Datasheet AD7484 (Analog Devices) - 10

AD7484 TYPICAL PERFORMANCE CHARACTERISTICS 0 1.0 fIN = 10.7kHz SNR = 78.9dB 0.8 –20 SNR + D = 78.8dB THD = –93.9dB 0.6 –40 0.4 0.2 –60 ) B B) (d LS 0 L ( –80 IN –0.2 –100 –0.4 –0.6 –120 –0.8 –140 –1.0 0 200 400 600 800 1000 1200 1400
003
0 4096 8192 12288 16384
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FREQUENCY (kHz) ADC (Code)
02642- 02642- Figure 3. 64 k FFT Plot with 10 kHz Input Tone Figure 6. Typical INL
0 80 fIN = 1.013MHz SNR = 77.7dB –20 SNR + D = 77.6dB THD = –95.5dB –40 75 –60 B) d B) (d –80 INAD ( S 70 –100 –120 –140 65 0 200 400 600 800 1000 1200 1400
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10 100 1000 10000
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FREQUENCY (kHz) INPUT FREQUENCY (kHz)
02642- 02642- Figure 4. 64 k FFT Plot with 1 MHz Input Tone Figure 7. SINAD vs. Input Tone (AD8021 Input Circuit)
1.0 –40 0.8 200Ω 100Ω 0.6 –50 0.4 –60 0.2 B) B) S d L ( 0 51Ω HD ( –70 T 10Ω DNL –0.2 –80 –0.4 0Ω –0.6 –90 –0.8 –100 –1.0 0 4096 8192 12288 16384
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100 1000 10000
008
ADC (Code) INPUT FREQUENCY (kHz)
02642- 02642- Figure 5. Typical DNL Figure 8. THD vs. Input Tone for Different Input Resistances Rev. C | Page 9 of 20 Document Outline Features Functional Block Diagram General Description Revision History Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Circuit Description Converter Operation Analog Input ADC Transfer Function Power Saving Offset/Overrange Parallel Interface Reading Data from the AD7484 Writing to the AD7484 Driving the CONVST Pin Typical Connection Board Layout and Grounding Outline Dimensions Ordering Guide