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MC33170 Datasheet(PDF) 2 Page - ON Semiconductor

No. de Pieza. MC33170
Descripción  RF Amplifier Companion Chip for Dual-Band Cellular Subscriber Terminal
Descarga  16 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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MC33170 Datasheet(HTML) 2 Page - ON Semiconductor

 
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MC33170
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PIN DESCRIPTION
Pin No.
Pin Name
Function
Description
1
Band Selection
Selects the transmit band
A level high on this input selects the DCS chain. A zero selects the GSM
chain.
2
Tx Enable
Starts the power
A level high on this pin enables the DCS/GSM chain and establishes a
low–resistance link between pin 5 and 7
3
GSM–900
Biases the 900MHz section
When pin 1 is at zero and pin 2 goes high, the LDO voltage appears on
this pin (pin 14 is high)
4
DCS–1800
Biases the 1.8GHz section
When pin 1 is at one and pin 2 goes high, the LDO voltage appears on
this pin (pin 14 is high)
5
PA Start–up
Enables the PA power section
When pin 2 goes high, the battery voltage appears on this pin with a
700mA peak current capability (pin 14 is high)
6
Gnd
The IC ground
The IC ground
7
Vbat
The IC power supply
This pin is wired to the battery terminal. A 100nF decoupling capacitor is
recommended, depending on the supply impedance
8
LDO
Low DropOut regulator
This output requires a 100nF decoupling and is able to deliver up to
10mA continuous
9
NINV
Positive OPAMP input
The non–inverting OPAMP input
10
INV
Negative OPAMP input
The inverting OPAMP input
11
Vboost
Boost voltage from the PA
This pin connects to a boost voltage delivered by the RF PA. This boost
is necessary when driving an N–channel
12
Out
The OPAMP output
The output of the OPAMP/MOSFET driver pin
13
Negative Reg.
The PA negative clip
This pin clips the PA negative bias to —5V and prevents/authorizes the
modulation depending on its typical level :
<5.5V ––– 2.5V> OK
<1.3V ––– –3.5V> NOTOK
<–4.2V ––– –5V> OK
Max. clipping current is 5mA
14
Common Enable
Enables the whole IC
When high, this pin puts the IC in on–mode


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