Datasheet AD7796, AD7797 (Analog Devices) - 10

AD7796/AD7797 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 60 2.0 1.5 40 1.0 0.5 20 V) V) 0 (µ (µ 0 –0.5 –1.0 –20 –1.5 –40 –2.0 0 100 200 300 400 500 600 700 800 900 1000
006
0 100 200 300 400 500 600 700 800 900 1000
008
SAMPLES SAMPLES
06083- 06083- Figure 6. AD7797 Noise (VREF = AVDD, Update Rate = 16.7 Hz) Figure 8. AD7797 Noise (VREF = AVDD, Update Rate = 4.17 Hz)
17.5 35 15.0 30 12.5 25 NCE 10.0 NCE 20 7.5 15 CCURRE CCURRE O O 5.0 10 2.5 5 0 0 8388485 8388550 8388600 8388650 8388700 8388744
007
8388553 8388580 8388600 8388620 8388640 8388662
009
CODE CODE
06083- 06083- Figure 7. AD7797 Noise Distribution Histogram Figure 9. AD7797 Noise Distribution Histogram (VREF = AVDD, Update Rate = 16.7 Hz) (VREF = AVDD, Update Rate = 4.17 Hz) Rev. B | Page 10 of 24 Document Outline FEATURES INTERFACE APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS RMS NOISE AND RESOLUTION SPECIFICATIONS TYPICAL PERFORMANCE CHARACTERISTICS ON-CHIP REGISTERS COMMUNICATION REGISTER RS2, RS1, RS0 = 0, 0, 0 STATUS REGISTER RS2, RS1, RS0 = 0, 0, 0; Power-On/Reset = 0x80 MODE REGISTER RS2, RS1, RS0 = 0, 0, 1; Power-On/Reset = 0x000A CONFIGURATION REGISTER RS2, RS1, RS0 = 0, 1, 0; Power-On/Reset = 0x0710 DATA REGISTER RS2, RS1, RS0 = 0, 1, 1; Power-On/Reset = 0x0000 (AD7796)/0x000000 (AD7797) ID REGISTER RS2, RS1, RS0 = 1, 0, 0; Power-On/Reset = 0x5A (AD7796)/0x5B (AD7797) OFFSET REGISTER RS2, RS1, RS0 = 1, 1, 0; Power-On/Reset = 0x8000 (AD7796)/0x800000 (AD7797) FULL-SCALE REGISTER RS2, RS1, RS0 = 1, 1, 1; Power-On/Reset = 0x5XXX (AD7796)/0x5XXX00 (AD7797) ADC CIRCUIT INFORMATION OVERVIEW DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read Mode CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING REFERENCE RESET BURNOUT CURRENTS AVDD MONITOR TEMPERATURE MONITOR CALIBRATION GROUNDING AND LAYOUT APPLICATIONS INFORMATION WEIGH SCALES OUTLINE DIMENSIONS ORDERING GUIDE