
DS1870
LDMOS RF Power-Amplifier Bias
Controller
_____________________________________________________________________ 7
Typical Operating Characteristics (continued)
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
OUTPUT DRIFT (PPM/C)
-15
-10
-5
0
5
10
15
20
-20
POTENTIOMETER LOW TERMINAL VOLTAGE
vs. TEMPERATURE
DS1870 toc12
TEMPERATURE (°C)
8060-20 0 20 40-40 100
L1
L2
H
COM
= 5.0V
V
CC
CONVERSION ERROR
vs. SUPPLY VOLTAGE
DS1870 toc13
SUPPLY VOLTAGE (V)
ERROR (% FS)
5.04.54.03.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
3.0 5.5
DEFAULT V
CC
CALIBRATION
VD CONVERSION ERROR
vs. INPUT VOLTAGE
DS1870 toc14
INPUT VOLTAGE (V)
ERROR (% FS)
2.01.51.00.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 2.5
DEFAULT VD
CALIBRATION
ID1 CONVERSION ERROR
vs. INPUT VOLTAGE
DS1870 toc15
INPUT VOLTAGE (V)
ERROR (% FS)
0.40.30.20.1
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 0.5
DEFAULT ID1
CALIBRATION
ID2 CONVERSION ERROR
vs. INPUT VOLTAGE
DS1870 toc16
INPUT VOLTAGE (V)
ERROR (% FS)
0.40.30.20.1
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 0.5
DEFAULT ID2
CALIBRATION
POTENTIOMETER 1 AND 2
WIPER RESISTANCE vs. WIPER VOLTAGE
DS1870 toc09
WIPER VOLTAGE (V)
WIPER RESISTANCE (Ω)
4321
100
200
300
400
500
600
700
800
900
1000
0
05
H
COM
= 5.0V
POTENTIOMETER 1 AND 2
WIPER RESISTANCE vs. TEMPERATURE
DS1870 toc10
TEMPERATURE (°C)
RESISTANCE CHANGE FROM 25°C (PPM/C)
806020 400-20
100
200
300
400
500
600
700
800
900
1000
0
-40 100
H
COM
= 5V
WIPER VOLTAGE = 4V
POTENTIOMETER END-TO-END RESISTANCE
vs. TEMPERATURE
DS1870 toc11
TEMPERATURE (°C)
CHANGE FROM RESISTANCE AT 25°C (PPM/C)
8060-20 0 20 40
-150
-100
-50
0
50
100
150
200
-200
-40 100
R
POT2
+ R
S2
R
POT1
+ R
S1
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