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LTC4400-2EMS8 Datasheet

  • LTC4400-2EMS8

  • RF Power Controllers with 450kHz Loop BW and 45dB Dynamic Ra...

  • 16頁(yè)

  • LINER

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LTC4400-1/LTC4400-2
RF Power Controllers with
450kHz Loop BW and
45dB Dynamic Range
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
RF Power Amplifier Control in ThinSOT
TM
Package
Internal Schottky Diode Detector with > 45dB Range
Wide Input Frequency Range:
300MHz to 2.7GHz (LTC4400-1)
300MHz to 2GHz (LTC4400-2)
Autozero Loop Cancels Offset Errors and
Temperature Dependent Offsets
Wide V
CC
Range: 2.7V to 6V
Automatic Bandwidth Control Improves Low Power
Ramp Response
Allows Direct Connection to Battery
RF Output Power Set by External DAC
Internal Frequency Compensation
Rail-to-Rail Power Control Output
Power Control Signal Overvoltage Protection
Low Operating Current: 1mA
Low Shutdown Current: 10碌A(chǔ)
Two Pole PCTL Input Filtering
Low Profile (1mm) ThinSOT (LTC4400-1) and
8-Pin MSOP (LTC4400-2) Packages
The LTC
廬
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 <10碌A(chǔ).
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.
APPLICATIO S
s
s
s
s
GSM/GPRS Cellular Telephones
PCS Devices
Wireless Data Modems
U.S. TDMA Cellular Phones
TYPICAL APPLICATIO
LTC4400-1 Detector Characteristics at
900MHz and 1800MHz
10000
T
A
= 25擄C
V
CC
= 3.6V
PCTL REFERENCED DETECTOR
OUTPUT VOLTAGE (mV)
LTC4400-1 Dual Band Cellular Telephone Transmitter
50鈩?/div>
Li-Ion
0.1碌F
6
1
BAND
SELECT
900MHz
OUTPUT
V
CC
LTC4400-1
RF
0.4pF
SHDN
4
SHDN
V
PCA
5
V
PC
900MHz
INPUT
1.8GHz
INPUT
3
DAC
PCTL
GND
2
PA MODULE
1.8GHz
OUTPUT
1
鈥?6 鈥?2 鈥?8 鈥?4 鈥?0 鈥? 鈥? 2 6 10 14 18
RF INPUT POWER (dBm)
4400 TA01
4400 TA04
U
1000
900MHz
100
1800MHz
10
U
U
sn4400 4400fas
1

LTC4400-2EMS8 產(chǎn)品屬性

  • LTC4400-1/2

  • 50

  • RF/IF 和 RFID

  • RF 電源控制器 IC

  • -

  • 手機(jī)，GSM，GPRS，PCS，無線調(diào)制解調(diào)器，TDMA

  • 300MHz ~ 2GHz

  • 雙輸出

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）

  • 8-MSOP

  • 管件

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