Datasheet AD7981 (Analog Devices) - 3

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Data Sheet AD7981 SPECIFICATIONS
VDD = 2.5 V, VIO = 2.3 V to 5.5 V, VREF = 5 V, TMIN to TMAX, unless otherwise noted.
Table 1. Parameter Test Conditions/Comments Min Typ Max Unit
RESOLUTION 16 Bits ANALOG INPUT Voltage Range IN+ − IN− 0 VREF V Absolute Input Voltage IN+ −0.1 VREF + 0.1 V IN− −0.1 +0.1 V Analog Input Common-Mode Rejection Ratio (CMRR) fIN = 100 kHz 60 dB Leakage Current at 25°C Acquisition phase 1 nA Input Impedance See the Analog Input section ACCURACY No Missing Codes 16 Bits Differential Nonlinearity (DNL) VREF = 5 V −0.9 ±0.4 +0.9 LSB1 VREF = 2.5 V ±0.5 LSB1 Integral Nonlinearity (INL) 10-Lead MSOP2 VREF = 5 V −2.0 ±0.7 +2.0 LSB1 VREF = 2.5 V ±0.6 LSB1 10-Lead FLATPACK2 VREF = 5 V −2.5 ±0.7 +2.5 LSB1 VREF = 2.5 V ±0.6 LSB1 Transition Noise VREF = 5 V 0.75 LSB1 VREF = 2.5 V 1.2 LSB1 Gain Error3 TMIN to TMAX ±2 LSB1 Gain Error Temperature Drift ±0.35 ppm/°C Zero Error3 TMIN to TMAX −1 ±0.08 +1 mV Zero Temperature Drift 0.45 ppm/°C Power Supply Sensitivity VDD = 2.5 V ± 5% ±0.1 LSB1 THROUGHPUT Conversion Rate 0 600 kSPS Transient Response Full-scale step 290 ns AC ACCURACY4 Dynamic Range VREF = 5 V 92 dB VREF = 2.5 V 87 dB Oversampled Dynamic Range5 OSR = 256 110 dB Signal-to-Noise Ratio (SNR) fIN = 1 kHz, VREF = 5 V 89 91 dB fIN = 1 kHz, VREF = 2.5 V 86 dB Spurious-Free Dynamic Range (SFDR) fIN = 1 kHz 104 dB Total Harmonic Distortion (THD) fIN = 1 kHz −102 dB Signal-to-Noise-and-Distortion (SINAD) Ratio fIN = 1 kHz, VREF = 5 V 90.5 dB fIN = 1 kHz, VREF = 2.5 V 85.5 dB 1 LSB means least significant bit. With the 5 V input range, 1 LSB is 76.3 µV. 2 MSOP operation is specified from −55°C to +175°C and FLATPACK operation specified is specified from −55°C to +210°C. 3 See the Terminology section. These specifications include full temperature range variation, but not the error contribution from the external reference. 4 All ac accuracy specifications (in dB) are referred to an input ful -scale range (FSR). Tested with an input signal at 0.5 dB below ful scale, unless otherwise specified. 5 The oversampled dynamic range is the ratio of the peak signal power to the noise power (for a small input) measured in the ADC output fast Fourier transform (FFT) from dc up to fS/(2 × OSR), where fS is the ADC sample rate and OSR is the oversampling ratio. Rev. B | Page 3 of 26 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUT DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE INPUT POWER SUPPLY DIGITAL INTERFACE \CS MODE, 3-WIRE WITHOUT A BUSY INDICATOR \CS MODE, 3-WIRE WITH A BUSY INDICATOR \CS MODE, 4-WIRE WITHOUT A BUSY INDICATOR \CS MODE, 4-WIRE WITH A BUSY INDICATOR CHAIN MODE WITHOUT A BUSY INDICATOR CHAIN MODE WITH A BUSY INDICATOR APPLICATIONS INFORMATION PRINTED CIRCUIT BOARD (PCB) LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE