Datasheet AD7678 (Analog Devices) - 4

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AD7678 SPECIFICATIONS Table 2. –40°C to +85°C, VREF = 4.096 V, AVDD = DVDD = 5 V, OVDD = 2.7 V to 5.25 V, unless otherwise noted. Parameter Conditions Min Typ Max Unit
RESOLUTION 18 Bits ANALOG INPUT Voltage Range VIN+ – VIN– –VREF +VREF V Operating Input Voltage VIN+, VIN– to AGND –0.1 AVDD + 0.1 V Analog Input CMRR fIN = 100 kHz 65 dB Input Current 100 kSPS Throughput 4 μA Input Impedance1 THROUGHPUT SPEED Complete Cycle 10 μs Throughput Rate 0 100 kSPS DC ACCURACY Integral Linearity Error –2.5 +2.5 LSB2 Differential Linearity Error –1 +1.75 LSB No Missing Codes 18 Bits Transition Noise VREF = 5 V 0.7 LSB Zero Error, TMIN to TMAX –40 ±40 LSB Zero Error Temperature Drift ±0.5 ppm/°C Gain Error, T 3 MIN to TMAX –0.048 See Note 3 +0.048 % of FSR Gain Error Temperature Drift ±1.6 ppm/°C Power Supply Sensitivity AVDD = 5 V ± 5% ±4 LSB AC ACCURACY Signal-to-Noise fIN = 2 kHz, VREF = 5 V 101 dB4 VREF = 4.096 V 98 100 dB fIN = 10 kHz, VREF = 4.096 V 99.5 dB fIN = 45 kHz, VREF = 4.096 V 98 dB Dynamic Range VIN+ = VIN– = VREF/2 = 2.5 V 103 dB Spurious-Free Dynamic Range fIN = 2 kHz 120 dB fIN = 10 kHz 117 dB fIN = 45 kHz 110 dB Total Harmonic Distortion fIN = 2 kHz –118 dB fIN = 10 kHz –115 dB fIN = 45 kHz –110 dB Signal-to-(Noise + Distortion) fIN = 2 kHz 100 dB fIN = 2 kHz, –60 dB Input 41 dB –3 dB Input Bandwidth 900 kHz SAMPLING DYNAMICS Aperture Delay 2 ns Aperture Jitter 5 ps rms Transient Response Full-Scale Step 8.5 μs Overvoltage Recovery 8.5 μs REFERENCE External Reference Voltage Range REF 3 4.096 AVDD + 0.1 V REF Voltage with Reference Buffer REFBUFIN = 2.5 V 4.05 4.096 4.15 V Reference Buffer Input Voltage Range REFBUFIN 1.8 2.5 2.6 V REFBUFIN Input Current –1 +1 μA REF Current Drain 100 kSPS Throughput 42 μA Rev. A | Page 3 of 28 Document Outline Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Definition of Specifications Integral Nonlinearity Error (INL) Differential Nonlinearity Error (DNL) Gain Error Zero Error Spurious-Free Dynamic Range (SFDR) Effective Number of Bits (ENOB) Total Harmonic Distortion (THD) Dynamic Range Signal-to-Noise Ratio (SNR) Signal-to-(Noise + Distortion) Ratio (S/[N+D]) Aperture Delay Transient Response Typical Performance Characteristics Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Inputs Driver Amplifier Choice Single-to-Differential Driver Voltage Reference Power Supply Power Dissipation versus Throughput Conversion Control Digital Interface Parallel Interface Serial Interface Master Serial Interface Internal Clock Slave Serial Interface External Clock External Discontinuous Clock Data Read after Conversion External Clock Data Read during Conversion Microprocessor Interfacing SPI Interface (ADSP-219x) Application Hints Layout Evaluating the AD7678’s Performance Outline Dimensions Ordering Guide