Datasheet AD7691 (Analog Devices) - 4

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Data Sheet AD7691 SPECIFICATIONS
VDD = 2.3 V to 5.25 V, VIO = 2.3 V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted.
Table 2. Parameter Conditions/Comments Min Typ Max Unit
RESOLUTION 18 Bits ANALOG INPUT Voltage Range, VIN IN+ − (IN−) −VREF +VREF V Absolute Input Voltage IN+, IN− −0.1 VREF + 0.1 V Common-Mode Input Range IN+, IN− VREF/2 − 0.1 VREF/2 VREF/2 + 0.1 V Analog Input CMRR fIN = 250 kHz 65 dB Leakage Current at 25°C Acquisition phase 1 nA Input Impedance1 THROUGHPUT Conversion Rate VDD = 4.5 V to 5.25 V 0 250 kSPS VDD = 2.3 V to 4.5 V 0 180 kSPS Transient Response Full-scale step 1.8 μs ACCURACY No Missing Codes 18 Bits Integral Linearity Error −1.5 ±0.75 +1.5 LSB2 Differential Linearity Error −1 ±0.5 +1.25 LSB2 Transition Noise REF = VDD = 5 V 0.75 LSB2 Gain Error3 VDD = 4.5 V to 5.25 V −40 ±2 +40 LSB2 VDD = 2.3 V to 4.5 V −80 ±2 +80 LSB2 Gain Error Temperature Drift ±0.3 ppm/°C Zero Error3 VDD = 4.5 V to 5.25 V −0.8 ±0.1 +0.8 mV VDD = 2.3 V to 4.5 V −3.5 ±0.7 +3.5 mV Zero Temperature Drift ±0.3 ppm/°C Power Supply Sensitivity VDD = 5 V ± 5% ±0.25 LSB2 AC ACCURACY4 Dynamic Range VREF = 5 V 101 102 dB Oversampled Dynamic Range5 fIN = 1 kSPS 125 dB Signal-to-Noise fIN = 1 kHz, VREF = 5 V 100 101.5 dB fIN = 1 kHz, VREF = 2.5 V 95 96.5 dB Spurious-Free Dynamic Range fIN = 1 kHz, VREF = 5 V −125 dB Total Harmonic Distortion fIN = 1 kHz, VREF = 5 V −118 dB Signal-to-(Noise + Distortion) fIN = 1 kHz, VREF = 5 V 100 101.5 dB fIN = 1 kHz, VREF = 2.5 V 95 96.5 dB Intermodulation Distortion6 115 dB 1 See the Analog Inputs section. 2 LSB means least significant bit. With the ±5 V input range, one LSB is 38.15 µV. 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 a full-scale input FSR. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified. 5 Dynamic range obtained by oversampling the ADC running at a throughput fS of 250 kSPS, followed by postdigital filtering with an output word rate fO. 6 fIN1 = 21.4 kHz and fIN2 = 18.9 kHz, with each tone at −7 dB below full scale. Rev. E | Page 3 of 28 Document Outline FEATURES APPLICATIONS APPLICATION DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Thermal Resistance ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE SINGLE-TO-DIFFERENTIAL DRIVER VOLTAGE REFERENCE INPUT POWER SUPPLY SUPPLYING THE ADC FROM THE REFERENCE DIGITAL INTERFACE CS\ MODE, 3-WIRE WITHOUT BUSY INDICATOR CS\ MODE, 3-WIRE WITH BUSY INDICATOR CS\ MODE, 4-WIRE WITHOUT BUSY INDICATOR CS\ MODE, 4-WIRE WITH BUSY INDICATOR CHAIN MODE WITHOUT BUSY INDICATOR CHAIN MODE WITH BUSY INDICATOR APPLICATION HINTS LAYOUT EVALUATING THE AD7691 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE