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AD7266:  Differential/Single-Ended Input, Dual, Simultaneous Sampling, 2 MSPS, 12-Bit, 3-Channel SAR A/D Converter

Product Details


The AD7266 is a dual, 12-bit, high speed, low power, successive approximation ADC that operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 2 MSPS. The device contains two ADCs, each preceded by a 3-channel multiplexer, and a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 30 MHz.

The conversion process and data acquisition use standard control inputs allowing easy interfacing to microprocessors or DSPs. The input signal is sampled on the falling edge of CS; conversion is also initiated at this point. The conversion time is determined by the SCLK frequency. There are no pipelined delays associated with the part.

The AD7266 uses advanced design techniques to achieve very low power dissipation at high throughput rates. With 5 V supplies and a 2 MSPS throughput rate, the part consumes 6.2 mA maximum. The part also offers flexible power/throughput rate management when operating in normal mode as the quiescent current consumption is so low.

The analog input range for the part can be selected to be a 0 V to VREF (or 2 × VREF) range, with either straight binary or twos complement output coding. The AD7266 has an on-chip 2.5 V reference that can be overdriven when an external reference is preferred. This external reference range is 100 mV to VDD.

Product Highlights

  1. Two Complete ADC Functions Allow Simultaneous Sampling and Conversion of Two Channels. Each ADC has three fully/pseudo differential pairs, or six single-ended channels, as programmed. The conversion result of both channels is simultaneously available on separate data lines, or in succession on one data line if only one serial port is available.
  2. High Throughput with Low Power Consumption. The AD7266 offers a 1.5 MSPS throughput rate with 11.4 mW maximum power dissipation when operating at 3 V.
  3. The AD7266 offers both a standard 0 V to VREF input range and a 2 × V input range.
  4. No Pipeline Delay. The part features two standard successive approximation ADCs with accurate control of the sampling instant via a CS input and once off conversion control.

FEATURES and BENEFITS

  • Chinese data sheet available
  • Dual 12-bit, 3-channel ADC
  • Throughput rate: 2 MSPS
  • Specified for VDD of 2.7 V to 5.25 V
  • Power consumption
    9 mW at 1.5 MSPS with 3 V supplies
    27 mW at 2 MSPS with 5 V supplies
  • Pin-configurable analog inputs
    12-channel single-ended inputs
    6-channel fully differential inputs
    6-channel pseudo differential inputs
  • 70 dB SNR at 50 kHz input frequency
  • Accurate on-chip reference: 2.5 V ±0.2% maximum @ 25°C, 20 ppm/°C maximum
  • Dual conversion with read 437.5 ns, 32 MHz SCLK
  • High speed serial interface SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
  • −40°C to +125°C operation
  • Shutdown mode: 1 μA maximum
  • 32-lead LFCSP and 32-lead TQFP

Functional Block Diagram for AD7266

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Documentation

Title Content Type File Type
AD7266: Differential/Single-Ended Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC Data Sheet  (Rev B, 05/2011) (pdf, 682 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
CN-0187: Crest Factor, Peak, and RMS RF Power Measurement Circuit Optimized for High Speed, Low Power, and Single 3.3 V Supply  (pdf, 163 kB) Circuit Note PDF
CN-0039: AD7266 SAR ADC in DC-Coupled Differential and Single-Ended Applications  (pdf, 109 kB) Circuit Note 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
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
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
Dual-Supply, High-Precision Operational Amplifier Designed for Front-End Amplifier Applications (19 Dec 2012) Press Releases HTML
Medical Applications Overview HTML
Converters for Motor Control  (pdf, 929 kB)
Higher performance, greater accuracy and speed, and ultralow power consumption highlight Analog Devices’ portfolio of data converters for motor control. Each delivers optimum quality signals to/from the real world and processes the data with less development time, fewer parts, and lower costs.
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

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Companion Products

Suggested Companion Products


Recommended Driver Amplifiers for the AD7266 Recommended External Voltage References - 2.5V for the AD7266
  • 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 or the ADR4525.
  • For a reference buffer amplifier, we recommend the OP177 or the ADA4077-2.

Recommended Digital Isolators for the AD7266

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

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Price, packaging, availability

AD7266 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7266BCPZ Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Tray, 490 $5.18 $4.31 Y  Material Info PCN Purchase Sample
AD7266BCPZ-REEL Status: Last Time Buy 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 5000 - $4.31 Y  Material Info PDN Purchase
AD7266BCPZ-REEL7 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 - $4.31 Y  Material Info PCN Purchase
AD7266BSUZ Status: Production 32 ld TQFP (7x7x1.0mm) 32 Ind Tray, 250 $5.30 $4.40 Y  Material Info PCN Purchase Sample
AD7266BSUZ-REEL Status: Production 32 ld TQFP (7x7x1.0mm) 32 Ind Reel, 2000 - $4.40 Y  Material Info PCN Purchase
AD7266BSUZ-REEL7 Status: Production 32 ld TQFP (7x7x1.0mm) 32 Ind Reel, 500 - $4.40 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.

AD7266 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7266EDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-CED1Z Status: Production Evaluation Board $249.00 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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