DS1870

LDMOS RF Power-Amplifier Bias Controller

Industry's First Integrated LDMOS Power-Amplifier Controller Monitor

Data Sheet (Rev. 2)
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Overview

  • Two-Channel Solution for Programmable RF Bias Control
  • The Potentiometer's Position is Automatically Updated to Compensate for the Ambient Temperature and the Drain Voltage or Current
  • A Five-Channel, 13-Bit ADC Continuously Monitors the Ambient Temperature, VCC, VD, ID1, and ID2
  • Hi/Lo Alarms for Each ADC Channel can Trigger a Fault Output
  • Nonvolatile Memory for the Device Settings, Lookup Tables, and 32-Bytes of User Memory
  • I²C-Compatible Serial Interface with Up to Eight Devices on the Same Serial Bus
  • Single 5V Power Supply
  • Small 16-Pin TSSOP Package
  • -40°C to +95°C Operational Temperature Range

The DS1870 is a dual-channel bias controller targeted toward class AB LDMOS RF power-amplifier applications. It uses lookup tables (LUTs) to control 256-position potentiometers based on the amplifier's temperature and drain voltage or current (or other external monitored signal). With its internal temperature sensor and multichannel A/D converter (ADC), the DS1870 provides a cost-effective solution that improves the amplifier's efficiency by using nonlinear compensation schemes that are not possible with conventional biasing solutions.

Applications

  • Cellular Base Stations
  • Industrial Controls
  • Medical Equipment
  • Optical Transceivers
DS1870
LDMOS RF Power-Amplifier Bias Controller
DS1870: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 5

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Analog to Digital Converters (ADCs) 1
DS1859
NOT RECOMMENDED FOR NEW DESIGNS Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors
Digital Potentiometers (DigiPOTs) 2
DS1845
NOT RECOMMENDED FOR NEW DESIGNS Dual NV Potentiometer and Memory
DS1855
NOT RECOMMENDED FOR NEW DESIGNS Dual Nonvolatile Digital Potentiometer and Secure Memory
Interface Transceivers & Isolators 1
DS1852
Optical Transceiver Diagnostic Monitor
Matched Resistors & Transistors 3
DS1847
NOT RECOMMENDED FOR NEW DESIGNS Dual Temperature-Controlled NV Variable Resistor
DS1848
NOT RECOMMENDED FOR NEW DESIGNS Dual Temperature-Controlled NV Variable Resistor & Memory
DS1858
NOT RECOMMENDED FOR NEW DESIGNS Dual Temperature-Controlled Resistors with Three Monitors
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