CXG1121TN Ver la hoja de datos (PDF) - Sony Semiconductor
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CXG1121TN Datasheet PDF : 7 Pages
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Application Note (1)
Operating from Regulated Supplies between 3V and 2.7V
Logic Lines
CXG1121TN
8 Tx1
6 Tx2
ANT
CXG1121TN 11
4 Rx1
2 Rx2
13
VDD
Additional components
C: 0603 CAP µF∗2
R: 200R
D: Low Turn-on voltage diode
∗1
Timeslot
waveform
VDD between
5.7V and 4.5V
during Tx
C
D
R
Regulated supply
between 3V and 2.7V
Technique
Allows use of CXG1121TN SP4T in handsets with regulated supplies between 3V and 2.7V.
The CXG1121TN is for 5V nominal battery voltage but works well down to a VDD of 4.5V.
This technique is only necessary for Tx modes.
Fundamentally, the timeslot waveform is added to the supply voltage to give a VDD between 5.7V and 4.5V
(depending on supply) during Tx modes.
This technique is suitable for up to 4 consecutive Tx timeslots (i.e.GPRS Class 12).
∗1 This waveform may be taken from the PA ramping input (or drain supply in case of drain power control) or
via the Tx ON/OFF logic.
∗2 Minimum and recommended value of capacitance C depends on GPRS class and is given by the following
table.
Number of consecutive
Tx timeslots
1
2
4
Minimum and recommended
value of capacitance C (µF)
1.0
2.0
2.0
–5–
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