Datasheet AD5227 (Analog Devices) - 8

AD5227 1 20 V 10k
Ω
DD = 5.5V 50k
Ω
15 100k
Ω °
C) VDD = 5.5V 10
μ
A) 5 NT ( 0 CURRE LY –5 P P U S –10 RHEOSTAT MODE TEMPCO (ppm/ –15 0.1
04419-0-015
–20
04419-0-018
–40 –20 0 20 40 60 80 100 0 8 16 24 32 40 48 56 64 TEMPERATURE (
°
C) CODE (Decimal)
Figure 12. Supply Current vs. Temperature Figure 15. Rheostat Mode Tempco ΔRWB/ΔT vs. Code
1 20 V 10k
Ω
DD = 5.5V
°
C) 50k
Ω
RAB = 100k
Ω
15 100k
Ω
)
Ω
VDD = 5.5V (k 10 AB , R 5 TEMPCO (ppm/ TANCE 0 IS RAB = 50k
Ω
S R MODE –5 TE –10 NTIOME NOMINAL RE R TE AB = 10k
Ω
–15 O P 0.1
04419-0-016
–20
04419-0-019
–40 –20 0 20 40 60 80 100 0 8 16 24 32 40 48 56 64 TEMPERATURE (
°
C) CODE (Decimal)
Figure 13. Nominal Resistance vs. Temperature Figure 16. Potentiometer Mode Tempco ΔRWB/ΔT vs. Code
120 REF LEVEL /DIV MARKER 461 441.868Hz 0dB 6.0dB MAG (A/R) –8.957dB 6 V T DD = 2.7V A = 25
°
C 100 0 VDD = 5.5V V ) A = 50mV rms
Ω
32 STEPS ( –6 W 80 16 STEPS , R –12 8 STEPS –18 60 TANCE 4 STEPS IS S VDD = 5.5V –24 dB 2 STEPS RE 40 R –30 1 STEP E –36 WIP 20 –42 –48 0
04419-0-017
–40 –20 0 20 40 60 80 100 –54
04419-0-042
TEMPERATURE (
°
C) 1k 10k 100k 1M START 1 000.000Hz STOP 1 000 000.000Hz
Figure 14. Wiper Resistance vs. Temperature Figure 17. Gain vs. Frequency vs. Code, RAB = 10 kΩ Rev. B | Page 8 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