The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.
MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020
SMD = Standard Microcircuit Drawing
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 amplified 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 output indicates which direction the LDMOS gate bias voltage 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 current 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 Intersil Digital Potentiometers can be controlled via a twowire serial bus.
Key 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
IDQ Sensing and Tracking
Programmable Instrumentation Amplifier to Scale Wide Range of IDQ
Programmable Gate Bias Driver
All Programmable settings are Nonvolatile
All Settings Recalled at Power-up.
28V Maximum VDD
2 Wire Interface for Programming Bias Setting and Optimizing IDQ 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, Pointto- multipoint, and other RF power transmission systems
