Datasheet AD7946 (Analog Devices) - 4

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Data Sheet AD7946 SPECIFICATIONS
VDD = 4.5 V to 5.5 V, VIO = 2.3 V to VDD, REF = VDD, TA = −40°C to +85°C, unless otherwise noted.
Table 2. Parameter Test Conditions/Comments Min Typ Max Unit
RESOLUTION 14 Bits ANALOG INPUT Voltage Range IN+ − IN− 0 REF V Absolute Input Voltage IN+ −0.1 VDD + 0.1 V IN− −0.1 0.1 V Analog Input CMRR fIN = 200 kHz 65 dB Leakage Current at 25°C Acquisition phase 1 nA Input Impedance See the Analog Input section ACCURACY No Missing Codes 14 Bits Differential Linearity Error −0.7 ±0.3 +0.7 LSB1 Integral Linearity Error −1 ±0.4 +1 LSB Transition Noise REF = VDD = 5 V 0.33 LSB Gain Error2, TMIN to TMAX ±0.3 ±6 LSB Gain Error Temperature Drift ±1 ppm/°C Offset Error2, TMIN to TMAX ±0.3 ±6 LSB Offset Temperature Drift ±1 ppm/°C Power Supply Sensitivity VDD = 5 V ± 5% ±0.1 LSB THROUGHPUT Conversion Rate 0 500 kSPS Transient Response Full-scale step 400 ns AC ACCURACY Signal-to-Noise fIN = 20 kHz, REF = 5 V 84.5 85 dB3 fIN = 20 kHz, REF = 2.5 V 84 dB Spurious-Free Dynamic Range fIN = 20 kHz −100 dB Total Harmonic Distortion fIN = 20 kHz −100 dB Signal-to-(Noise + Distortion) fIN = 20 kHz, REF = 5 V 84.5 85 dB fIN = 20 kHz, REF = 5 V, −60 dB input 25 dB Intermodulation Distortion4 100 dB 1 LSB means least significant bit. With the 5 V input range, one LSB is 305.2 µV. 2 See the 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. B | Page 3 of 24 Document Outline Features Applications Typical Application Circuit General Description Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configurations 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 Supplying the ADC from the Reference Single-Supply Application 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 Guidelines Layout Evaluating the Performance of the AD7946 Outline Dimensions Ordering Guide