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X9470V24I Datasheet

  • X9470V24I

  • RF Power Amplifier (PA) Bias Controller

  • 24頁

  • INTERSIL   INTERSIL

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廬
X9470
Data Sheet
March 8, 2005
FN8204.0
PRELIMINARY
RF Power Amplifier (PA) Bias Controller
FEATURES
鈥?Programmable Bias Controller IC for Class A
and AB LDMOS Power Amplifiers
鈥?Adaptive System on Chip Solution
鈥?Bias Current Calibration to better than 鹵4%
using Reference Trim DCP
鈥?Automatic Bias Point Tracking and Calibration
鈥?I
DQ
Sensing and Tracking
鈥擯rogrammable Instrumentation Amplifier to
Scale Wide Range of I
DQ
鈥擯rogrammable Gate Bias Driver
鈥擜ll Programmable settings are Nonvolatile
鈥擜ll Settings Recalled at Power-up.
鈥?28V Maximum V
DD
鈥?2 Wire Interface for Programming Bias Setting
and Optimizing I
DQ
Set Point
鈥?Bias Level Comparator
鈥?Shutdown Control pin for PA Signal
鈥?Slave address to allow for multiple devices
鈥?24-pin TSSOP Package
鈥?Applications: Cellular Base Stations (GSM,
UMTS, CDMA, EDGE), TDD applications, Point-
to-multipoint, and other RF power transmission
systems
TYPICAL APPLICATION
INC/DEC
A2
A1
Comparator
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.
RW
REF
RH
REF
RL
REF
R
REF
V
REF
AGND
V
OUT
V+
V
DD
V
SENSE+
鈭哣
V
SENSE鈥?/div>
C
BULK
R
SENSE
A0
VP
I2C
interface
Vbias
control
+
鈥?/div>
V
BIAS (Unbuffered)
Control &
Status Registers
Instrumentation
Amplifier
VREF
control
R
BIAS
V
BIAS
FILTER
RF
out
choke
SDA
SCL
RF PA in
Matching
RF Impedance
EEPROM
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.

X9470V24I 產(chǎn)品屬性

  • 62

  • RF/IF 和 RFID

  • RF 電源控制器 IC

  • -

  • CDMA，GSM，EDGE

  • -

  • -

  • 24-TSSOP（0.173"，4.40mm 寬）

  • 24-TSSOP 裸露焊盤

  • -

X9470V24I相關(guān)型號PDF文件下載

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  • 英文版
    RF Power Amplifier (PA) Bias Controller
    XICOR
  • 英文版
    RF Power Amplifier (PA) Bias Controller
    INTERSIL
  • 英文版
    RF Power Amplifier (PA) Bias Controller
    INTERSIL
  • 英文版
    RF Power Amplifier (PA) Bias Controller
    XICOR
  • 英文版
    RF Power Amplifier (PA) Bias Controller
    INTERSIL [...
  • 英文版
    RF Power Amplifier (PA) Bias Controller
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