Datasheet

AD8400/AD8402/AD8403
Rev. E | Page 15 of 32
WIPER RESISTANCE (Ω)
FREQUENCY
60
48
0
40.0 42.5 65.045.0 47.5 50.0 52.5 55.0 57.5 60.0 62.5
36
24
12
SS = 184 UNITS
V
DD
=4.5V
T
A
=25°C
01092-015
Figure 15. 100 kΩ Wiper-Contact-Resistance Histogram
TEMPERATURE (°C)
NOMIN
A
L RESISTANCE (k
Ω
)
10
8
0
–75 –50 125
–25 0 25 50 75 100
6
4
2
R
AB
(END-TO-END)
R
WB
(WIPER-TO-END)
CODE = 80
H
R
AB
=10kΩ
0
1092-016
Figure 16. Nominal Resistance vs. Temperature
CODE (Decimal)
POTENTIOMETER MODE TEMPCO (ppm/
°
C)
70
60
–10
0 32 16064 96 128
30
20
10
0
50
40
192 224 256
V
DD
=5V
T
A
=–40°C/+85°C
V
A
=2V
V
B
=0V
01092-017
Figure 17. ΔV
WB
/ΔT Potentiometer Mode Tempco
CODE (Decimal)
RHEOSTAT MODE TEMPCO (ppm/
°
C)
700
600
–100
0 32 16064 96 128
300
200
100
0
500
400
192 224 256
V
DD
=5V
T
A
= –40°C/+85°C
V
A
= NO CONNECT
R
WB
MEASURED
01092-018
Figure 18. ΔR
WB
/ΔT Rheostat Mode Tempco
500ns5V
20mV
R
W
(20mV/DIV)
CS
(5V/DIV)
TIME 500ns/DIV
01092-019
Figure 19. One Position Step Change at Half-Scale (Code 7F
H
to 80
H
)
FREQUENCY (Hz)
GAIN (dB)
6
0
–54
10 1M100 1k 10k 100k
–6
–12
–48
–18
–24
–30
–36
–42
CODE = FF
80
40
20
10
08
04
02
01
T
A
=25°C
01092-020
Figure 20. 10 kΩ Gain vs. Frequency vs. Code
(See Figure 43)