Datasheet AD7946 (Analog Devices) - 10

Data Sheet AD7946 90.0 15.0 –90 –95 87.5 14.5 B) SNR –100 d ts) Bi THD INAD ( 85.0 14.0 B ( –105 S SINAD NO SFDR NR, E S THD, SFDR (dB) ENOB –110 82.5 13.5 –115
012
80.0 13.0
04656-015
–120 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
04656-
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 REFERENCE VOLTAGE (V) REFERENCE VOLTAGE (V)
Figure 12. SNR, SINAD, and ENOB vs. Reference Voltage Figure 15. THD, SFDR vs. Reference Voltage
90.0 –90 REF = 5V REF = 5V 87.5 –100 B) d B) d 85.0 –110 NR ( S HD ( T 82.5 –120
013 016 04656-
80.0
04656-
–130 –55 –35 –15 5 25 45 65 85 105 125 –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) TEMPERATURE (°C)
Figure 13. SNR vs. Temperature Figure 16. THD vs. Temperature
100 –60 95 –70 90 –80 B) d REF = 5V, –10dB B) d 85 –90 INAD ( HD ( S T REF = 5V, –1dB 80 REF = 5V, –1dB –100 REF = 5V, –10dB 75 –110
014 017 04656-
70
04656-
–120 0 50 100 150 200 0 50 100 150 200 FREQUENCY (kHz) FREQUENCY (kHz)
Figure 14. SINAD vs. Frequency Figure 17. THD vs. Frequency Rev. B | Page 9 of 24 Document Outline Features Applications Typical Application Circuit General Description Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configurations 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 Supplying the ADC from the Reference Single-Supply Application Digital Interface CS/ MODE 3-Wire, No BUSY Indicator CS/ Mode 3-Wire with BUSY Indicator CS/ Mode 4-Wire, No BUSY Indicator CS/ Mode 4-Wire with BUSY Indicator Chain Mode, No BUSY Indicator Chain Mode with BUSY Indicator Application Guidelines Layout Evaluating the Performance of the AD7946 Outline Dimensions Ordering Guide