Datasheet AD7276, AD7277, AD7278 (Analog Devices) - 13

Data Sheet AD7276/AD7277/AD7278 TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted.
73.0 16,384 POINT FFT –20 FSAMPLE = 3MSPS 72.5 F VDD = 3.6V IN = 1MHz SINAD = 71.2dB THD = –80.9dB 72.0 –40 SFDR = –82.4dB VDD = 3V 71.5 V ) ) DD = 3V B B d –60 d ( ( 71.0 R R VDD = 2.35V SN SN 70.5 –80 70.0 –100
3
69.5
09 0 01 3- 3- 90 90 04
–120
04
69.0 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 100 1000 1500 FREQUENCY (kHz) INPUT FREQUENCY (kHz)
Figure 10. AD7276 Dynamic Performance at 3 MSPS, Input Tone = 1 MHz Figure 13. AD7276 SNR vs. Analog Input Frequency at 3 MSPS for Various Supply Voltages, SCLK Frequency = 48 MHz
–10 30,000 16,384 POINT FFT 30,000 –20 FSAMPLE = 3MSPS CODES FIN = 1MHz 25,000 –30 SINAD = 61.6dB THD = –80.2dB S –40 SFDR = –83.4dB V NCE DD = 3V 20,000 ) –50 B d CURRE ( C R –60 15,000 O SN F –70 R O 10,000 –80 BE –90 NUM 5,000
0
–100
6 01 01 3- 3- 90 90 04
–110
04
0 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 2046 2047 2048 2049 2050 FREQUENCY (kHz) CODE
Figure 11. AD7277 Dynamic Performance at 3 MSPS, Input Tone = 1 MHz Figure 14. Histogram of Codes for 30,000 Samples
72.5 –72 72.0 VDD = 3.6V –74 71.5 –76 V 71.0 DD = 2.35V V –78 DD = 2.35V VDD = 3V B) 70.5 d B) ( VDD = 3V d –80 70.0 INAD HD ( –82 S 69.5 T –84 69.0 VDD = 3.6V 68.5 –86
2
68.0
01
–88
017 3- 90 03- 04
67.5
049
–90 100 1000 1500 100 1000 1500 INPUT FREQUENCY (kHz) INPUT FREQUENCY (kHz)
Figure 12. AD7276 SINAD vs. Analog Input Frequency at 3 MSPS Figure 15. THD vs. Analog Input Frequency at 3 MSPS for Various Supply Voltages, SCLK Frequency = 48 MHz for Various Supply Voltages, SCLK Frequency = 48 MHz Rev. D | Page 13 of 28 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS AD7276 SPECIFICATIONS AD7277 SPECIFICATIONS AD7278 SPECIFICATIONS TIMING SPECIFICATIONS—AD7276/AD7277/AD7278 TIMING EXAMPLES Timing Example 1 Timing Example 2 ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM Analog Input Digital Inputs MODES OF OPERATION Normal Mode Partial Power-Down Mode Full Power-Down Mode Power-Up Times POWER VS. THROUGHPUT RATE SERIAL INTERFACE AD7278 IN A 10 SCLK CYCLE SERIAL INTERFACE MICROPROCESSOR INTERFACING AD7276/AD7277/AD7278 to Blackfin Processor APPLICATION HINTS GROUNDING AND LAYOUT EVALUATING PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE NOTES