Datasheet AD7949 (Analog Devices) - 4

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AD7949 Data Sheet SPECIFICATIONS
VDD = 2.3 V to 5.5 V, VIO = 1.8 V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted.
Table 2. Parameter Test Conditions/Comments Min Typ Max Unit
RESOLUTION 14 Bits ANALOG INPUT Voltage Range Unipolar mode 0 +VREF V Bipolar mode −VREF/2 +VREF/2 Absolute Input Voltage Positive input, unipolar and bipolar modes −0.1 VREF + 0.1 V Negative or COM input, unipolar mode −0.1 +0.1 Negative or COM input, bipolar mode VREF/2 − 0.1 VREF/2 VREF/2 + 0.1 Analog Input CMRR fIN = 250 kHz 68 dB Leakage Current at 25°C Acquisition phase 1 nA Input Impedance1 THROUGHPUT Conversion Rate Full Bandwidth2 VDD = 4.5 V to 5.5 V 0 250 kSPS VDD = 2.3 V to 4.5 V 0 200 kSPS ¼ Bandwidth2 VDD = 4.5 V to 5.5 V 0 62.5 kSPS VDD = 2.3 V to 4.5 V 0 50 kSPS Transient Response Full-scale step, full bandwidth 1.8 μs Full-scale step, ¼ bandwidth 14.5 μs ACCURACY No Missing Codes 14 Bits Integral Linearity Error −1 ±0.5 +1 LSB3 Differential Linearity Error −1 ±0.25 +1 LSB Transition Noise REF = VDD = 5 V 0.1 LSB Gain Error4 −5 ±0.5 +5 LSB Gain Error Match −1 ±0.2 +1 LSB Gain Error Temperature Drift ±1 ppm/°C Offset Error4 ±0.5 LSB Offset Error Match −1 ±0.2 +1 LSB Offset Error Temperature Drift ±1 ppm/°C Power Supply Sensitivity VDD = 5 V ± 5% ±0.2 LSB AC ACCURACY5 Dynamic Range 85.6 dB6 Signal-to-Noise fIN = 20 kHz, VREF = 5 V 84.5 85.5 dB fIN = 20 kHz, VREF = 4.096 V internal REF 85 dB fIN = 20 kHz, VREF = 2.5 V internal REF 84 dB SINAD fIN = 20 kHz, VREF = 5 V 84 85 dB fIN = 20 kHz, VREF = 5 V, −60 dB input 33.5 dB fIN = 20 kHz, VREF = 4.096 V internal REF 85 dB fIN = 20 kHz, VREF = 2.5 V internal REF 84 dB Total Harmonic Distortion fIN = 20 kHz −100 dB Spurious-Free Dynamic Range fIN = 20 kHz 108 dB Channel-to-Channel Crosstalk fIN = 100 kHz on adjacent channel(s) −125 dB SAMPLING DYNAMICS −3 dB Input Bandwidth Full bandwidth 1.7 MHz ¼ bandwidth 0.425 MHz Aperture Delay VDD = 5 V 2.5 ns Rev. F | Page 4 of 32 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION OVERVIEW CONVERTER OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAMS Unipolar or Bipolar Bipolar Single Supply ANALOG INPUTS Input Structure Selectable Low-Pass Filter Input Configurations Sequencer Source Resistance DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE OUTPUT/INPUT Internal Reference/Temperature Sensor External Reference and Internal Buffer External Reference Reference Decoupling POWER SUPPLY SUPPLYING THE ADC FROM THE REFERENCE DIGITAL INTERFACE READING/WRITING DURING CONVERSION, FAST HOSTS READING/WRITING AFTER CONVERSION, ANY SPEED HOSTS READING/WRITING SPANNING CONVERSION, ANY SPEED HOST CONFIGURATION REGISTER, CFG GENERAL TIMING WITHOUT A BUSY INDICATOR GENERAL TIMING WITH A BUSY INDICATOR CHANNEL SEQUENCER Examples READ/WRITE SPANNING CONVERSION WITHOUT A BUSY INDICATOR READ/WRITE SPANNING CONVERSION WITH A BUSY INDICATOR APPLICATION HINTS LAYOUT EVALUATING AD7949 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE