Datasheet AD7690 (Analog Devices) - 4

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Data Sheet AD7690 SPECIFICATIONS
VDD = 4.75 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 Min Typ Max Unit
RESOLUTION 18 Bits ANALOG INPUT Voltage Range IN+ to 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 0 400 kSPS Transient Response Full-scale step 400 ns ACCURACY No Missing Codes 18 Bits Integral Linearity Error −1.5 ±0.75 +1.5 LSB2 Differential Linearity Error −1 ±0.5 +1.25 LSB Transition Noise REF = VDD = 5 V 0.75 LSB Gain Error3 −40 ±2 +40 LSB Gain Error Temperature Drift ±0.3 ppm/°C Zero Error3 −0.8 +0.8 mV Zero Temperature Drift ±0.3 ppm/°C Power Supply Sensitivity VDD = 5 V ± 5% ±0.25 LSB AC ACCURACY Dynamic Range VREF = 5 V 101 102 dB4 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 94.5 96 dB Spurious-Free Dynamic Range fIN = 1 kHz, VREF = 5 V −125 dB Total Harmonic Distortion fIN = 1 kHz, VREF = 5 V −125 dB Signal-to-(Noise + Distortion) fIN = 1 kHz, VREF = 5 V 100 101.5 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 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 400 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. C | Page 3 of 24 Document Outline FEATURES APPLICATIONS APPLICATION EXAMPLE GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS 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 AD7690 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE