Datasheet AD7291 (Analog Devices) - 9

AD7291 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 0 1.0 VDD = VDRIVE = 3V f 0.8 S = 22.22ksps –20 fSCL = 400kHz f 0.6 IN = 10kHz SNR = 71.209 0.4 –40 THD = –81.66 B) TA = 25°C d ) 0.2 ( V B DRIVE = 3V V LS DD = 3V UDE –60 0 f IT L ( S = 22.22ksps L IN f P –0.2 SCL = 400kHz AM –80 –0.4 –0.6 –100 INL (POSITIVE) –0.8 INL (NEGATIVE) –120 –1.0 0 2k 4k 6k 8k 10k
009
0 0.5 1.0 1.5 2.0 2.5 3.0
012
FREQUENCY (Hz) V
08711-
REF (V)
08711- Figure 4. Typical FFT Figure 7. INL vs. External VREF
1.0 1.0 TA = 25°C 0.8 VDRIVE = 3V 0.8 VREF = 2.5V 0.6 VDD = 3V 0.6 fS = 22.22ksps 0.4 f 0.4 SCL = 400kHz T ) 0.2 0.2 A = 25°C B B) V S DRIVE = 3V LS 0 L ( 0 VDD = 3V L ( fS = 22.22ksps IN –0.2 DNL –0.2 fSCL = 400kHz –0.4 –0.4 –0.6 –0.6 DNL (POSITIVE) –0.8 –0.8 DNL (NEGATIVE) –1.0 –1.0 0 500 1000 1500 2000 2500 3000 3500 4096
010
0 0.5 1.0 1.5 2.0 2.5 3.0
013
ADC CODE
08711-
VREF (V)
08711- Figure 5. Typical ADC INL Figure 8. DNL vs. External VREF
1.0 11.7 0.8 0.6 11.6 ITS 0.4 OF B 0.2 R 11.5 B) E S B L 0 ( M U N DNL –0.2 E 11.4 TIV –0.4 TA = 25°C C VDRIVE = 3V FFE –0.6 VREF = 2.5V E 11.3 VDD = 3V –0.8 fS = 22.22ksps fSCL = 400kHz –1.0 11.2 0 500 1000 1500 2000 2500 3000 3500 4096
011
0 0.5 1.0 1.5 2.0 2.5
035
ADC CODE
08711-
EXTERNAL REFERENCE (V)
08711- Figure 6. Typical ADC DNL Figure 9. Effective Number of Bits vs. VREF, fSCL = 400 kHz Rev. C | Page 8 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