link to page 4 link to page 4 link to page 4 link to page 4 link to page 4 link to page 4 link to page 4 link to page 4 link to page 4 AD5227ELECTRICAL CHARACTERISTICS 10 kΩ, 50 kΩ, 100 kΩ versions: VDD = 3 V ± 10% or 5 V ± 10%, VA = VDD, VB = 0 V, −40°C < TA < +105°C, unless otherwise noted. Table 2. Parameter SymbolConditionsMinTyp1Max Unit DC CHARACTERISTICS RHEOSTAT MODE Resistor Differential Nonlinearity2 R-DNL RWB, A = no connect −0.5 ±0.15 +0.5 LSB Resistor Integral Nonlinearity2 R-INL RWB, A = no connect −1 ±0.3 +1 LSB Nominal Resistor Tolerance3 ∆RAB/RAB −20 +20 % Resistance Temperature Coefficient (∆RAB/RAB)/∆T × 106 35 ppm/°C Wiper Resistance RW VDD = 2.7 V 100 250 Ω VDD = 2.8 V to 5.5 V 50 200 Ω DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE Resolution N 6 Bits Integral Nonlinearity3 INL −1 ±0.1 +1 LSB Differential Nonlinearity3, 4 DNL −0.5 ±0.1 +0.5 LSB Voltage Divider Temperature Coefficient (∆VW/VW)/∆T × 106 Midscale 5 ppm/°C Full-Scale Error VWFSE ≥+31 steps from midscale −1.2 −0.5 0 LSB −40°C < TA < +60°C, −1 −0.5 0 LSB VDD = 2.8 V to 5.5 V Zero-Scale Error VWZSE ≤−32 steps from midscale 0 0.5 1.2 LSB −40°C < TA < +60°C, 0 0.5 1 LSB VDD = 2.8 V to 5.5 V RESISTOR TERMINALS Voltage Range5 VA, B, W With respect to GND 0 VDD V Capacitance A, B6 CA, B f = 1 MHz, measured to 140 pF GND Capacitance W6 CW f = 1 MHz, measured to 150 pF GND Common-Mode Leakage ICM VA = VB = VW 1 nA DIGITAL INPUTS (CS, CLK, U/D) Input Logic High VIH 2.4 5.5 V Input Logic Low VIL 0 0.8 V Input Current II VIN = 0 V or 5 V ±1 μA Input Capacitance6 CI 5 pF POWER SUPPLIES Power Supply Range VDD 2.7 5.5 V Supply Current IDD VIH = 5 V or VIL = 0 V, 0.4 3 μA VDD = 5 V Power Dissipation7 PDISS VIH = 5 V or VIL = 0 V, 17 μW VDD = 5 V Power Supply Sensitivity PSSR VDD = 5 V ± 10% 0.01 0.05 %/% DYNAMIC CHARACTERISTICS6, 8, 9 Bandwidth −3 dB BW_10 k RAB = 10 kΩ, midscale 460 kHz BW_50 k RAB = 50 kΩ, midscale 100 kHz BW_100 k RAB = 100 kΩ, midscale 50 kHz Total Harmonic Distortion THD VA = 1 V rms, RAB = 10 kΩ, 0.05 % VB = 0 V dc, f = 1 kHz Adjustment Settling Time tS VA = 5 V ± 1 LSB error 1 μs band, VB = 0, measured at VW Resistor Noise Voltage eN_WB RWB = 5 kΩ, f = 1 kHz 14 nV/√Hz Footnotes on the next page. Rev. B | Page 3 of 16 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY ELECTRICAL CHARACTERISTICS INTERFACE TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION PROGRAMMING THE DIGITAL POTENTIOMETERS Rheostat Operation Potentiometer Mode Operation DIGITAL INTERFACE TERMINAL VOLTAGE OPERATION RANGE POWER-UP AND POWER-DOWN SEQUENCES LAYOUT AND POWER SUPPLY BIASING APPLICATIONS MANUAL CONTROL WITH TOGGLE AND PUSHBUTTON SWITCHES MANUAL CONTROL WITH ROTARY ENCODER ADJUSTABLE LED DRIVER ADJUSTABLE CURRENT SOURCE FOR LED DRIVER ADJUSTABLE HIGH POWER LED DRIVER AUTOMATIC LCD PANEL BACKLIGHT CONTROL 6-BIT CONTROLLER CONSTANT BIAS WITH SUPPLY TO RETAIN RESISTANCE SETTING OUTLINE DIMENSIONS ORDERING GUIDE
