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AD7940:  3 mW, 100 kSPS, 14-Bit ADC in 6-Lead SOT-23

Product Details

The AD79401 is a 14-bit, fast, low power, successive approximation ADC. The part operates from a single 2.50 V to 5.5 V power supply and features throughput rates up to 100 kSPS. The part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 7 MHz.

The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipelined delays associated with the part.

The AD7940 uses advanced design techniques to achieve very low power dissipation at fast throughput rates. The reference for the part is taken internally from VDD, which allows the widest dynamic input range to the ADC. Thus, the analog input range for this part is 0 V to VDD. The conversion rate is determined by the SCLK frequency.

This part features a standard successive approximation ADC with accurate control of the sampling instant via a CS input and once off conversion control.


  • Fast throughput rate: 100 kSPS
  • Specified for VDD of 2.5 V to 5.5 V
  • Low power
    4 mW typ at 100 kSPS with 3 V supplies
    17 mW typ at 100 kSPS with 5 V supplies
  • Wide input bandwidth:
    81 dB SINAD at 10 kHz input frequency
  • Flexible power/serial clock speed management
  • No pipeline delays
  • High speed serial interface
    SPI®/QSPI™/MICROWIRE™/DSP compatible
  • Standby mode: 0.5 μA max
  • 6-Lead SOT-23 and 8-Lead MSOP packages
  • 6-Lead SOT-23 and 8-Lead MSOP packages
  • Standby Mode: 0.5 µA max

Functional Block Diagram for AD7940

AD7940 Diagram
Functional Block Diagram for AD7940


Title Content Type File Type
AD7940: 3 mW, 100 kSPS, 14-Bit A/D Converter in 6-Lead SOT-23 Data Sheet  (Rev A, 08/2011) (pdf, 480 kB) Data Sheets 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
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
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.

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Price, packaging, availability

AD7940 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7940BRJZ-REEL7 Status: Production 6 ld SOT-23 6 Ind Reel, 3000 - $4.15 E  Material Info PCN Purchase
AD7940BRM Status: Production 8 ld MSOP 8 Ind Tube, 50 $4.88 $4.15 N  Material Info PCN Purchase
AD7940BRM-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $4.15 N  Material Info PCN Purchase
AD7940BRMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $4.88 $4.15 Y  Material Info PCN Purchase Sample
AD7940BRMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $4.15 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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