DS1870_06 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – LDMOS RF Power-Amplifier Bias Controller

Rev 2; 2/06
EVAALVUAAILTAIOBNLEKIT
LDMOS RF Power-Amplifier Bias
Controller
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
*Purchase of I²C components of Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I²C Patent Rights to use these com-
ponents in an I²C system, provided that the system conforms
to the I²C Standard Specification as defined by Philips.
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
Monitors the Ambient Temperature, V_CC, V_D, I_D1,
and I_D2
♦ 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
Ordering Information
PART
DS1870E-010
TEMP RANGE
-40°C to +95°C
PIN-PACKAGE
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.
Pin Configuration
TOP VIEW
1
L₁
2
W₁
3
W₂
4
L₂
5
I_D1
6
I_D2
7
V_D
8
GND
DS1870
V_CC
16
H_COM
15
SDA 14
SCL 13
A₂
12
A₁
11
A₀
10
FAULT 9
TSSOP (173 mils)
______________________________________________ Maxim Integrated Products 1
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.