Datasheet AD7457 (Analog Devices) - 9

AD7457 TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, fS = 100 kSPS, fSCLK = 10 MHz, VDD = 2.7 V to 5.25 V, VREF = 2.5 V, unless otherwise noted.
75 1.0 0.8 VDD = 5V 0.6 ) 0.4 B 0.2 VDD = 3V 70 0 RROR (LS INAD (dB) S –0.2 DNL E –0.4 –0.6 –0.8 03157-0-014 03157-0-017 65 –1.0 10 20 30 40 50 0 1024 2048 3072 4096 CODE FREQUENCY (kHz)
Figure 5. SINAD vs. Analog Input Frequency for VDD = 3 V and 5 V Figure 8. Typical DNL for the AD7457 for VDD = 5 V
0 1.0 100mV p-p SINE WAVE ON VDD NO DECOUPLING ON V 0.8 –20 DD 0.6 –40 ) 0.4 B 0.2 –60 0 RR (dB) V S DD = 3V –80 RROR (LS P –0.2 VDD = 5V INL E –0.4 –100 –0.6 –120 –0.8 –140 03157-0-015 –1.0 03157-0-018 0 100 200 300 400 500 600 700 800 900 1000 0 1024 2048 3072 4096 CODE SUPPLY RIPPLE FREQUENCY (kHz)
Figure 6. PSRR vs. Supply Ripple Frequency Without Supply Decoupling Figure 9. Typical INL for the AD7457 for VDD = 5 V
0 10,000 9949 8192 POINT FFT CODES f 9,000 SAMPLE = 100kSPS –20 fIN = 30kHz SINAD = 71dB 8,000 THD = –82dB –40 SFDR = –83dB 7,000 6,000 –60 5,000 NR (dB) S –80 COUNTS 4,000 3,000 –100 2,000 –120 1,000 27 CODES 24 CODES –140 03157-0-016 0 03157-0-019 0 30 50 100 2046 2047 2048 2049 2050 2051 FREQUENCY (kHz) CODES
Figure 7. Dynamic Performance for VDD = 5 V Figure 10. Histogram of 10,000 Conversions of a DC Input Rev. A | Page 8 of 20 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM ANALOG INPUT ANALOG INPUT STRUCTURE DIGITAL INPUTS REFERENCE SECTION SERIAL INTERFACE POWER CONSUMPTION MICROPROCESSOR INTERFACING AD7457 to ADSP-218x APPLICATION HINTS GROUNDING AND LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE