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DS1870 Datasheet

  • DS1870

  • LDMOS RF Power-Amplifier Bias Controller

  • 28頁

  • ETC

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Rev 0; 2/04
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鈥檚
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鈥檚 efficiency by using nonlinear compensa-
tion schemes that are not possible with conventional
biasing solutions.
Features
鈾?/div>
Two-Channel Solution for Programmable RF Bias
Control
鈾?/div>
The Potentiometer鈥檚 Position is Automatically
Updated to Compensate for the Ambient
Temperature and the Drain Voltage or Current
鈾?/div>
A Five-Channel, 13-Bit ADC Continuously
Monitors the Ambient Temperature, V
CC
, V
D
, I
D1,
and I
D2
鈾?/div>
Hi/Lo Alarms for Each ADC Channel can Trigger a
Fault Output
鈾?/div>
Nonvolatile Memory for the Device Settings,
Lookup Tables, and 32-Bytes of User Memory
鈾?/div>
I
2
C鈩?Compatible Serial Interface with Up to Eight
Devices on the Same Serial Bus
鈾?/div>
Single 5V Power Supply
鈾?/div>
Small 16-Pin TSSOP Package
鈾?/div>
-40擄C to +95擄C Operational Temperature Range
DS1870
Applications
Cellular Base Stations
Medical Equipment
Industrial Controls
Optical Transceivers
Ordering Information
I
2
C is a trademark of Philips Corp. Purchase of I
2
C compo-
nents of Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the
Philips I
2
C Patent Rights to use these components in an I
2
C
system, provided that the system conforms to the I
2
C Standard
Specification as defined by Philips.
PART
DS1870E-010
TEMP RANGE
-40擄C to +95擄C
PIN-PACKAGE
16 TSSOP
(173 mil)
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
TOP VIEW
1
2
3
4
5
6
7
8
L
1
W
1
W
2
L
2
I
D1
I
D2
V
D
GND
V
CC
H
COM
SDA
SCL
16
15
14
13
12
11
10
9
DS1870
A
2
A
1
A
0
FAULT
TSSOP (173 mil)
______________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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