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PDF LTC4400-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4400-1 | |
| Descripción | RF Power Controllers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4400-w1w/wL.DTatCaSh4ee4t4U0.c0om-2
RF Power Controllers with
450kHz Loop BW and
45dB Dynamic Range
FEATURES
s RF Power Amplifier Control in ThinSOTTM Package
s Internal Schottky Diode Detector with > 45dB Range
s Wide Input Frequency Range:
300MHz to 2.7GHz (LTC4400-1)
300MHz to 2GHz (LTC4400-2)
s Autozero Loop Cancels Offset Errors and
Temperature Dependent Offsets
s Wide VCC Range: 2.7V to 6V
s Automatic Bandwidth Control Improves Low Power
Ramp Response
s Allows Direct Connection to Battery
s RF Output Power Set by External DAC
s Internal Frequency Compensation
s Rail-to-Rail Power Control Output
s Power Control Signal Overvoltage Protection
s Low Operating Current: 1mA
s Low Shutdown Current: 10µA
s Two Pole PCTL Input Filtering
s Low Profile (1mm) ThinSOT (LTC4400-1) and
8-Pin MSOP (LTC4400-2) Packages
U
APPLICATIO S
s GSM/GPRS Cellular Telephones
s PCS Devices
s Wireless Data Modems
s U.S. TDMA Cellular Phones
DESCRIPTIO
The LTC®4400-1 is a SOT-23 RF power controller for fast
turn-on RF power amplifiers operating in the 300MHz to
2.7GHz range. Examples include the Hitachi PF08109B,
PF08122B, PF08123B, PF08107B and RF Micro Devices
RF3108. For slow turn-on RF power amplifiers refer to the
LTC4401-1/LTC4401-2.
RF power is controlled by driving the RF amplifier power
control pin and sensing the resultant RF output power via
a directional coupler or capacitive tap. The RF input
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 RF power
amplifier is protected against high power control pin
voltages.
Internal and external offsets are cancelled over tempera-
ture by an autozero control loop, allowing accurate low
power programming. The shutdown feature disables the
part and reduces the supply current to <10µA.
A dual control channel version (LTC4400-2) is also
available in an 8-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
LTC4400-1 Dual Band Cellular Telephone Transmitter
Li-Ion
0.1µF
6
VCC
RF
LTC4400-1
4
SHDN
SHDN
VPCA
1
5
32
DAC
PCTL
GND
50Ω
BAND
SELECT
900MHz
INPUT
1.8GHz
INPUT
VPC
900MHz
OUTPUT
PA MODULE
1.8GHz
OUTPUT
0.4pF
4400 TA01
LTC4400-1 Detector Characteristics at
900MHz and 1800MHz
10000
TA = 25°C
VCC = 3.6V
1000
900MHz
100 1800MHz
10
1
–26 –22 –18 –14 –10 –6 –2 2 6 10 14 18
RF INPUT POWER (dBm)
4400 TA04
sn4400 4400fas
1
1 page  
BLOCK DIAGRA (LTC4400-1)
LTC4400-w1w/wL.DTatCaSh4ee4t4U0.c0om-2
68Ω
33pF
1
RF
GND 2
VCC
6
Li-Ion
RF IN
250Ω
GAIN
COMPRESSION
30k
28pF
30k
60µA
60µA
+
RF DET
–
22k
RF PA
50Ω
AUTOZERO
–
AZ
+
–
GM
+
+– 80mV
270kHz
FILTER
38k
51k VREF +
TXENB
+
CLAMP
+
CC BUFFER
–
30k
30k
VREF
VBG
10µs
DELAY
TXENB
33.4k
–
6k
CONTROL
12Ω
100Ω
5
VPCA
150k
43
SHDN
PCTL
NOTE: THE DIRECTIONAL COUPLER SHOWN IN THIS FIGURE MAY BE REPLACED
WITH A COUPLING CAPACITOR AND RESISTOR AS DESCRIBED IN APPLICATION
NOTE 91 “LOW COST COUPLING METHODS FOR RF POWER DETECTORS REPLACE
DIRECTIONAL COUPLERS”
LTC4400-1
4400-1 BD
sn4400 4400fas
5
5 Page 
LTC4400-w1w/wL.DTatCaSh4ee4t4U0.c0om-2
APPLICATIO S I FOR ATIO
This model (Figure 6) is being supplied to LTC users as an
aid to circuit designs. While the model reflects reasonably
close similarity to corresponding devices in low frequency
AC performance terms, its use is not suggested as a
replacement for breadboarding. Simulation should be
used as a forerunner or a supplement to traditional lab
testing.
Users should note very carefully the following factors
regarding this model: Model performance in general will
reflect typical baseline specs for a given device, and
certain aspects of performance may not be modeled fully.
While reasonable care has been taken in the preparation,
we cannot be responsible for correct application on any
and all computer systems. Model users are hereby notified
that these models are supplied “as is”, with no direct or
implied responsibility on the part of LTC for their operation
within a customer circuit or system. Further, Linear Tech-
nology Corporation reserves the right to change these
models without prior notice.
In all cases, the current data sheet information is your final
design guideline, and is the only performance guarantee.
For further technical information, refer to individual device
data sheets. Your feedback and suggestions on this model
is appreciated.
PCTL
CONTROL
AMPLIFER
RF POWER AMP
+ VPC
G1 G2
–
IFB LTC4400-X
RF
H1
H2
CONTROLLED
RF OUTPUT
POWER
RF DETECTOR
4400 F04
RF COUPLER
14dB to 20dB LOSS
Figure 4. Closed-Loop Block Diagram
Linear Technology Corporation hereby grants the users of
this model a nonexclusive, nontransferable license to use
this model under the following conditions:
The user agrees that this model is licensed from Linear
Technology and agrees that the model may be used,
loaned, given away or included in other model libraries as
long as this notice and the model in its entirety and
unchanged is included. No right to make derivative works
or modifications to the model is granted hereby. All such
rights are reserved.
This model is provided as is. Linear Technology makes
no warranty, either expressed or implied about the suit-
ability or fitness of this model for any particular purpose.
In no event will Linear Technology be liable for special,
collateral, incidental or consequential damages in con-
nection with or arising out of the use of this model. It
should be remembered that models are a simplification
of the actual circuit.
80
70
60
50
40
30
20
10
0
–10
–20
–30
–40
–50
–60
100
180
RLOAD = 2k
CLOAD = 33pF
160
140
120
PHASE
100
80
GAIN
60
40
20
0
–20
–40
–60
–80
–100
1k 10k 100k 1M 10M
FREQUENCY (Hz)
4400 F05
Figure 5. SPICE Model Open-Loop Gain and Phase
Characteristics from RF to VPCA, PCTL < 80mV
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4400-1.PDF ] | |
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