|
|
PDF LTC4403-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4403-1 | |
| Descripción | Multiband RF Power Controllers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC4403-1 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
LTC4403-w1w/wL.DTatCaSh4ee4t4U0.c3om-2
Multiband RF Power
Controllers for EDGE/TDMA
FEATURES
s Supports AM Modulation in EDGE/TDMA (ANSI-136)
Applications
s Single Output RF Power Amplifier Control
(LTC4403-1)
s Dual Output RF Power Amplifier Control (LTC4403-2)
s Internal Schottky Diode Detector with >40dB Range
s Wide Input Frequency Range: 300MHz to 2.4GHz
s Autozero Loop Cancels Offset Errors and
Temperature Dependent Offsets
s Wide VIN Range: 2.7V to 6V
s Allows Direct Connection to Battery
s RF Output Power Set by External DAC
s Internal Frequency Compensation
s Rail-to-Rail Power Control Outputs
s Low Operating Current: 1mA
s Low Shutdown Current: < 10µA
s PCTL Input Filter
s Available in a 8-Pin MSOP Package (LTC4403-1)
and 10-Pin MSOP (LTC4403-2)
U
APPLICATIO S
s Multiband GSM/GPRS/EDGE Cellular
Telephones
s PCS Devices
s Wireless Data Modems
s U.S. TDMA Cellular Phones
DESCRIPTIO
The LTC®4403-2 is a multiband RF power controller for
RF power amplifiers operating in the 300MHz to 2.4GHz
range. The LTC4403-2 has two outputs to control dual TX
PA modules with two control inputs. An internal sample
and hold circuit enables the LTC4403-2 to be used with
AM modulation via the carrier or PA supply. The input
voltage range is optimized for operation from a single
lithium-ion cell or 3× NiMH.
RF power is controlled by driving the RF amplifier power
control pins and sensing the resultant RF output power.
The RF sense voltage is peak detected using an on-chip
Schottky diode. This detected voltage is compared to the
DAC voltage at the PCTL pin to control the output power.
The LTC4403-1 is a single output RF power controller
with identical performance to the LTC4403-2. The
LTC4403-1 has one output to control a single TX PA or
dual TX PA module with a single control input and is
available in an 8-pin MSOP package.
Internal and external offsets are cancelled over tempera-
ture by an autozero control loop. The shutdown feature
disables the part and reduces the supply current to
< 10µA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
LTC4403-2 Multiband EDGE Cellular Telephone Transmitter
Li-Ion
0.1µF
DAC
BSEL
VHOLD
SHDN
LTC4403-2
1
VIN
9
BSEL
8
VHOLD
7
SHDN
RF
VPCA
VPCB
GND
6
PCTL
GND
10
2
3
4
5
850MHz/
900MHz
50Ω
RF PA
DIPLEXER
0.4pF
± 0.05pF
1.8GHz /
1.9GHz
RF PA
4403 TA01
4403f
1
1 page  
LTC4403-w1w/wL.DTatCaSh4ee4t4U0.c3om-2
APPLICATIONS INFORMATION
Operation
The LTC4403-1/-2 single/dual band RF power controller
integrates several functions to provide RF power control
over frequencies ranging from 300MHz to 2.4GHz. These
functions include an internally compensated amplifier to
control the RF output power, an autozero section to cancel
internal and external voltage offsets, an RF Schottky diode
peak detector and amplifier to convert the RF feedback
signal to DC, a multiplexer to switch the controller output
to either VPCA or VPCB, a VPCA/B overvoltage clamp, com-
pression and a bandgap reference.
Band Selection
The LTC4403-2 is designed for multiband operation. The
BSEL pin will select output VPCA when low and output
VPCB when high. For example, VPCA could be used to drive
an 850MHz/900MHz channel and VPCB a 1.8GHz/1.9GHz
channel. BSEL must be established before the part is
enabled. The LTC4403-1 can be used to drive a single RF
channel or dual channel with integral multiplexer.
Control Amplifier
The control amplifier supplies the power control voltage to
the RF power amplifier. A portion (typically – 19dB for low
frequencies and –14dB for high frequencies) of the RF
output voltage is coupled into the RF pin, to close the gain
control loop. When a DAC voltage is applied to PCTL, the
amplifier quickly servos VPCA or VPCB positive until the
detected feedback voltage applied to the RF pin matches
the voltage at PCTL. This feedback loop provides accurate
RF power control. VPCA or VPCB are capable of driving a
6mA load current and 100pF load capacitor.
