The AD7982 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7982 samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.
The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.
The AD7982 is available in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
Data Sheet, Rev. A, 10/07
|Title||Content Type||File Type|
|AD7982: 18-Bit, 1 MSPS PulSAR 7.0 mW ADC in MSOP/QFN Data Sheet (Rev A, 10/2007) (pdf, 665 kB)||Data Sheets|
|AN-1141: Powering a Dual Supply Precision ADC with Switching Regulators (pdf, 640 kB)||Application Notes|
AN-931: Understanding PulSAR ADC Support Circuitry
(pdf, 299 kB)
This application note discusses in general the pitfalls that occur regularly when using SAR ADCs and, more importantly, how to easily prevent them.
|AN-932: Power Supply Sequencing (pdf, 95 kB)||Application Notes|
|AN-877: Interfacing to High Speed ADCs via SPI (pdf, 1594 kB)||Application Notes|
|AN-935: Designing an ADC Transformer-Coupled Front End (pdf, 363 kB)||Application Notes|
|AN-742: Frequency Domain Response of Switched-Capacitor ADCs (pdf, 401 kB)||Application Notes|
|CN-0237: Ultralow Power, 18-Bit, Differential PulSAR ADC Driver (pdf, 463 kB)||Circuit Note|
|CN-0180: Precision Single-Supply Differential ADC Driver for Industrial-Level Signals (pdf, 388 kB)||Circuit Note|
|CN-0032: Converting a Single-Ended Signal with the AD7982 Differential PulSAR ADC (pdf, 99 kB)||Circuit Note|
|The Data Conversion Handbook||Design Handbooks||HTML|
|MT-031: Grounding Data Converters and Solving the Mystery of (pdf, 144 kB)||Tutorials|
|MT-002: What the Nyquist Criterion Means to Your Sampled Data System Design (pdf, 152 kB)||Tutorials|
|MT-001: Taking the Mystery out of the Infamous Formula, "SNR=6.02N + 1.76dB," and Why You Should Care (pdf, 94 kB)||Tutorials|
|MT-074: Differential Drivers for Precision ADCs (pdf, 249 kB)||Tutorials|
|UG-340: Evaluation Board for the 10-Lead Family 14-/16-/18-Bit PulSAR ADCs (pdf, 4636 kB)||User Guides|
|Front-End Amplifier and RC Filter Design for a Precision SAR Analog-to-Digital Converter||Technical Articles||HTML|
|MS-2210: Designing Power Supplies for High Speed ADC (pdf, 327 kB)||Technical Articles|
|MS-2022: Seven Steps to Successful Analog-to-Digital Signal Conversion (Noise Calculation for Proper Signal Conditioning) (pdf, 277 kB)||Technical Articles|
|MS-2124: Understanding AC Behaviors of High Speed ADCs (pdf, 276 kB)||Technical Articles|
Nine Often Overlooked ADC Specifications
(pdf, 445 kB)
Analog-to-digital converters (ADCs) have many specifications; some are more important for a given application than others. Understanding these specifications and controlling external devices affecting the ADC will lead to better performance.
|ECG Detects T-Wave Alternans and Late Potential Waveforms||Technical Articles||HTML|
|Analog Devices Announces Industry’s Fastest, 1nV/√Hz, Low Power, Rail-to-Rail Amplifiers (28 Sep 2011)||Press Releases||HTML|
ADCs Improve Equipment Accuracy While Reducing System Size and Power Consumption
Analog Devices Raises the Standards in Precision Data Conversion to Improve Industrial, Medical and Instrumentation System Performance
Analog Devices Sets New Standard
(EFY Times, 11/14/2006)
|RAQs index||Rarely Asked Questions||HTML|
|Glossary of EE Terms||Glossary||HTML|
|Title||Content Type||File Type|
|AD7982 IBIS Models||IBIS Models||HTML|
|BeMicro FPGA Project for AD7982 with Nios driver||FPGA HDL||HTML|
|AD7982 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design||FPGA HDL||HTML|
Recommended Digital Isolators for the AD7982
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