CAT5132 Datasheet, PDF (3/14 Pages) Catalyst Semiconductor – 15 Volt Digitally Programmable Potentiometer (DPP) with 128 Taps and 2-wire Interface

CAT5132
Table 4. POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
R_POT
R_POT
R_POT
R_TOL
Parameter
Potentiometer Resistance (100 kW)
Potentiometer Resistance (50 kW)
Potentiometer Resistance (10 kW)
Potentiometer Resistance Tolerance
Power Rating
Test Conditions
25°C
Min
Typ
Max Units
100
kW
50
kW
10
kW
±20
%
50
mW
I_W
Wiper Current
R_W Wiper Resistance
V_TERM
RES
Voltage on R_W, R_H or R_L
Resolution
I_W = ±1 mA @ V+ = 12 V
I_W = ±1 mA @ V+ = 8 V
GND = 0 V; V+ = 8 V to 16 V
±3
mA
70
150
W
110
200
W
GND
V+
V
0.78
%
A_LIN Absolute Linearity (Note 3)
V_W(n)(actual) − V_{W(n)(expected)} (Notes 6, 7)
±1
LSB
(Note 5)
R_LIN Relative Linearity (Note 4)
V_W(n+1) − [V_W(n) + LSB] (Notes 6, 7)
±0.5
LSB
(Note 5)
TC_RPOT Temperature Coefficient of R_POT
(Note 2)
±300
ppm/°C
TC_Ratio Ratiometric Temperature Coefficient
(Note 2)
30 ppm/°C
C_H/C_L/C_W Potentiometer Capacitances
(Note 2)
10/10/25
pF
fc
Frequency Response
R_POT = 50 kW
0.4
MHz
2. This parameter is tested initially and after a design or process change that affects the parameter.
3. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
4. Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiometer.
5. LSB = (R_{HM −} R_LM)/127; where R_HM and R_LM are the highest and lowest measured values on the wiper terminal.
6. n = 1, 2, ..., 127
7. V⁺ @ R_H; 0 V @ R_L; V_W measured @ R_W with no load.
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