Datasheet AD7682, AD7689 (Analog Devices) - 6

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AD7682/AD7689 Data Sheet
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 3. Parameter Test Conditions/Comments Min Typ Max Unit
INTERNAL REFERENCE REF Output Voltage 2.5 V at 25°C 2.490 2.500 2.510 V 4.096 V at 25°C 4.086 4.096 4.106 V REFIN Output Voltage1 2.5 V at 25°C 1.2 V 4.096 V at 25°C 2.3 V REF Output Current ±300 µA Temperature Drift ±10 ppm/°C Line Regulation VDD = 5 V ± 5% ±15 ppm/V Long-Term Drift 1000 hours 50 ppm Turn-On Settling Time CREF = 10 µF 5 ms EXTERNAL REFERENCE Voltage Range REF input 0.5 VDD + 0.3 V REFIN input (buffered) 0.5 VDD − 0.5 V Current Drain2 250 kSPS, REF = 5 V 50 µA TEMPERATURE SENSOR Output Voltage3 25°C 283 mV Temperature Sensitivity 1 mV/°C DIGITAL INPUTS Logic Levels VIL −0.3 +0.3 × VIO V VIH 0.7 × VIO VIO + 0.3 V IIL −1 +1 µA IIH −1 +1 µA DIGITAL OUTPUTS Data Format4 Pipeline Delay5 VOL ISINK = +500 µA 0.4 V VOH ISOURCE = −500 µA VIO − 0.3 V POWER SUPPLIES VDD6 Specified performance 2.3 5.5 V VIO Specified performance 1.8 VDD + 0.3 V Standby Current7, 8 VDD and VIO = 5 V at 25°C 50 nA Power Dissipation VDD = 2.5 V, 100 SPS throughput 1.7 µW VDD = 2.5 V, 200 kSPS throughput 3.5 mW VDD = 5 V, 250 kSPS throughput 12.5 18 mW VDD = 5 V, 250 kSPS throughput with internal reference 15.5 21 mW Energy per Conversion VDD = 5 V 60 nJ TEMPERATURE RANGE9 Specified Performance TMIN to TMAX −40 +85 °C 1 This is the output from the internal band gap. 2 This is an average current and scales with throughput. 3 The output voltage is internal and present on a dedicated multiplexer input. 4 Unipolar mode is serial 16-bit straight binary. Bipolar mode is serial 16-bit twos complement. 5 Conversion results available immediately after completed conversion. 6 The minimum VDD supply must be 3 V when the 2.5 V internal reference is enabled, and 4.5 V when the 4.096 V internal reference is enabled. See Figure 23 for more information. 7 With all digital inputs forced to VIO or GND as required. 8 During acquisition phase. 9 Contact an Analog Devices, Inc., sales representative for the extended temperature range. Rev. H | Page 6 of 35 Document Outline Features Applications Functional Block Diagram 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 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 Applications Information Layout Evaluating the AD7682/AD7689 Performance Outline Dimensions Ordering Guide