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AD7982: 18-Bit, 1 MSPS PulSAR ADC in MSOP/LFCSP Data Sheet (Rev. E)11/13/2006PDF482 K
Overview
Features and Benefits
- High performance
- True differential analog input range: ±VREF
- 0 V to VREF with VREF between 2.5 V to 5 V
- Easy to drive with the ADA4941-1 or ADA4940-1
- Throughput: 1 MSPS
- Zero latency architecture
- 18-bit resolution with no missing codes
- INL: ±1 LSB typical, ±2 LSB maximum
- Dynamic range: 99 dB, VREF = 5 V
- SNR: 98 dB at fIN = 1 kHz, VREF = 5 V
- THD: −119 dB at fIN = 1 kHz, VREF = 5 V
- SINAD: 97 dB at fIN = 1 kHz, VREF = 5 V
- True differential analog input range: ±VREF
- Low power dissipation
- Single-supply 2.5 V operation with 1.8 V, 2.5 V, 3 V, and 5 V logic interface
- 4 mW at 1 MSPS (VDD only)
- 7 mW at 1 MSPS (total)
- 70 μW at 10 kSPS
- Proprietary serial interface
- SPI-/QSPI™/ MICROWIRE™-/DSP-compatible1
- Ability to daisy-chain multiple ADCs and busy indicator
- 10-lead MSOP and 3 mm × 3 mm 10-lead LFCSP
- Wide operating temperature range: −40°C to +85°C
Product Details
The AD7982 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. The AD7982 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, VREF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.
The serial peripheral interface (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. The AD7982 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 LFCSP with operation specified from −40°C to +85°C.
Applications
- Automated test equipment
- Data acquisition systems
- Medical instruments
- Machine automation
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
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AN-1494: Converting a Single-Ended Signal with the AD7982 Differential PulSAR ADC (Rev. B)11/17/2017PDF102 K
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AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. C)2/14/2015PDF427 K
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AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)2/14/2015PDF299 kB
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AD7982 Results8/28/2019
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The Data Conversion Handbook, 20051/2/2005
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MT-074: Differential Drivers for Precision ADCs2/14/2015PDF249 kB
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MT-031: Grounding Data Converters and Solving the Mystery of "AGND" and "DGND"3/20/2009PDF144 kB
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MT-001: Taking the Mystery out of the Infamous Formula, "SNR=6.02N + 1.76dB", and Why You Should Care3/4/2009PDF94 kB
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SAR ADC & Driver Quick-Match Guide9/13/2013PDF251 kB
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CN0345: Low Power, Multichannel Data Acquisition System with PGIA for Single-Ended and Differential Industrial-Level Signals (Rev. 0)4/4/2016PDF487 K
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CN-0237: Ultralow Power, 18-Bit, Differential PulSAR ADC Driver6/5/2012PDF463 kB
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CN-0180: Precision Single-Supply Differential ADC Driver for Industrial-Level Signals11/16/2010PDF388 kB
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Protecting ADC Inputs4/1/2017
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Next-Generation SAR ADC Addresses Pain Points of Precision Data Acquisition Signal Chain Design12/1/2016 Analog Dialogue
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Exploring Different SAR ADC Analog Input Architectures1/1/2016
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Low Power Precision Data Acquisition Signal Chain for Space Constrained Applications8/1/2015PDF1 M
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Low Power Precision Data Acquisition Signal Chain For Space Constrained Applications8/1/2015
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Complete Sensor-to-Bits Solution Simplifies Industrial Data-Acquisition System Design4/1/2013 Analog Dialogue
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Designing Power Supplies for High Speed ADC2/1/2012
Software & Systems Requirements
Tools & Simulations
Precision ADC Driver Tool
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
Reference Designs (3)
Product Recommendations
AD7982 Companion Parts
Recommended Digital Isolators
- For SPI Interface, lowest power, 2.5 kVrms isolation: ADUM1401.
- For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation: ADUM3401.
- For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V): ADUM3481.
- For SPI Interface, low power, 5.0 kVrms isolation: ADUM4401.
Recommended External Voltage References
Recommended Driver Amplifiers
- For precision, low power, low distortion applications: ADA4841-1, ADA4940-1, ADA4941-1.
- For low frequency, precision, low bias current applications: ADA4627-1, ADA4610-2, AD8476.
- For high frequency, low noise, low distortion applications: ADA4897-1, AD8021.
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.