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AD7686:  500 kSPS 16-BIT PulSAR® A/D Converter in MSOP/QFN

Product Details


The AD7686 is a 16-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. It contains a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, the AD7686 samples an analog input IN+ between 0 V to REF with respect to a ground sense IN−. The reference voltage, REF, is applied externally and can be set up to the supply voltage.

Power dissipation 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 or provides an optional busy indicator. This device is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.

The AD7686 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.

Applications

  • Battery-powered equipment
  • Data acquisitions
  • Instrumentation
  • Medical instruments
  • Process controls

FEATURES and BENEFITS

  • 16-bit resolution with no missing codes
  • Throughput: 500 kSPS
  • INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)
  • SINAD: 92.5 dB @ 20 kHz
  • THD: −110 dB @ 20 kHz
  • Pseudo differential analog input range 0 V to VREF with VREF up to VDD
  • No pipeline delay
  • Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
  • Serial interface SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
  • Daisy-chain multiple ADCs and busy indicator
  • Power dissipation
    3.75 μW @ 5 V/100 SPS
    3.75 mW @ 5 V/100 kSPS
  • Standby current: 1 nA

Functional Block Diagram for AD7686

Similar Products

High Resolution - Single Channel Unipolar/Bipolar 14/16/18-Bit PulSAR ADCs

Documentation

Title Content Type File Type
AD7686: 16-Bit, 500 kSPS PulSAR ADC in MSOP Data Sheet (Rev C, 08/2014) (pdf, 604 kB) Data Sheets PDF
Tested ADC Driver to PulSAR ADC Application Notes HTML
AN-1141: Powering a Dual Supply Precision ADC with Switching Regulators  (pdf, 640 kB) Application Notes PDF
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.
Application Notes PDF
AN-932: Power Supply Sequencing  (pdf, 95 kB) Application Notes PDF
AN-935: Designing an ADC Transformer-Coupled Front End  (pdf, 363 kB) Application Notes PDF
UG-682: 6-Lead SOT-23 ADC Driver for the 8-/10-Lead Family of 14-/16-/18-Bit PulSAR ADC Evaluation Boards  (pdf, 433 kB) User Guides PDF
UG-340: Evaluation Board for the 10-Lead Family 14-/16-/18-Bit PulSAR ADCs  (pdf, 4636 kB) User Guides PDF
Voltage Reference Design for Precision Successive-Approximation ADCs
(Analog Dialogue, Volume 47 – June 2013)
Analog Dialogue HTML
High Speed Op Amp Drives a 16-Bit, 1-MSPS Differential-Input A/D Converter
(Analog Dialogue, Vol. 36, No. 6, November/December 2002)
Analog Dialogue HTML
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 PDF
MS-2022: Seven Steps to Successful Analog-to-Digital Signal Conversion (Noise Calculation for Proper Signal Conditioning)  (pdf, 277 kB) Technical Articles PDF
MS-2124: Understanding AC Behaviors of High Speed ADCs  (pdf, 276 kB) Technical Articles PDF
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.
Technical Articles PDF
Low-Power Data Conversion Technology Enhances Portability
(Electropages, 10/5/2006)
Product Reviews HTML
Lowest-Power 16-Bit ADC Optimizes Portable Designs
(eeProductCenter, 10/4/2006)
Product Reviews HTML
A/D Converter Cranks 550 ksamples/s
(EETimes, 5/29/2003)
Product Reviews HTML
Analog Devices Introduces Fastest, Most Accurate 16-Bit SAR Converter Available in Compact Package
(ChipCenter Product Review. 6/5/2003)
Product Reviews HTML
8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog  (pdf, 1885 kB)
8- to 18-Bit SAR ADCs with Sample Rates up to 3 MSPS -- The latest additions to ADI’s ADC portfolio offer unrivaled functionality in terms of channel count and power supply voltage, optimal power/speed ratios, and the smallest packages to meet the demands of any data acquisition application, including portable, industrial, medical, wireless, and communications.
Overview PDF
High Speed, High Accuracy 14-Bit, 16-Bit, and 18-Bit PulSAR ADCs  (pdf, 3826 kB)
A PulSAR Family Brochure (6/2006)
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7685 IBIS Models IBIS Models HTML
BeMicro FPGA Project for AD7686 with Nios driver FPGA HDL HTML
AD7686 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design FPGA HDL HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Driver Amplifiers for the AD7686
  • For low frequency and low bias current, we recommend the ADA4627-1.
  • For translating +/- 10V signals to 4V, low distortion, fast settling, we recommend the AD8275.
Recommended External Voltage References for the AD7686

  • For best performance, we recommend the ADR435 (5V) reference.
  • For other voltage references, we suggest any of the ADR430 family.
Recommended Digital Isolators for the AD7686
  • For process control applications, we recommend the ADuM1402 family of icouplers.
  • For cost sensitive designs, we recommend the ADuM7442 family.
  • For digital isolators with integrated isolated power, we suggest the ADuM5402 family.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7686 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7686BCPZRL Status: Last Time Buy 10 ld LFCSP (3x3mm) 10 Ind Reel, 5000 - $12.14 Y  Material Info PDN Purchase
AD7686BCPZRL7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $12.14 Y  Material Info Notify Me Purchase Sample
AD7686BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $13.44 $12.14 Y  Material Info PCN Purchase Sample
AD7686BRMZRL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $12.14 Y  Material Info PCN Purchase
AD7686CCPZRL Status: Last Time Buy 10 ld LFCSP (3x3mm) 10 Ind Reel, 5000 - $14.12 Y  Material Info PDN Purchase
AD7686CCPZRL7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $14.12 Y  Material Info Notify Me Purchase Sample
AD7686CRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $15.62 $14.12 Y  Material Info PCN Purchase Sample
AD7686CRMZRL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $14.12 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD7686 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7686-PMDZ Status: Production Evaluation Board PMOD compatible form factor $27.00 Yes -
EVAL-AD7686SDZ Status: Production Evaluation Board SDP Interface $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Board SDP $99.00 Yes -
SDP-PMD-IB1Z Status: Production Evaluation Interposer Board PMOD to SDP w/ Power Supply $55.00 Yes -

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.

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