GSM Burst Ramp Control)
High (Normal)
Low (Isolation)
EDGE
High Ramped burst from Variable Gain Ampli- Analog voltage that proportionally regulates
fier or Source (GSM Burst Ramp Con-
base bias. Controls amplifier bias current.
trol)
High (Normal)
Low (Isolation)
Note: When VMODE is low (GMSK mode), the voltage on VRAMP is used to regulate the PA collector voltage which directly controls the output
power. When VMODE is high (8PSK mode), the PA collector voltage is regulated to 3.6V, and the supply for the PA base bias can be adjusted via
the VRAMP pin to optimize current drain for low or high power ranges. In addition, in 8PSK mode, the first stage of the low band PA is bypassed
to decrease gain, but in high band, the PA operates with all stages.
Pin Out
HB_RFIN 1
22
20 19 18 HB_RFOUT
BAND_SEL 2
17
TX_EN 3
16
VBATT 4
VMODE 5
VRAMP 6
LB_RFIN 7
8
23
15
MODULE
GND
14
13
10 11 12 LB_RFOUT
Note: view from top of part.
Pins 8, 10, 11, 13, 14, 15, 16, 17, 19, 20, 22 are
connected to pin 23 on the module. It is
recommended that these pins be connected to
module ground on the PCB as well.
12 of 26
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A2 DS070615
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