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AD7999:  4-Channel, 8-Bit ADC with I2C Compatible Interface in 8-Lead SOT-23

Product Details

The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power, successive approximation ADCs with an I2C compatible interface. Each part operates from a single 2.7 V to 5.5 V power supply and features a 1 μs conversion time.

Each AD7991/AD7995/AD7999 provides a 2-wire serial interface compatible with I2C interfaces. The AD7991 and AD7995 come in two versions and each version has an individual I2C address. This allows two of the same devices to be connected to the same I2C bus. Both versions support standard, fast, and high speed I2C interface modes. The AD7999 comes in one version.

The AD7991/AD7995/AD7999 normally remain in a shutdown state, powering up only for conversions. The conversion process is controlled by a command mode, during which each I2C read operation initiates a conversion and returns the result over the I2C bus.

When four channels are used as analog inputs, the reference for the part is taken from VDD; this allows the widest dynamic input range to the ADC. Therefore, the analog input range to the ADC is 0 V to VDD. An external reference, applied through the VIN3/VREF input, can also be used with this part.

Product Highlights

  1. Four single-ended analog input channels, or three single-ended analog input channels and one reference input channel.
  2. I2C compatible serial Interface. Standard, Fast and Hs-Modes
  3. Automatic shutdown.
  4. Reference derived from the power supply or external reference.
  5. 8-lead SOT-23 Package.


  • System Monitoring
  • Battery Powered Systems
  • Data Acquisition
  • Medical Instruments


  • 12-/10-/8-bit ADC with fast conversion time: 1 μs typical
  • 4 analog input channels/3 analog input channels with reference input
  • Specified for VDD of 2.7 V to 5.5 V
  • Sequencer operation
  • Temperature Range: -40 °C to 125 °C
  • I2C ®-compatible serial interface supports standard, fast, and High-speed modes
  • 2 versions allow 2 I2C addresses
  • Low power consumption
    Shutdown mode: 1 μA max
  • 8-lead SOT-23 package

Functional Block Diagram for AD7999

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Title Content Type File Type
AD7991/AD7995/AD7999: 4-Channel, 12-/10-/8-Bit ADC with I2C Compatible Interface in 8-Lead SOT-23 Data Sheet (Rev B, 10/2010) (pdf, 776 kB) Data Sheets PDF
AN-1233: Using the AD8599 Op Amp as an Ultralow Distortion Driver for the AD7999 4-Channel, 8-Bit ADC  (pdf, 91 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
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD799x - No-OS Driver for Renesas Microcontroller Platforms Device Drivers HTML
AD799x - No-OS Driver for Microchip Microcontroller Platforms Device Drivers HTML
AD7998 IIO ADC Linux Driver (Wiki Site) Device Drivers HTML

Evaluation Kits & Symbols & Footprints

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 Input Buffer Amplifiers for the AD7999

  • For low distortion, low noise, dual supplies, we recommend the AD8599.
  • For precision, low noise, single supply, we recommend the AD8605 family of operational amplifiers.
  • For single supply, high speed, low power, we suggest the AD8031 or the dual AD8032.
  • For precision, high speed, low cost, we recommend the quad AD8604.
Recommended External References - 2.5V for the AD7999
  • For applications requiring best accuracy, low noise, low drift, we recommend the ADR421 or AD780.
  • For low noise, high output current applications, we recommend the ADR431.
  • For wide supply applications, we recommend the ADR03 or AD780.
  • For the reference buffer amplifier, we recommend the AD8605.
  • For applications requiring 2.048V to 4.096V, we recommend the REF191 reference family.
Recommended Digital Isolators for the AD7999

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

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Price, packaging, availability

AD7999 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7999ARJZ-1RL Status: Production 8 ld SOT-23 8 Ind Reel, 10000 - $1.35 Y  Material Info PCN Purchase
AD7999YRJZ-1500RL7 Status: Production 8 ld SOT-23 8 Ind Reel, 500 $1.85 $1.52 Y  Material Info PCN Purchase Sample
AD7999YRJZ-1RL Status: Production 8 ld SOT-23 8 Ind Reel, 10000 - $1.52 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.

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