RF Detector
The internal RF Schottky diode peak detector and ampli-
fier convert the coupled RF feedback voltage to a low
frequency voltage. This voltage is compared to the DAC
voltage at the PCTL pin by the control amplifier to close
the RF power control loop. The RF pin input resistance is
typically 250Ω and the frequency range of this pin is
300MHz to 2400MHz. The detector demonstrates excel-
lent efficiency and linearity over a wide range of input
power. The Schottky detector is biased at about 60µA and
drives an on-chip peak detector capacitor of 28pF.
Autozero
An autozero system is included to improve power pro-
gramming accuracy over temperature. This section can-
cels internal offsets associated with the Schottky diode
detector and control amplifier. External offsets associated
with the DAC driving the PCTL pin are also cancelled.
Offset drift due to temperature is cancelled between each
burst. The maximum offset allowed at the DAC output is
limited to 400mV. Autozeroing is performed after SHDN
is asserted high. An internal delay of typically 9µs enables
the VPCA/B output after the autozero has settled. When the
part is enabled, the autozero capacitors are held and the
VPCA or VPCB pin is connected to the buffer amplifier
output. The hold droop voltage of typically < 1µV/ms
provides for accurate offset cancellation.
Filter
There is a 270kHz filter included in the PCTL path. This
filter is trimmed at test.
Modes of Operation
Shutdown: The part is in shutdown mode when SHDN is
low. VPCA and VPCB are held at ground and the power
supply current is typically 10µA.
Enable: When SHDN is asserted high the part will auto-
matically calibrate out all offsets. This takes about 9µs and
is controlled by an internal delay circuit. After 9µs VPCA or
VPCB will step up to the starting voltage of 450mV. The
user can then apply the ramp signal. The user should wait
at least 11µs after SHDN has been asserted high before
applying the ramp. The DAC should be settled 2µs after
asserting SHDN high.
Hold: When the VHOLD pin is low, the RF power control
feedback loop is closed and the LTC4403-X servos the
VPCA/VPCB pins according to the voltages at the PCTL and
RF inputs. When the VHOLD pin is asserted high, the RF
power control feedback loop is opened and the power
control voltage at VPCA or VCPB is held at its present level.
Generally, the VHOLD pin is asserted high after the power
up ramp has been completed and the desired RF output
power has been achieved. The power control voltage is
then held at a constant voltage during the EDGE modula-
tion time. After the EDGE modulation is completed and
prior to power ramping down, the VHOLD pin is set low.
4403f
5
5 Page 
LTC4403-w1w/wL.DTatCaSh4ee4t4U0.c3om-2
TYPICAL APPLICATIO
Dual Band Cellular Telephone Transmitter
68Ω
DIRECTIONAL RF POWER MODULE
DIPLEXER COUPLER
WITH MUX
RF OUT1
900MHz
VCC
PWR
CTRL
50Ω RF OUT2 BAND
1800MHz SELECT
RF IN1 RF IN2
VIN
Li-Ion LTC4403-1
33pF
18
VIN RF
27
VPCA VHOLD VHOLD
36
GND SHDN SHDN
45
GND PCTL
DAC
4403 TA03
900MHz 1800MHz
PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 ± 0.127
(.035 ± .005)
0.254
(.010)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.53 ± 0.152
(.021 ± .006)
DETAIL “A”
1.10
(.043)
MAX
0.42 ± 0.038
(.0165 ± .0015)
TYP
0.65
(.0256)
BSC
RECOMMENDED SOLDER PAD LAYOUT
0.18
(.007)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.86
(.034)
REF
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
8 7 65
0.52
(.0205)
REF
4.90 ± 0.152
0.127 ± 0.076 (.193 ± .006)
(.005 ± .003)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
MSOP (MS8) 0603
1 234
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 ± 0.127
(.035 ± .005)
0.254
(.010)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.53 ± 0.152
(.021 ± .006)
1.10
DETAIL “A”
(.043)
MAX
0.305 ± 0.038
(.0120 ± .0015)
TYP
0.50
(.0197)
BSC
RECOMMENDED SOLDER PAD LAYOUT
0.18
(.007)
SEATING
PLANE 0.17 – 0.27
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
(.007 – .011)
TYP 0.50
(.0197)
2. DRAWING NOT TO SCALE
BSC
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.86
(.034)
REF
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
10 9 8 7 6
0.497 ± 0.076
(.0196 ± .003)
REF
0.127 ± 0.076
(.005 ± .003)
4.90 ± 0.152
(.193 ± .006)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
MSOP (MS) 0603
12345
4403f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC4403-1.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC4403-1 | Multiband RF Power Controllers | Linear Technology |
| LTC4403-1 | Multiband RF Power Controllers | Linear Technology |
| LTC4403-2 | Multiband RF Power Controllers | Linear Technology |
| LTC4403-2 | Multiband RF Power Controllers | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |