User guide

MAX5128
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
_______________________________________________________________________________________ 7
-18
-14
-12
-10
-8
-6
-4
-2
0
0.1 1 10 100 1000
WIPER RESPONSE
vs. FREQUENCY
MAX5128 toc19
FREQUENCY (kHz)
GAIN (dB)
-16
V
CC
= 5V
WIPER = MIDSCALE
THD+N vs. FREQUENCY
MAX5128 toc20
FREQUENCY (kHz)
THD+N (%)
101
0.001
0.01
0.1
1
10
0.0001
0.1 100
V
CC
= 5V
WIPER = MIDSCALE
FILTER BANDWIDTH = 80kHz
1µs/div
TAP-TO-TAP SWITCHING TRANSIENT
V
W
20mV/div
AC-COUPLED
UP
2V/div
MAX5128 toc21
H = V
CC
L = GND
FROM MIDSCALE
C
W
= 20pF
0
200
100
400
300
500
600
MAX5128 toc22
R
W
(Ω)
WIPER RESISTANCE vs. CODE
0243612 48 60 72 84 96 108 120
CODE
10µs/div
MIDSCALE WIPER TRANSIENT
AT POWER-ON
V
CC
2V/div
OUTPUT
W
2V/div
MAX5128 toc23
Typical Operating Characteristics (continued)
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5128 toc17
DIGITAL INPUT VOLTAGE (V)
I
DD
(µA)
4.54.03.53.02.52.01.51.00.5
1
10
100
1000
0.1
0 5.0
V
CC
= 5V
0
200
600
400
800
1000
-40 10-15 35 60 85
WIPER RESISTANCE
vs. TEMPERATURE
MAX5128 toc18
TEMPERATURE (°C)
R
W
(Ω)
V
CC
= 5V
WIPER = MIDSCALE