Datasheet AD7298 (Analog Devices) - 10

AD7298 TYPICAL PERFORMANCE CHARACTERISTICS 0 0.6 VDD = VDRIVE = 3V fSAMPLE = 1.17647MHz f INL MAX –20 IN = 50kHz f 0.4 SCLK = 20MHz SNR = 72.621 THD = –82.562 ) –40 0.2 B d ( ) T B A = 25°C S VDRIVE = 3V UDE –60 L 0 VDD = 3V IT ( L L P IN AM –80 0.2 INL MIN –100 0.4 –120 0.6 0 50 100 150 200 250 300 350 400 450 500
5 3 8 0
1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75
01 4- 4-
FREQUENCY (kHz)
75
REFERENCE VOLTAGE (V)
75 08 08 Figure 3.Typical FFT Figure 6. INL vs. VREF
1.0 0.6 TA = 25°C 0.8 VDRIVE = 3V VREF = 2.5V DNL MAX V 0.4 0.6 DD = 3 V 0.4 0.2 ) 0.2 ) B B T S A = 25°C L S V 0 DRIVE = 3V ( L 0 V L ( L DD = 3V IN –0.2 IN –0.2 –0.4 DNL MIN –0.6 –0.4 –0.8 –1.0 –0.6 0 512 1024 1536 2048 2560 3072 3584 4096
7 1 0
1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 256 768 1280 1792 2304 2816 3328 3840
4-
CODE
75
REFERENCE VOLTAGE (V)
08 Figure 4.Typical ADC INL Figure 7. DNL vs. VREF
1.0 12 TA = 25°C 0.8 VDRIVE = 3V 11 VREF = 2.5V VDD = 3 V 0.6 S 10 IT 0.4 B 9 F ) 0.2 R O 8 B S BE L ( 0 7 L NUM DN –0.2 E 6 IV CT –0.4 E 5 F F –0.6 E 4 –0.8 3 VDD = 3V VDRIVE = 3V –1.0 2
6
0 512 1024 1536 2048 2560 3072 3584 4096
0 01
0 0.5 1.0 1.5 2.0 2.5
02
256 768 1280 1792 2304 2816 3328 3840
4- 4-
CODE
75
V
75 08
REF (V)
08 Figure 5. Typical ADC DNL Figure 8. Effective Number of Bits vs. VREF Rev. B | Page 9 of 24 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION THERMAL RESISTANCE PIN CONFIGURATION AND FUNCTION DESCRIPTION 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 CONTROL REGISTER MODES OF OPERATION TRADITIONAL MULTICHANNEL MODE OF OPERATION REPEAT OPERATION POWER-DOWN MODES Normal Mode Partial Power-Down Mode Full Power-Down Mode POWERING UP THE AD7298 RESET SERIAL INTERFACE TEMPERATURE SENSOR READ LAYOUT AND CONFIGURATION POWER SUPPLY BYPASSING AND GROUNDING TEMPERATURE MONITORING OUTLINE DIMENSIONS ORDERING GUIDE