Datasheet AD7791 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | 24-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter |
| Pages / Page | 21 / 10 — Data Sheet. AD7791. TYPICAL PERFORMANCE CHARACTERISTICS. VDD = 3V. –10. … |
| Revision | A |
| File Format / Size | PDF / 532 Kb |
| Document Language | English |
Data Sheet. AD7791. TYPICAL PERFORMANCE CHARACTERISTICS. VDD = 3V. –10. REF = 2.048V. 1.1875Hz UPDATE RATE. –20. TA = 25°C
Model Line for this Datasheet
Text Version of Document
Data Sheet AD7791 TYPICAL PERFORMANCE CHARACTERISTICS 0 9 VDD = 3V –10 V 8 REF = 2.048V 1.1875Hz UPDATE RATE –20 TA = 25°C 7 RMS NOISE = 1.25
µ
F –30 –40 6 –50 5 –60 dB 4 –70 OCCURENCE –80 3 –90 2 –100 1 –110 –120 0 0 20 40 60 80 100 120 140 160 8388592 8388616 FREQUENCY (Hz) CODE
04227-0-012 04227-0-014 Figure 6. Frequency Response with 16.6 Hz Update Rate Figure 9. Noise Histogram for Clock Divide by 8 Mode (CDIV0 = CDIV1 = 1)
V 8388616 DD = 3V 100 VREF = 2.048V 9.5Hz UPDATE RATE TA = 25°C RMS NOISE = 1
µ
V 80 60 CODE OCCURENCE 40 20 VDD = 3V, VREF = 2.048V 1.1875Hz UPDATE RATE TA = 25°C, RMS NOISE = 1.25
µ
F 0 8388592 8388591 8388619 0 20 40 60 80 100 CODE
04227-0-010
READ NO.
04227-0-013 Figure 7. Noise Distribution Histogram Figure 10. Noise Plot in Clock Divide by 8 Mode (CDIV1 = CDIV0 = 0) (CDIV0 = CDIV1 = 1)
8388619 3.0 VDD = 5V UPDATE RATE = 16.6Hz TA = 25°C 2.5 2.0
µ
V) 1.5 CODE RMS NOISE ( 1.0 0.5 VDD = 3V, VREF = 2.048V, 9.5Hz UPDATE RATE TA = 25°C, RMS NOISE = 1
µ
V 8388591 0 0 200 400 600 800 1000 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 READ NO. VREF (V)
04227-0-011 04227-0-015 Figure 8. Typical Noise Plot with 16.6 Hz Update Rate Figure 11. RMS Noise vs. Reference Voltage (CDIV1 = CDIV0 = 0) Rev. A | Page 9 of 20 Document Outline AD7791—Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics On-chip Registers Communications Register (RS1, RS0 = 0, 0) Status Register (RS1, RS0 = 0, 0; Power-on/Reset = 0x8C) Mode Register (RS1, RS0 = 0, 1; Power-on/Reset = 0x02) Filter Register (RS1, RS0 = 1, 0; Power-on/Reset = 0x04) Data Register (RS1, RS0 = 1, 1; Power-on/Reset = 0x000000) ADC Circuit Information Overview Noise Performance Reduced Current Modes Digital Interface Single Conversion Mode Continuous Conversion Mode Continuous Read Mode Circuit Description Analog Input Channel Bipolar/Unipolar Configuration Data Output Coding Reference Input VDD Monitor Grounding and Layout Outline Dimensions Ordering Guide
µ
F –30 –40 6 –50 5 –60 dB 4 –70 OCCURENCE –80 3 –90 2 –100 1 –110 –120 0 0 20 40 60 80 100 120 140 160 8388592 8388616 FREQUENCY (Hz) CODE
04227-0-012 04227-0-014 Figure 6. Frequency Response with 16.6 Hz Update Rate Figure 9. Noise Histogram for Clock Divide by 8 Mode (CDIV0 = CDIV1 = 1)
V 8388616 DD = 3V 100 VREF = 2.048V 9.5Hz UPDATE RATE TA = 25°C RMS NOISE = 1
µ
V 80 60 CODE OCCURENCE 40 20 VDD = 3V, VREF = 2.048V 1.1875Hz UPDATE RATE TA = 25°C, RMS NOISE = 1.25
µ
F 0 8388592 8388591 8388619 0 20 40 60 80 100 CODE
04227-0-010
READ NO.
04227-0-013 Figure 7. Noise Distribution Histogram Figure 10. Noise Plot in Clock Divide by 8 Mode (CDIV1 = CDIV0 = 0) (CDIV0 = CDIV1 = 1)
8388619 3.0 VDD = 5V UPDATE RATE = 16.6Hz TA = 25°C 2.5 2.0
µ
V) 1.5 CODE RMS NOISE ( 1.0 0.5 VDD = 3V, VREF = 2.048V, 9.5Hz UPDATE RATE TA = 25°C, RMS NOISE = 1
µ
V 8388591 0 0 200 400 600 800 1000 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 READ NO. VREF (V)
04227-0-011 04227-0-015 Figure 8. Typical Noise Plot with 16.6 Hz Update Rate Figure 11. RMS Noise vs. Reference Voltage (CDIV1 = CDIV0 = 0) Rev. A | Page 9 of 20 Document Outline AD7791—Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics On-chip Registers Communications Register (RS1, RS0 = 0, 0) Status Register (RS1, RS0 = 0, 0; Power-on/Reset = 0x8C) Mode Register (RS1, RS0 = 0, 1; Power-on/Reset = 0x02) Filter Register (RS1, RS0 = 1, 0; Power-on/Reset = 0x04) Data Register (RS1, RS0 = 1, 1; Power-on/Reset = 0x000000) ADC Circuit Information Overview Noise Performance Reduced Current Modes Digital Interface Single Conversion Mode Continuous Conversion Mode Continuous Read Mode Circuit Description Analog Input Channel Bipolar/Unipolar Configuration Data Output Coding Reference Input VDD Monitor Grounding and Layout Outline Dimensions Ordering Guide
