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AD7298:  8-Channel, 1MSPS, 12-Bit SAR ADC with Temperature Sensor

Product Details

Product Status:Recommended for New Designs

The AD7298 is a 12-bit, high speed, low power, 8-channel, successive approximation ADC with an internal temperature sensor. The part operates from a single 3.3 V power supply and features throughput rates up to 1 MSPS. The device contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 30 MHz.

The AD7298 offers a programmable sequencer, which enables the selection of a pre-programmable sequence of channels for conversion. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference.

The AD7298 offers a programmable sequencer, which enables the selection of a preprogrammable sequence of channels for conversion. The device has an on-chip, 2.5 V reference that can be disabled to allow the use of an external reference.

The AD7298 includes a high accuracy band gap temperature sensor, which is monitored and digitized by the 12-bit ADC to give a resolution of 0.25°C. The device offers a 4-wire serial interface compatible with SPI and DSP interface standards.

The AD7298 uses advanced design techniques to achieve very low power dissipation at high throughput rates. The part also offers flexible power/throughput rate management options. The part is offered in a 20-lead LFCSP package.

Product Highlights

  1. Ideally suited to monitoring system variables in a variety of systems including telecommunications, process and industrial control.
  2. High Throughput rate of 1Msps per channel with Low Power Consumption.
  3. Eight Single-Ended Inputs with a Channel Sequencer. A consecutive sequence of channels can be selected on which the ADC cycles and converts.
  4. Integrated temperature sensor with 0.25°C resolution.


  • 12 bit SAR ADC
    8 single-ended inputs
    Channel sequencer functionality
    Fast throughput of 1Msps
    Analog Input Range 0 to 2.5V
  • 12-bit temperature-to-digital converter
  • Temperature sensor accuracy of ±1°C
  • Temperature range: −40°C to +125°C
  • Specified for VDD of 2.8 V to 3.6V
  • Logic Voltage VDRIVE = 1.65V to 3.6V
  • Power-down current : <10 μA
  • Internal 2.5V Reference
  • Internal Power on Reset
  • High speed serial interface SPI
  • 20-lead LFCSP

Functional Block Diagram for AD7298

Additional Evaluation Board Information

If you purchase the evaluation board model of this model, you will also need the System Demonstration Platform (SDP).
They are used in conjunction as part of a customer evaluation enviroment. See below for EVAL-SDP-CB1Z ordering information.


Title Content Type File Type
AD7298: 8-Channel, 1MSPS, 12-Bit SAR ADC with Temperature Sensor Data Sheet (Rev B, 06/2011) (pdf, 1382 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
Integrated SAR ADC Family in 4mm x 4mm Package  (pdf, 1670 kB) Tutorials PDF
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-254: Evaluation Board for the AD7298 8-Channel, 1 MSPS, 12-Bit SAR ADC with Temperature Sensor  (pdf, 759 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 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
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
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary 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 AD7298

  • For high speed and low voltage, we recommend the ADA4841-1.
  • For precision, low noise, low cost, single supply, we recommend the ADA4891-4 or the ADA4084-2.
Recommended Precision References - 2.5V for the AD7298
  • For applications requiring the lowest noise performance and output trim adjust, we recommend the ADR441.
  • For high accuracy, low noise, low temperature drift, we recommend the ADR431.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7298 Model Options
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.

AD7298 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7298SDZ Status: Production Evaluation Board $59.00 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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