Datasheet AD7470, AD7472 (Analog Devices) - 3

AD7470/AD7472 AD7472–SPECIFICATIONS1 (VDD = 2.7 V to 5.25 V2, REF IN = 2.5 V, A and B Versions: fCLKIN = 26 MHz @ 5 V and 20 MHz @ 3 V, TA = TMIN to TMAX, unless otherwise noted.) Parameter A Version1 B Version1 Unit Test Conditions/Comments
DYNAMIC PERFORMANCE
5 V 3 V 5 V 3 V
fS = 1.5 MSPS @ 5 V, fS = 1.2 MSPS @ 3 V Signal to Noise + Distortion (SINAD) 69 69 69 69 dB typ fIN = 500 kHz Sine Wave 68 68 68 68 dB min fIN = 100 kHz Sine Wave Signal-to-Noise Ratio (SNR) 70 70 70 70 dB typ fIN = 500 kHz Sine Wave 68 68 68 68 dB min fIN = 100 kHz Sine Wave Total Harmonic Distortion (THD) –83 –78 –83 –78 dB typ fIN = 500 kHz Sine Wave –83 –84 –83 –84 dB typ fIN = 100 kHz Sine Wave –75 –75 –75 –75 dB max fIN = 100 kHz Sine Wave Peak Harmonic or Spurious Noise (SFDR) –86 –81 –86 –81 dB typ fIN = 500 kHz Sine Wave –86 –86 –86 –86 dB typ fIN = 100 kHz Sine Wave –76 –76 –76 –76 dB max fIN = 100 kHz Sine Wave Intermodulation Distortion (IMD) Second-Order Terms –77 –77 –77 –77 dB typ fIN = 500 kHz Sine Wave –86 –86 –86 –86 dB typ fIN = 100 kHz Sine Wave Third-Order Terms –77 –77 –77 –77 dB typ fIN = 500 kHz Sine Wave –86 –86 –86 –86 dB typ fIN = 100 kHz Sine Wave Aperture Delay 5 5 5 5 ns typ Aperture Jitter 15 15 15 15 ps typ Full Power Bandwidth 20 20 20 20 MHz typ @ 3 dB DC ACCURACY fS = 1.5 MSPS @ 5 V, fS = 1.2 MSPS @ 3 V Resolution 12 12 12 12 Bits Integral Nonlinearity ± 2 ± 2 ± 1 ±1 LSB max Guaranteed No Missed Codes to 11 Bits (A Version) Differential Nonlinearity ± 1.8 ± 1.8 ± 0.9 ±0.9 LSB max Guaranteed No Missed Codes to 12 Bits (B Version) Offset Error ± 10 ± 10 ± 10 ±10 LSB max Gain Error ± 2 ± 2 ± 2 ±2 LSB max ANALOG INPUT Input Voltage Ranges 0 to REF IN 0 to REF IN 0 to REF IN 0 to REF IN V DC Leakage Current ± 1 ± 1 ± 1 ±1 µA max Input Capacitance 33 33 33 33 pF typ REFERENCE INPUT REF IN Input Voltage Range 2.5 2.5 2.5 2.5 V ±1% for Specified Performance DC Leakage Current ±1 ±1 ±1 ±1 µA max Input Capacitance 10/20 10/20 10/20 10/20 pF typ Track-and-Hold Mode LOGIC INPUTS Input High Voltage, VINH 2.4 2.4 2.4 2.4 V min Input Low Voltage, VINL 0.4 0.4 0.4 0.4 V max Input Current, I ± IN 1 ±1 ±1 ±1 µA max Typically 10 nA, VIN = 0 V or VDD Input Capacitance, C 3 IN 10 10 10 10 pF max LOGIC OUTPUTS Output High Voltage, VOH VDRIVE – 0.2 VDRIVE – 0.2 VDRIVE – 0.2 VDRIVE – 0.2 V min ISOURCE = 200 µA Output Low Voltage, VOL 0.4 0.4 0.4 0.4 V max ISINK = 200 µA Floating-State Leakage Current ± 10 ± 10 ± 10 ±10 µA max VDD = 2.7 V to 5.25 V Floating-State Output Capacitance 10 10 10 10 pF max Output Coding Straight (Natural) Binary Straight (Natural) Binary CONVERSION RATE Conversion Time 14 14 14 14 CLK IN Cycles (max) Track-and-Hold Acquisition Time 135 135 135 135 ns min Throughput Rate 1.5 1.2 1.5 1.2 MSPS max Conversion Time + Acquisition Time POWER REQUIREMENTS VDD +2.7/+5.25 +2.7/+5.25 V min/max I 4 DD Digital Inputs = 0 V or DVDD Normal Mode 2.4 2.4 mA max VDD = 4.75 V to 5.25 V; Typ 2 mA; fS = 1.5 MSPS Quiescent Current 900 900 µA max VDD = 4.75 V to 5.25 V; fS = 1.5 MSPS Normal Mode 1.5 1.5 mA max VDD = 2.7 V to 3.3 V; Typ 1.3 mA; fS = 1.2 MSPS Quiescent Current 800 800 µA max VDD = 2.7 V to 3.3 V; fS = 1.2 MSPS Sleep Mode 1 1 µA max CLK IN = 0 V or DVDD Power Dissipation4 Digital Inputs = 0 V or DVDD Normal Mode 12 12 mW max VDD = 5 V 4.5 4.5 mW max VDD = 3 V Sleep Mode 5 5 µW max VDD = 5 V; CLK IN = 0 V or DVDD 3 3 µW max VDD = 3 V; CLK IN = 0 V or DVDD NOTES 1Temperature ranges as follows: A and B Versions: –40°C to +85°C. 2The AD7472 functionally works at 2.35 V. Typical specifications @ 25°C for SNR (100 kHz) = 68 dB; THD (100 kHz) = –84 dB; INL ± 0.8 LSB. 3Sample tested @ 25°C to ensure compliance. 4See Power vs. Throughput Rate section. Specifications subject to change without notice. REV. B –3– Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE PIN CONFIGURATIONS PIN FUNCTION DESCRIPTIONS TERMINOLOGY Integral Nonlinearity Differential Nonlinearity Offset Error Gain Error Track-and-Hold Acquisition Time Signal to (Noise + Distortion) Ratio Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise Intermodulation Distortion Aperture Delay Aperture Jitter CIRCUIT DESCRIPTION CONVERTER OPERATION TYPICAL CONNECTION DIAGRAM ADC TRANSFER FUNCTION AC ACQUISITION TIME Reference Input DC ACQUISITION TIME ANALOG INPUT CLOCK SOURCES PARALLEL INTERFACE OPERATING MODES Mode 1 (High Speed Sampling) Mode 2 (Sleep Mode) Burst Mode VDRIVE POWER-UP Power vs. Throughput Mode 1 Mode 2 Typical Performance Characteristics GROUNDING AND LAYOUT POWER SUPPLIES MICROPROCESSOR INTERFACING AD7470/AD7472 to ADSP-2185 Interface AD7470/AD7472 to ADSP-21065 Interface AD7470/AD7472 to TMS320C25 Interface AD7470/AD7472 to PIC17C4x Interface AD7470/AD7472 to 80C186 Interface OUTLINE DIMENSIONS Revision History