Datasheet AD7685 (Analog Devices) - 4

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Data Sheet AD7685 SPECIFICATIONS
VDD = 2.3 V to 5.5 V, VIO = 2.3 V to VDD, VREF = VDD, TA = –40°C to +85°C, unless otherwise noted.
Table 2. A Grade B Grade C Grade Parameter Test Conditions Min Typ Max Min Typ Max Min Typ Max Unit
RESOLUTION 16 16 16 Bits ANALOG INPUT Voltage Range IN+ − IN− 0 VREF 0 VREF 0 VREF V Absolute Input Voltage IN+ −0.1 VDD + −0.1 VDD + −0.1 VDD + V 0.1 0.1 0.1 IN− −0.1 +0.1 −0.1 +0.1 −0.1 +0.1 V Analog Input CMRR fIN = 250 kHz 65 65 65 dB Leakage Current at 25°C Acquisition phase 1 1 1 nA Input Impedance See the See the See the Analog Inputs section Analog Inputs section Analog Inputs section ACCURACY No Missing Codes 15 16 16 Bits Differential Linearity Error −1 ±0.7 −1 ±0.5 +1.5 LSB1 Integral Linearity Error −6 +6 −3 ±1 +3 −2 ±0.6 +2 LSB Transition Noise REF = VDD = 5 V 0.5 0.5 0.45 LSB Gain Error2, TMIN to TMAX ±2 ±30 ±2 ±30 ±2 ±15 LSB Gain Error Temperature Drift ±0.3 ±0.3 ±0.3 ppm/°C Offset Error2, TMIN to TMAX VDD = 4.5 V to 5.5 V ±0.1 ±1.6 ±0.1 ±1.6 ±0.1 ±1.6 mV VDD = 2.3 V to 4.5 V ±0.7 ±3.5 ±0.7 ±3.5 ±0.7 ±3.5 mV Offset Temperature Drift ±0.3 ±0.3 ±0.3 ppm/°C Power Supply Sensitivity VDD = 5 V ± 5% ±0.05 ±0.05 ±0.05 LSB THROUGHPUT Conversion Rate VDD = 4.5 V to 5.5 V 0 250 0 250 0 250 kSPS VDD = 2.3 V to 4.5 V 0 200 0 200 0 200 kSPS Transient Response Full-scale step 1.8 1.8 1.8 µs AC ACCURACY Signal-to-Noise Ratio fIN = 20 kHz, 90 90 92 91.5 93.5 dB3 VREF = 5 V fIN = 20 kHz, 86 86 88 87.5 88.5 dB VREF = 2.5 V Spurious-Free Dynamic fIN = 20 kHz −100 −106 −110 dB Range Total Harmonic Distortion fIN = 20 kHz −100 −106 −110 dB Signal-to-(Noise + Distortion) fIN = 20 kHz, 89 90 92 91.5 93.5 dB VREF = 5 V fIN = 20 kHz, 32 33.5 dB VREF = 5 V, −60 dB input fIN = 20 kHz, 86 85.5 87.5 87 88.5 dB VREF = 2.5 V Intermodulation Distortion4 −110 −115 dB 1 LSB means least significant bit. With the 5 V input range, 1 LSB is 76.3 µV. 2 See Terminology section. These specifications do include full temperature range variation but do not include the error contribution from the external reference. 3 All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified. 4 fIN1 = 21.4 kHz, fIN2 = 18.9 kHz, each tone at −7 dB below full scale. Rev. D | Page 3 of 28 Document Outline Features Applications Typical Application Circuit General Description Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Theory of Operation Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Inputs Driver Amplifier Choice Voltage Reference Input Power Supply Supplying the ADC from the Reference Digital Interface CS/ Mode 3-Wire, No BUSY Indicator CS/ Mode 3-Wire with BUSY Indicator CS/ Mode 4-Wire, No BUSY Indicator CS/ Mode 4-Wire with BUSY Indicator Chain Mode, No BUSY Indicator Chain Mode with BUSY Indicator Application Hints Layout Evaluating the Performance of the AD7685 True 16-Bit Isolated Application Example Outline Dimensions Ordering Guide