Datasheet AD7949 (Analog Devices) - 10

AD7949 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 2.5 V to 5.5 V, VREF = 2.5 V to 5 V, VIO = 2.3 V to VDD, unless otherwise noted.
1.0 1.0 0.5 0.5 ) ) B B S S L L 0 ( 0 L ( L IN DN –0.5 –0.5 –1.0 –1.0 0 4,096 8,192 12,288 16,384
05 08 0
0 4,096 8,192 12,288 16,384
0 1- 1-
CODES
35
CODES
35 07 07 Figure 5. Integral Nonlinearity vs. Code, VREF = VDD = 5 V Figure 8. Differential Nonlinearity vs. Code, VREF = VDD = 5 V
300k 300k VREF = VDD = 5V 261,120 259,473 VREF = VDD = 2.5V 250k 250k 200k 200k S S T T UN 150k UN 150k CO CO 100k 100k 50k 50k 0 0 0 1 0 0 0 0 0 0 0 955 693 0 0 0 0
6
0
9
1FFC 1FFD 1FFE 1FFF 2000 2001 2002 2003
00
1FFC 1FFD 1FFE 1FFF 2000 2001 2002 2003 2004
00 1- 1-
CODE IN HEX
35
CODE IN HEX
35 07 07 Figure 6. Histogram of a DC Input at Code Center Figure 9. Histogram of a DC Input at Code Center
0 0 VREF = VDD = 5V VREF = VDD = 2.5V –20 fS= 250kSPS –20 fs= 200kSPS f f ) IN = 19.9kHz IN = 19.9kHz SNR = 85.3dB ) –40 SNR = 84.2dB –40 cale SINAD = 85.2dB cale SINAD = 82.4dB S THD = –100dB S THD = –84dB ll- ll- –60 u –60 SFDR = 103dB u SFDR = 85dB f F SECOND HARMONIC = –110dB f F SECOND HARMONIC = –100dB o THIRD HARMONIC = –103dB –80 o THIRD HARMONIC = –85dB B –80 B d d ( ( E –100 E D D U –100 U IT IT –120 L L P P M –120 M A A –140 –140 –160 –160 –180 0 25 50 75 100 125
07 10 0
0 25 50 75 100
0 1- 1-
FREQUENCY (kHz)
35
FREQUENCY (kHz)
35 07 07 Figure 7. 20 kHz FFT, VREF = VDD = 5 V Figure 10. 20 kHz FFT, VREF = VDD = 2.5 V Rev. F | Page 10 of 32 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION OVERVIEW CONVERTER OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAMS Unipolar or Bipolar Bipolar Single Supply ANALOG INPUTS Input Structure Selectable Low-Pass Filter Input Configurations Sequencer Source Resistance DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE OUTPUT/INPUT Internal Reference/Temperature Sensor External Reference and Internal Buffer External Reference Reference Decoupling POWER SUPPLY SUPPLYING THE ADC FROM THE REFERENCE DIGITAL INTERFACE READING/WRITING DURING CONVERSION, FAST HOSTS READING/WRITING AFTER CONVERSION, ANY SPEED HOSTS READING/WRITING SPANNING CONVERSION, ANY SPEED HOST CONFIGURATION REGISTER, CFG GENERAL TIMING WITHOUT A BUSY INDICATOR GENERAL TIMING WITH A BUSY INDICATOR CHANNEL SEQUENCER Examples READ/WRITE SPANNING CONVERSION WITHOUT A BUSY INDICATOR READ/WRITE SPANNING CONVERSION WITH A BUSY INDICATOR APPLICATION HINTS LAYOUT EVALUATING AD7949 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE