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AD7946:  14-Bit, 500 kSPS PulSAR® ADC in MSOP

Product Details


The AD7946 is a 14-bit, 500 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single 5V power supply, VDD. It contains a very 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, very short aperture delay track/hold circuit. On the CNV rising edge, it 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.

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 or 5 V logic using the separate supply VIO.

The AD7946 is housed in a 10-lead µSOIC or 10-lead QFN (LFCSP) with operation specified from –40°C to +85°C.

Applications

  • Battery-powered equipment
  • Data acquisition
  • Instrumentation
  • Medical instruments
  • Process control

FEATURES and BENEFITS

  • 14-bit resolution with no missing codes
  • Throughput: 500 kSPS
  • INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR)
  • SINAD: 85 dB @ 20 kHz
  • THD: −100 dB @ 20 kHz
  • Pseudo differential analog input range 0 V to REF with REF up to VDD
  • No pipeline delay
  • Single-supply 5 V operation with
    1.8 V/2.5 V/3 V/5 V logic interface
  • 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 3.3 mW @ 5 V/100 kSPS 3.3 μW @ 5 V/100 SPS

Functional Block Diagram for AD7946

Documentation

Title Content Type File Type
AD7946: 14-Bit, 500kSPS PulSAR ADC in MSOP and LFCSP Data Sheet  (Rev B, 07/2014) (pdf, 637 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
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
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 AD7946 with Nios driver FPGA HDL HTML
AD7946 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 AD7946 Recommended External Voltage References for the AD7946
  • For precision, low noise, high accuracy, we recommend the ADR433 or ADR445 reference family.
  • For a reference buffer amplifier, we recommend the AD8031 or the AD8603.

Recommended Digital Isolators for the AD7946

  • For SPI Interface, lowest power, 2.5 kVrms isolation, we recommend the ADuM1401.
  • For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation, we recommend the ADuM3401.
  • For SPI Interface, low power, 5.0 kVrms isolation, we recommend the ADuM4401.
  • For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V), we recommend the ADuM3481.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7946 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7946BCPZRL Status: Last Time Buy LFCSP:LEADFRM CHIP SCALE 10 Ind Reel, 5000 - $7.46 Y  Material Info PDN Purchase
AD7946BCPZRL7 Status: Production LFCSP:LEADFRM CHIP SCALE 10 Ind Reel, 1500 - $7.46 Y  Material Info Notify Me Purchase
AD7946BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $8.25 $7.46 Y  Material Info PCN Purchase Sample
AD7946BRMZRL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $7.46 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.

AD7946 Evaluation kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7946-PMDZ Status: Production Evaluation Board PMOD compatible form factor $27.00 Yes -
EVAL-AD7946SDZ Status: Production Evaluation Board SDP Interface $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Board $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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