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| 型号： | X9470V24I |
| 厂商： | Intersil |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC BIAS CTRLR RF PA 24-TSSOP |
| 标准包装： | 62 |
| RF 型： | CDMA，GSM，EDGE |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
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PRELIMINARY Data Sheet
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March 8, 2005
X9470
FN8204.0
RF Power Amplifier (PA) Bias Controller
FEATURES
? Programmable Bias Controller IC for Class A
and AB LDMOS Power Amplifiers
? Adaptive System on Chip Solution
? Bias Current Calibration to better than ±4%
using Reference Trim DCP
? Automatic Bias Point Tracking and Calibration
— I DQ Sensing and Tracking
—Programmable Instrumentation Amplifier to
Scale Wide Range of I DQ
—Programmable Gate Bias Driver
—All Programmable settings are Nonvolatile
—All Settings Recalled at Power-up.
? 28V Maximum V DD
? 2 Wire Interface for Programming Bias Setting
and Optimizing I DQ Set Point
? Bias Level Comparator
? Shutdown Control pin for PA Signal
? Slave address to allow for multiple devices
? 24-pin TSSOP Package
? Applications: Cellular Base Stations (GSM,
UMTS, CDMA, EDGE), TDD applications, Point-
to-multipoint, and other RF power transmission
systems
TYPICAL APPLICATION
DESCRIPTION
The Intersil X9470 RF PA Bias Controller contains all of
the necessary analog components to sense the PA
drain current through an external sense resistor and
automatically control the gate bias voltage of an
LDMOS PA. The external sense resistor voltage is am-
plified by an instrumentation amplifier and the output of
the amplifier along with an external reference voltage is
fed to the inputs of a comparator. The comparator out-
put indicates which direction the LDMOS gate bias volt-
age will move in the next calibration cycle. System
calibration is accomplished by enabling the X9470 and
providing a clock to the SCL pin. The LDMOS drain cur-
rent can be maintained constant over temperature and
aging changes by periodic calibration. The VOUT pin
can be used to monitor the average power by tracking
the drain current. Up to eight X9470 or additional Inter-
sil Digital Potentiometers can be controlled via a two-
wire serial bus.
A2
INC/DEC
RW REF RH REF RL REF
R REF
AGND
V OUT
V+
V DD
V SENSE+
C BULK
A1
A0
Comparator
V REF
VP
Instrumentation
Amplifier
? V
V SENSE–
R SENSE
SDA
I2C
interface
VREF
control
choke
SCL
Control &
Status Registers
Vbias
control
R BIAS
+
–
V BIAS
FILTER
RF
out
RF PA in
EEPROM
Matching
RF Impedance
VCC
VSS
CS
RH BIAS RW BIAS RL BIAS
SHDN
Class A Example
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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