Datasheet AD7985 (Analog Devices) - 10

Data Sheet AD7985 TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = DVDD = VIO = 2.5 V, BVDD = 5.0 V, VREF = 5.0 V, external reference (PDREF is high, REFIN is low), unless otherwise noted.
1.25 1.00 POSITIVE INL = +0.38LSB POSITIVE DNL = +0.19LSB 1.00 NEGATIVE INL = –0.46LSB NEGATIVE DNL = –0.20LSB 0.75 0.75 0.50 0.50 0.25 ) 0.25 B B) S LS L 0 ( 0 L ( IN –0.25 DNL –0.25 –0.50 –0.50 –0.75 –0.75 –1.00 –1.25 –1.00 0 16,384 32,768 49,152 65,536
105
0 16,384 32,768 49,152 65,536
108
CODE CODE
07947- 07947- Figure 5. Integral Nonlinearity vs. Code Figure 8. Differential Nonlinearity vs. Code
60,000 60,000 57,138 53,522 48,730 50,000 50,000 40,000 38,843 40,000 S S 30,000 UNT 30,000 UNT 26,249 CO CO 20,000 20,000 15,645 11,888 10,000 10,000 6150 2537 0 122 33 0 0 2 479 800 6 0 0 0 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004
106
7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004
109
CODE IN HEX
07947-
CODE IN HEX
07947- Figure 6. Histogram of DC Input at Code Center (External Reference) Figure 9. Histogram of DC Input at Code Transition (External Reference)
60,000 50,000 46,649 43,622 45,000 49,585 50,000 40,000 35,000 40,000 S 33,064 30,000 31,957 S 30,000 UNT 25,000 UNT CO CO 20,474 20,000 20,000 15,598 15,000 10,000 10,000 8455 7024 5000 2947 1662 0 11 565 403 8 0 0 0 90 30 0 0 7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005
107
7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005
110
CODE IN HEX
07947-
CODE IN HEX
07947- Figure 7. Histogram of DC Input at Code Center (Internal Reference) Figure 10. Histogram of DC Input at Code Transition (Internal Reference) Rev. C | Page 9 of 28 Document Outline FEATURES APPLICATIONS APPLICATION DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION CONVERSION MODES OF OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE INPUT Internal Reference, REF = 4.096 V (PDREF Low) External 1.2 V Reference and Internal Buffer (PDREF High) External Reference (PDREF High, REFIN Low) Reference Decoupling POWER SUPPLY DIGITAL INTERFACE DATA READING OPTIONS Reading During Conversion, Fast Host (Turbo or Normal Mode) Split-Reading, Any Speed Host (Turbo or Normal Mode) Reading During Acquisition, Any Speed Host (Turbo or Normal Mode) /CS MODE, 3-WIRE WITHOUT BUSY INDICATOR /CS MODE, 3-WIRE WITH BUSY INDICATOR /CS MODE, 4-WIRE WITHOUT BUSY INDICATOR /CS MODE, 4-WIRE WITH BUSY INDICATOR CHAIN MODE WITHOUT BUSY INDICATOR CHAIN MODE WITH BUSY INDICATOR APPLICATIONS INFORMATION LAYOUT EVALUATING THE AD7985 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE