Datasheet AD7291 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor |
| Pages / Page | 29 / 10 — Data Sheet. AD7291. 3.0. 125. VDD = VDRIVE = 3V. 120. fSCL = 400kHz. 2.5. … |
| Revision | C |
| File Format / Size | PDF / 580 Kb |
| Document Language | English |
Data Sheet. AD7291. 3.0. 125. VDD = VDRIVE = 3V. 120. fSCL = 400kHz. 2.5. d N (. 115. IO AT. 110. 2.0. L O S. 105. I L. (V) F 1.5. 100. REV. -CHANNE. 1.0. O -T
Model Line for this Datasheet
Text Version of Document
Data Sheet AD7291 3.0 125 VDD = VDRIVE = 3V VDD = VDRIVE = 3V 120 B) fSCL = 400kHz 2.5 d N ( 115 IO AT 110 2.0 L O S 105 I L (V) F 1.5 100 REV 95 -CHANNE 1.0 O -T 90 L 85 0.5 CHANNE 80 0 75 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
018 021
1 10 100 1k CURRENT LOAD (mA) fNOISE (kHz)
08711- 08711- Figure 10. VREF vs. Reference Output Drive Figure 13. Channel-to-Channel Isolation, fIN = 10 kHz
55 72 VDRIVE = 3V VDD = 3V 50 °C) ( 45 NG 71 ADI 40 B) d RE URE 35 T INAD ( A S 70 30 EMPER T 25 20 69 0 20 40 60 80 100
014
0 0.5 1.0 1.5 2.0 2.5
036 1- 1
TIME (Seconds) EXTERNAL REFERENCE (V)
087 08711- Figure 11. Response to Thermal Shock from Room Temperature into 50°C Figure 14. SINAD vs. Reference Voltage, fSCL = 400 kHz, fs = 22.22 kSPS Stirred Oil
–90 1.5 VDD = 3V –92 VDRIVE = 3V 1.0 –94 °C) –96 0.5 R ( –98 B) RRO 0 d E –100 RR ( S URE P –0.5 –102 RAT E –104 P M –1.0 E T –106 –1.5 –108 –110 –2.0 1k 10k 100k 1M 10M 100M
061
–40 –25 –10 5 20 35 50 65 80 95 110 125
1- 017
RIPPLE FREQUENCY (Hz)
1 087
TEMPERATURE (°C)
08711- Figure 12. PSRR vs. Supply Ripple Frequency Without Supply Decoupling Figure 15. Temperature Accuracy at 3 V Rev. C | Page 9 of 28 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS REVISION HISTORY SPECIFICATIONS I2C TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT ADC TRANSFER FUNCTION TEMPERATURE SENSOR OPERATION TEMPERATURE SENSOR AVERAGING Temperature Value Format VDRIVE THE INTERNAL OR EXTERNAL REFERENCE RESET INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER COMMAND REGISTER (0x00) Sample Delay and Bit Trial Delay VOLTAGE CONVERSION RESULT REGISTER (0x01) Temperature Value Format TSENSE CONVERSION RESULT REGISTER (0x02) TSENSE AVERAGE RESULT REGISTER (0X03) LIMIT REGISTERS (0X04 TO 0X1E) DATAHIGH Register DATALOW Register HYSTERESIS REGISTER ALERT STATUS REGISTER A AND ALERT STATUS REGISTER B (0x1F AND 0x20) I2C INTERFACE SERIAL BUS ADDRESS BYTE GENERAL I2C TIMING WRITING TO THE AD7291 WRITING TWO BYTES OF DATA TO A 16-BIT REGISTER WRITING TO MULTIPLE REGISTERS READING DATA FROM THE AD7291 READING TWO BYTES OF DATA FROM A 16-BIT REGISTER MODES OF OPERATION COMMAND MODE AUTOCYCLE MODE OUTLINE DIMENSIONS ORDERING GUIDE
018 021
1 10 100 1k CURRENT LOAD (mA) fNOISE (kHz)
08711- 08711- Figure 10. VREF vs. Reference Output Drive Figure 13. Channel-to-Channel Isolation, fIN = 10 kHz
55 72 VDRIVE = 3V VDD = 3V 50 °C) ( 45 NG 71 ADI 40 B) d RE URE 35 T INAD ( A S 70 30 EMPER T 25 20 69 0 20 40 60 80 100
014
0 0.5 1.0 1.5 2.0 2.5
036 1- 1
TIME (Seconds) EXTERNAL REFERENCE (V)
087 08711- Figure 11. Response to Thermal Shock from Room Temperature into 50°C Figure 14. SINAD vs. Reference Voltage, fSCL = 400 kHz, fs = 22.22 kSPS Stirred Oil
–90 1.5 VDD = 3V –92 VDRIVE = 3V 1.0 –94 °C) –96 0.5 R ( –98 B) RRO 0 d E –100 RR ( S URE P –0.5 –102 RAT E –104 P M –1.0 E T –106 –1.5 –108 –110 –2.0 1k 10k 100k 1M 10M 100M
061
–40 –25 –10 5 20 35 50 65 80 95 110 125
1- 017
RIPPLE FREQUENCY (Hz)
1 087
TEMPERATURE (°C)
08711- Figure 12. PSRR vs. Supply Ripple Frequency Without Supply Decoupling Figure 15. Temperature Accuracy at 3 V Rev. C | Page 9 of 28 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS REVISION HISTORY SPECIFICATIONS I2C TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT ADC TRANSFER FUNCTION TEMPERATURE SENSOR OPERATION TEMPERATURE SENSOR AVERAGING Temperature Value Format VDRIVE THE INTERNAL OR EXTERNAL REFERENCE RESET INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER COMMAND REGISTER (0x00) Sample Delay and Bit Trial Delay VOLTAGE CONVERSION RESULT REGISTER (0x01) Temperature Value Format TSENSE CONVERSION RESULT REGISTER (0x02) TSENSE AVERAGE RESULT REGISTER (0X03) LIMIT REGISTERS (0X04 TO 0X1E) DATAHIGH Register DATALOW Register HYSTERESIS REGISTER ALERT STATUS REGISTER A AND ALERT STATUS REGISTER B (0x1F AND 0x20) I2C INTERFACE SERIAL BUS ADDRESS BYTE GENERAL I2C TIMING WRITING TO THE AD7291 WRITING TWO BYTES OF DATA TO A 16-BIT REGISTER WRITING TO MULTIPLE REGISTERS READING DATA FROM THE AD7291 READING TWO BYTES OF DATA FROM A 16-BIT REGISTER MODES OF OPERATION COMMAND MODE AUTOCYCLE MODE OUTLINE DIMENSIONS ORDERING GUIDE
