AD7091R-8:  8-Channel, 1 MSPS, Ultralow Power, 12-Bit ADC in 24-Lead TSSOP and LFCSP

Product Details

Product Status:Recommended for New Designs

The AD7091R-2/AD7091R-4/AD7091R-8 family is a multichannel 12-bit, ultralow power, successive approximation analog-to-converter (ADC) that is available in two, four, or eight analog input channel options. The AD7091R-2/AD7091R-4/AD7091R-8 operate from a single 2.7 V to 5.25 V power supply and is capable of achieving a sampling rate of 1 mega samples per second (MSPS). The AD7091R-2/ AD7091R-4/AD7091R-8 contain a wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 1.5 MHz. The AD7091R-2/AD7091R-4/AD7091R-8 also feature an on-chip conversion clock, an on-chip accurate 2.5 V reference, and a high speed serial interface.

The AD7091R-2/AD7091R-4/AD7091R-8 family offers up to eight single-ended analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially.

The AD7091R-2/AD7091R-4/AD7091R-8 has a serial port interface (SPI) that allows data to be read after the conversion while achieving a 1 MSPS throughput rate. The conversion process and data acquisition is controlled using the CONVST pin.

The AD7091R-2/AD7091R-4/AD7091R-8 family use advanced design techniques to achieve ultralow power dissipation at high throughput rates. They also feature flexible power management options. An on-chip configuration register allows the user to set up different operating conditions. These include power management, alert functionality, busy indication, channel sequencing, and general-purpose output pins. The MUXOUT and ADCIN pins allow for signal conditioning of the multiplexer output prior to acquisition by the ADC.


  • Battery powered systems
  • Personal digital assistants
  • Medical instruments
  • Mobile communications
  • Instrumentation and control systems
  • Data acquisition systems
  • Optical sensors
  • Diagnostic/monitoring functions


  • Fast throughput rate: 1 MSPS
  • Specified for VDD of 2.7 V to
    5.25 V
  • Ultralow power: 467 µA typical at 3 V and 1 MSPS
  • On-chip accurate 2.5 V reference, 5 ppm/°C typical drift
  • 2, 4, and 8 single-ended analog input channels
  • Programmable channel sequencer
  • Alert function available in
    4- and 8-channel versions
  • Busy indication available in
    4- and 8-channel versions
  • GPO pins available in 4- and
    8-channel versions
  • See datasheet for additional features

Functional Block Diagram for AD7091R-8


Title Content Type File Type
AD7091R-2/AD7091R-4/AD7091R-8: 2-/4-/8-Channel, 1 MSPS, Ultralow Power, 12-Bit SAR ADC Data Sheet (Rev A, 07/2014) (pdf, 809 kB) Data Sheets PDF
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-877: Interfacing to High Speed ADCs via SPI  (pdf, 1594 kB) Application Notes PDF
AN-935: Designing an ADC Transformer-Coupled Front End  (pdf, 363 kB) Application Notes PDF
AN-742: Frequency Domain Response of Switched-Capacitor ADCs  (pdf, 401 kB) Application Notes PDF
The Data Conversion Handbook Design Handbooks HTML
MT-031: Grounding Data Converters and Solving the Mystery of  (pdf, 144 kB) Tutorials PDF
MT-002: What the Nyquist Criterion Means to Your Sampled Data System Design  (pdf, 152 kB) Tutorials PDF
MT-001: Taking the Mystery out of the Infamous Formula, "SNR=6.02N + 1.76dB," and Why You Should Care  (pdf, 94 kB) Tutorials PDF
UG-633: Evaluating the AD7091R-2/AD7091R-4/AD7091R-8 12-Bit Monitor and Control System  (pdf, 0) User Guides PDF
UG-409: Evaluation Board for the AD7091R Analog-to-Digital Converter  (pdf, 1662 kB) User Guides 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
Analog Devices’ A/D Converters with Internal Reference Consume Lowest Power with High Accuracy/Small Package Combination (27 Aug 2014) Press Releases HTML
SAR ADC & Driver Quick-Match Guide  (pdf, 251 kB)
Find drivers for ADI's most popular single-ended and differential SAR ADCs based on your specific application conditions.
Product Selection Guide PDF
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7091R-8 IBIS Model  (ibs) IBIS Models IBS

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 AD7091R-8

Recommended External References for the AD7091R-8
  • For a 3V, low power, low noise, we recommend the ADR4530 or the REF193.
  • For a 5V, low power, low noise, we recommend the ADR4550 or the REF195.

Recommended Low Dropout Regulators and Switchers for the AD7091R-8

Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7091R-8 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7091R-8BRUZ Status: Production 24 ld TSSOP 24 Ind Tube, 62 $4.10 $3.36 Y  Material Info PCN Purchase Sample
AD7091R-8BRUZ-RL7 Status: Production 24 ld TSSOP 24 Ind Reel, 1000 $4.10 $3.36 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.

AD7091R-2/AD7091R-4/AD7091R-8 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7091R-2SDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-AD7091R-4SDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-AD7091R-8SDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Board $99.00 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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