General Description

The DS1870 is a dual-channel bias controller targeted

toward class AB LDMOS RF power-amplifier applica-

tions. It uses lookup tables (LUTs) to control 256-posi-

tion 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 compensa-

tion schemes that are not possible with conventional

biasing solutions.

Applications

Cellular Base Stations

Medical Equipment

Industrial Controls

Optical Transceivers

Features

♦ 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

♦ 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

Devices on the Same Serial Bus

♦ Single 5V Power Supply

♦ Small 16-Pin TSSOP Package

♦ -40°C to +95°C Operational Temperature Range

LDMOS RF Power-Amplifier Bias

Controller

______________________________________________

Maxim Integrated Products

1

TSSOP (173 mils)

1

2

3

4

5

6

7

89

10

11

12

13

14

15

16

TOP VIEW

GND

FAULT

SCL

SDA

DS1870

Pin Configuration

Ordering Information

Rev 2; 2/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

DS1870E-010

-40°C to +95°C

16 TSSOP

(173 mils)

DS1870E-010+

-40°C to +95°C

16 TSSOP

(173 mils)

+

Denotes lead-free package.

Typical Operating Circuit appears at end of data sheet.

Inc., or one of its sublicensed Associated Companies, conveys