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AD7655:  Low Cost, 4-Channel, 1 MSPS 16-Bit PulSAR® A/D Converter

Product Details

The AD7655 is a low cost four channel 16-bit, charge redistribution SAR, Analog-to-Digital Converter which operates from a single 5 Volt power supply. It contains two low noise, wide bandwidth track/hold amplifiers which allow simultaneous sampling, a high-speed 1 MSPS 16-Bit sampling ADC, an internal conversion clock, error correction circuits, and both serial and parallel system interface ports.

Each track/hold has a multiplexer to provide a four-channel ADC.

It features a very high sampling rate mode (Normal) and, for low power applications, a reduced power mode (Impulse) where the power is scaled with the throughput. It is available in a 48-lead LQFP or a 48-lead LFCSP with operation specified from –40°C to +85°C.

The AD7655-EP supports defense and aerospace applications (AQEC standard)


  • AC motor control
  • 3-phase power control
  • 4-channel data acquisition
  • Uninterrupted power supplies
  • Communications


  • 4-channel, 16-Bit Resolution ADC
  • 2 Track-and-Hold Amplifiers
  • Throughput:
    1 MSPS (Normal Mode)
    888 kSPS (Impulse Mode)
  • Analog Input Voltage Range: 0 to 5 V
  • No Pipeline Delay
  • Parallel and serial 5 V/3 V interface
  • Please see data sheet for additional features.

AD7655-EP supports defense and aerospace applications (AQEC standard)

  • Download AD7655-EP Data Sheet (pdf)
  • Military temperature range
    (−55°C to +125°C)
  • Controlled manufacturing baseline
  • Enhanced product change notification
  • Qualification data available on request

Functional Block Diagram for AD7655

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Title Content Type File Type
AD7655: Low Cost, 4-Channel, 16-Bit 1 MSPS PulSAR ADC Data Sheet  (Rev C, 10/2014) (pdf, 535 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
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
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
High Speed, High Accuracy 14-Bit, 16-Bit, and 18-Bit PulSAR ADCs  (pdf, 3826 kB)
A PulSAR Family Brochure (6/2006)
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.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended Driver Amplifiers for the AD7655
  • For low frequency and low bias current, we recommend the ADA4627-1.
  • For ultra low noise, high performance and high voltage supplies, we recommend the ADA4898-1 or the dual ADA4898-2.
  • For low noise and low power applications, we recommend the ADA4841-1.
Recommended External Voltage References - 2.5V for the AD7655
  • 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 ADR421, ADR431 or the ADR4525.

  • For wide supply applications, we recommend the AD780.
  • For cost sensitive applications, we suggest the AD1582 or the ADR391 buffered with the AD8605 amplifier.
Recommended Voltage Regulators for the AD7655
  • For low dropout regulators with inputs up to 5V, we recommend the low noise ADP151 or the low power ADP160.
  • For high current switching regulators with inputs up to 5V, we recommend the low noise ADP2114.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7655 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7655ACPZ Status: Production 48 ld LFCSP 7x7mm (5.1EP) 48 Ind Tray, 260 $10.58 $9.56 Y  Material Info PCN Purchase Sample
AD7655ACPZRL Status: Last Time Buy 48 ld LFCSP 7x7mm (5.1EP) 48 Ind Reel, 2500 - $9.56 Y  Material Info PCN/PDN Purchase
AD7655ASTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $10.58 $9.56 Y  Material Info PCN Purchase Sample
AD7655ASTZRL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $9.56 Y  Material Info PCN Purchase
AD7655SCP-EP-RL Status: Production 48 ld LFCSP 7x7mm (5.1EP) 48 Mil Reel, 2500 - $18.90 N  Material Info PDN 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.

AD7655 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7655EDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-CED1Z Status: Production Evaluation Controller 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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