Datasheet AD7942 (Analog Devices) - 10
| 制造商 | Analog Devices |
| 描述 | 14-Bit, 250 kSPS PulSAR , Pseudo Differential ADC in MSOP/LFCSP |
| 页数 / 页 | 25 / 10 — Data Sheet. AD7942. TYPICAL PERFORMANCE CHARACTERISTICS. 1.00. POSITIVE … |
| 修订版 | C |
| 文件格式/大小 | PDF / 467 Kb |
| 文件语言 | 英语 |
Data Sheet. AD7942. TYPICAL PERFORMANCE CHARACTERISTICS. 1.00. POSITIVE INL = +0.22LSB. POSITIVE DNL = +0.24LSB
该数据表的模型线
文件文字版本
Data Sheet AD7942 TYPICAL PERFORMANCE CHARACTERISTICS 1.00 1.00 POSITIVE INL = +0.22LSB POSITIVE DNL = +0.24LSB NEGATIVE INL = –0.34LSB 0.75 NEGATIVE DNL = –0.12LSB 0.75 0.50 0.50 0.25 0.25 ) ) B B S S L L 0 ( ( 0 L L IN DN –0.25 –0.25 –0.50 –0.50 –0.75
5
–0.75
8 00 00 7- 7- 65 65
–1.00
04
–1.00
04
0 4096 8192 12,288 16,384 0 4096 8192 12,288 16,384 CODE CODE
Figure 5. Integral Nonlinearity vs. Code Figure 8. Differential Nonlinearity vs. Code
150,000 150,000 129,941 VDD = VREF = 2.5V VDD = VREF = 5V 131,072 100,000 100,000 S S T UN UNT CO CO 50,000 50,000
6 9 00 00 7- 7-
0 0 915 216 0 0
65
0 0 0 0 0 0
65
0
04
0
04
1FFD 1FFE 1FFF 2000 2001 2002 2003 1FFD 1FFE 1FFF 2000 2001 2002 2003 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 16,384 POINT FFT 16,384 POINT FFT –20 VDD = V VDD = V REF = 5V –20 REF = 2.5V f f S = 250kSPS S = 250kSPS e) –40 f f IN = 20.43kHz e) –40 IN = 20.43kHz cal SNR = 85.1dB cal SNR = 84.2dB –60 –60 THD = –101.7dB ll S THD = –105dB ll S u SFDR = –105.9dB u SFDR = –104.3dB f F f F –80 –80 B o B o d d ( –100 ( –100 UDE UDE IT –120 IT –120 L L P P AM –140 AM –140 –160
07
–160
10 0 0 7- 7- 65 65
–180
04
–180
04
0 25 50 75 100 125 0 25 50 75 100 125 FREQUENCY (kHz) FREQUENCY (kHz)
Figure 7. FFT Plot Figure 10. FFT Plot Rev. C | Page 9 of 24 Document Outline Features Applications Application Diagram General Description Table of Contents Revision History Specifications Timing Specifications Timing Diagrams 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 Supplying the ADC from the Reference Digital Interface /CS Mode 3-Wire Without Busy Indicator /CS Mode 3-Wire with Busy Indicator /CS Mode 4-Wire Without Busy Indicator /CS Mode 4-Wire with Busy Indicator Chain Mode Without Busy Indicator Chain Mode with Busy Indicator Application Hints Layout Evaluating the Performance of AD7942 Outline Dimensions Ordering Guide
5
–0.75
8 00 00 7- 7- 65 65
–1.00
04
–1.00
04
0 4096 8192 12,288 16,384 0 4096 8192 12,288 16,384 CODE CODE
Figure 5. Integral Nonlinearity vs. Code Figure 8. Differential Nonlinearity vs. Code
150,000 150,000 129,941 VDD = VREF = 2.5V VDD = VREF = 5V 131,072 100,000 100,000 S S T UN UNT CO CO 50,000 50,000
6 9 00 00 7- 7-
0 0 915 216 0 0
65
0 0 0 0 0 0
65
0
04
0
04
1FFD 1FFE 1FFF 2000 2001 2002 2003 1FFD 1FFE 1FFF 2000 2001 2002 2003 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 16,384 POINT FFT 16,384 POINT FFT –20 VDD = V VDD = V REF = 5V –20 REF = 2.5V f f S = 250kSPS S = 250kSPS e) –40 f f IN = 20.43kHz e) –40 IN = 20.43kHz cal SNR = 85.1dB cal SNR = 84.2dB –60 –60 THD = –101.7dB ll S THD = –105dB ll S u SFDR = –105.9dB u SFDR = –104.3dB f F f F –80 –80 B o B o d d ( –100 ( –100 UDE UDE IT –120 IT –120 L L P P AM –140 AM –140 –160
07
–160
10 0 0 7- 7- 65 65
–180
04
–180
04
0 25 50 75 100 125 0 25 50 75 100 125 FREQUENCY (kHz) FREQUENCY (kHz)
Figure 7. FFT Plot Figure 10. FFT Plot Rev. C | Page 9 of 24 Document Outline Features Applications Application Diagram General Description Table of Contents Revision History Specifications Timing Specifications Timing Diagrams 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 Supplying the ADC from the Reference Digital Interface /CS Mode 3-Wire Without Busy Indicator /CS Mode 3-Wire with Busy Indicator /CS Mode 4-Wire Without Busy Indicator /CS Mode 4-Wire with Busy Indicator Chain Mode Without Busy Indicator Chain Mode with Busy Indicator Application Hints Layout Evaluating the Performance of AD7942 Outline Dimensions Ordering Guide