Datasheet AD7788, AD7789 (Analog Devices) - 10

AD7788/AD7789 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 0 8388625 –10 –20 –30 –40 –50 DE –60 dB CO –70 –80 –90 –100
09 0
–110 VDD = 3V, VREF = 2.048V,
9- 53
TA = 25°C, RMS NOISE = 1.25µV
03539-007
–120
03
8388591 0 20 40 60 80 100 120 140 160 0 200 400 600 800 1000 FREQUENCY (Hz) READ NO.
Figure 6. Frequency Response with 16.6 Hz Update Rate Figure 8. AD7789 Noise Plot
V 3.0 DD = 3V VDD = 5V 70 VREF = 2.048V UPDATE RATE = 16.6Hz TA = 25°C TA = 25°C RMS NOISE = 1.25µV 2.5 60 50 ) 2.0 V CE µ N ( 40 E IS URE 1.5 CC NO O 30 S RM 1.0 20 0.5 10
08 0 3 9- 01 53 9- 03 53
0
03
0 8388591 8388625 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 CODE VREF (V)
Figure 7. AD7789 Noise Histogram Figure 9. AD7788/AD7789 Noise vs. VREF Rev. C | Page 10 of 20 Document Outline FEATURES INTERFACE APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS SPECIFICATIONS AD7789 AD7788 AD7788/AD7789 TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS ON-CHIP REGISTERS COMMUNICATIONS REGISTER (RS1, RS0 = 0, 0) STATUS REGISTER (RS1, RS0 = 0, 0; Power-On/Reset = 0x88 for AD7788 and 0x8C for AD7789) MODE REGISTER (RS1, RS0 = 0, 1; Power-On/Reset = 0x02) DATA REGISTER (RS1, RS0 = 1, 1; Power-On/Reset = 0x0000 for the AD7788 and 0x000000 for the AD7789) ADC CIRCUIT INFORMATION NOISE PERFORMANCE DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read Mode CIRCUIT DESCRIPTION ANALOG INPUT CHANNEL BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING REFERENCE INPUT VDD MONITOR GROUNDING AND LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE NOTES