Datasheet AD7694 (Analog Devices) - 10

Data Sheet AD7694 TYPICAL PERFORMANCE CHARACTERISTICS 4 2.0 POSITIVE INL = +0.68 LSB POSITIVE DNL = +0.59 LSB NEGATIVE INL = –1.14 LSB NEGATIVE DNL = –0.56 LSB 3 1.5 2 1.0 1 0.5 0 0 INL (LSB) DNL (LSB) –1 –0.5 –2 –1.0 –3 –1.5 –4
05003-005
–2.0
05003-008
0 16384 32768 49152 65536 0 16384 32768 49152 65536 CODE CODE
Figure 5. Integral Nonlinearity vs. Code Figure 8. Differential Nonlinearity vs. Code
12000 8000 108568 VDD = REF = 5V VDD = REF = 2.5V 7000 65487 10000 6000 8000 5000 6000 4000 32418 COUNTS COUNTS 3000 28148 4000 2000 2000 12500 10003 1000 2133 2808 0 0 1 0 0 0 0 0 27 50 1 0 0 0
05003-006
0
05003-009
24E0 24E1 24E2 24E3 24E4 24E5 24E6 24E7 24E8 251B 251C 251D 251E 251F 2520 2521 2522 2523 2524 2525 2526 CODE IN HEX CODE IN HEX
Figure 6. Histogram of a DC Input at the Code Center Figure 9. Histogram of a DC Input at the Code Center
0 0 16384 POINT FFT 16384 POINT FFT VDD = REF = 5V VDD = REF = 2.5V –20 –20 fS = 250kSPS fS = 150kSPS fIN = 20.43kHz fIN = 20.43kHz –40 SNR = 92.5dB –40 SNR = 88.5dB THD = –109.9dB THD = –102.7dB –60 SFDR = –111.0dB –60 SFDR = –105.1dB –80 –80 –100 –100 –120 –120 –140 –140 AMPLITUDE (dB OF FULL SCALE) AMPLITUDE (dB OF FULL SCALE) –160 –160 –180
05003-007
–180
05003-010
0 20 40 60 80 100 120 0 10 20 30 40 50 60 70 FREQUENCY (kHz) FREQUENCY (kHz)
Figure 7. FFT Plot Figure 10. FFT Plot Rev. B | Page 9 of 16 Document Outline Features Applications General Description Application Diagram Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Application Information 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 Digital Interface Layout Evaluating the AD7694 Performance Outline Dimensions Ordering Guide