Datasheet AD7981 (Analog Devices) - 10

AD7981 Data Sheet 0 0 VDD = 2.5V VDD = 2.5V –20 VIO = 3.3V –20 VIO = 3.3V ) fIN = 9972.3Hz ) f E IN = 9972.3Hz f E f –40 SMPLE = 588.51ksps SMPLE = 588.51ksps SNR = 90.05dB –40 CAL CAL SNR = 85.22dB S SINAD = 89.82dB S SINAD = 85.19dB L –60 THD = –102.7dB L –60 THD = –107.6dB UL UL F F F –80 F –80 O O B B d –100 d –100 ( ( UDE –120 UDE –120 IT IT L L P –140 P –140 AM AM –160 –160 –180 –180
8 8
0 50 100 150 200 250 300 0 50 100 150 200 250 300
-03 -05 79 79
FREQUENCY (kHz) FREQUENCY (kHz)
124 124 Figure 18. 10 kHz FFT, VREF = 5.0 V Figure 21. 10 kHz FFT, VREF = 2.5 V
100 16.00 100 16.0 –55°C 15.75 –55°C +25°C 98 15.50 +25°C +175°C 98 15.5 +210°C 15.25 96 15.00 96 15.0 ENOB 14.75 ENOB 94 14.50 94 14.5 14.25 92 14.00 ) ) ) B) 92 14.0 B d B B 13.75 d (d (d 90 13.50 B D ( 90 13.5 B SINAD 13.25 O O INAD ( INA S 88 13.00 EN S 88 13.0 EN 12.75 SINAD 86 12.50 86 12.5 12.25 84 12.00 84 12.0 11.75 82 11.50 82 11.5 11.25 80 11.00 80 11.0 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50
14 1
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
09 2
V
79-
REF (V) V
124
REF (V)
2479- 1 Figure 19. SINAD and ENOB vs. Reference Voltage (VREF), MSOP Figure 22. SINAD and ENOB vs. Reference Voltage (VREF), FLATPACK
–120 110 –120 120 –55°C –55°C –118 +25°C –118 +25°C +175°C 115 SFDR +210°C 105 –116 SFDR –116 110 –114 –114 105 100 –112 –112 ) –110 100 B) B) B) d d ( dB THD d –110 95 ( –108 ( 95 HD ( THD DR D DR T F –106 F –108 S TH 90 S 90 –104 –106 85 –102 –104 –100 80 85 –102 –98 75 –96 –100 80 70 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
7 1 1
2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50
9- -205
VREF (V)
247
V
1
REF (V)
12479 Figure 20. THD and SFDR vs. Reference Voltage (VREF), MSOP Figure 23. THD and SFDR vs. Reference Voltage (VREF), FLATPACK Rev. B | Page 10 of 26 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT 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 Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUT DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE INPUT POWER SUPPLY DIGITAL INTERFACE \CS MODE, 3-WIRE WITHOUT A BUSY INDICATOR \CS MODE, 3-WIRE WITH A BUSY INDICATOR \CS MODE, 4-WIRE WITHOUT A BUSY INDICATOR \CS MODE, 4-WIRE WITH A BUSY INDICATOR CHAIN MODE WITHOUT A BUSY INDICATOR CHAIN MODE WITH A BUSY INDICATOR APPLICATIONS INFORMATION PRINTED CIRCUIT BOARD (PCB) LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE