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
Ordering Information
PART
DS1870E-010
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
PIN-PACKAGE
16 TSSOP
(173 mils)
16 TSSOP
(173 mils)
*Purchase of I
2
C components of Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms
to the I
2
C Standard Specification as defined by Philips.
DS1870E-010+
+Denotes
lead-free package.
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 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.
LDMOS RF Power-Amplifier Bias
Controller
DS1870
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
, H
COM
, SDA, and SCL Pins Relative to
Ground ...............................................................-0.5V to +6.0V
Voltage Range on A
0
, A
1
, A
2
, FAULT, V
D
, I
D1
, I
D2
Relative to
Ground. ...................-0.5V to V
CC
+ 0.5V, not to exceed +6.0V
Voltage Range on L0, L1, W0, and W1 Relative to
Ground .................-0.5V to H
COM
+ 0.5V, not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +95°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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