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15
FN8170.3
August 29, 2006
POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
(2) Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a
potentiometer. It is a measure of the error in step size.
(3) MI = RTOT / 255 or (RH - RL) / 255, single pot
(4) During power-up VCC > VH, VL, and VW.
(5) n = 0, 1, 2, …,255; m =0, 1, 2, …, 254.
Symbol
Parameter
Limits
Test Conditions
Min.
Typ.
Max.
Unit
End to end resistance
±20
%
Power rating
50
mW
25°C, each pot
IW
Wiper current
±3
mA
RW
Wiper resistance
250
Ω
Wiper current =
± 1mA,
V+ = 3V; V- = -3V
RW
Wiper resistance
150
Ω
Wiper current =
± 1mA,
V+ = 3V; V- = -3V
Vv+
Voltage on V+ pin
X9260
+4.5
+5.5
V
X9260-2.7
+2.7
+5.5
Vv-
Voltage on V- pin
X9260
-5.5
-4.5
V
X9260-2.7
-5.5
-2.7
VTERM
Voltage on any VH/RH or VL/RL
pin
V-
V+
V
Noise
-120
dBV
Ref: 1kHz
Resolution (4)
0.4
%
Absolute linearity (1)
±1MI(3)
Vw(n)(actual) - Vw(n)(expected)
Relative linearity (2)
±0.6
MI(3)
Vw(n + 1) - [Vw(n) + MI]
Temperature coefficient
±300
ppm/°C
Ratiometric Temperature
Coefficient
±20
ppm/°C
CH/CL/CW Potentiometer Capacitances
10/10/25
pF
See Circuit #3
X9260