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Rev 2; 2/06
ATION
EVALU
AVAILA
KIT
BLE
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
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
? I 2 C-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
DS1870E-010+
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
PIN-PACKAGE
16 TSSOP
(173 mils)
16 TSSOP
(173 mils)
+Denotes lead-free package.
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
TOP VIEW
1
2
3
4
L 1
W 1
W 2
L 2
V CC
H COM
SDA
SCL
16
15
14
13
5
6
7
8
I D1
I D2
V D
GND
DS1870
A 2
A 1
A 0
FAULT
12
11
10
9
TSSOP (173 mils)
______________________________________________ Maxim Integrated Products
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.
1
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DS1873T+T&R 功能描述:ADC / DAC多通道 SFP+ Ctrl w/Analog RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40
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DS1874 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface
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