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



Wiper current =

 1mA,

V+ = 3V; V- = -3V

RW

Wiper resistance

150



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