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AD7678:  18-Bit,100 kSPS PulSAR® A/D Converter

Product Details

The AD7678 is an 18-bit, 100 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a single 5 V power supply. The part contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports.

The part is available in 48-lead LQFP or 48-lead LFCSP packages with operation specified from –40°C to +85°C.


  • 18-bit resolution with no missing codes
  • No pipeline delay (SAR architecture)
  • Differential input range: ±VREF (VREF up to 5 V)
  • Throughput: 100 kSPS
  • INL: ±2.5 LSB max (±9.5 ppm of full scale)
  • Dynamic range: 103 dB typ (VREF = 5 V)
  • S/(N+D): 100 dB typ @ 2 kHz (VREF = 5 V)
  • See data sheet for additional features

Functional Block Diagram for AD7678


Title Content Type File Type
AD7678: 18-Bit, 2.5 LSB INL, 100 kSPS SAR ADC Data Sheet (Rev A, 06/2009) (pdf, 1160 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
AN-932: Power Supply Sequencing  (pdf, 95 kB) Application Notes PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Ask the Applications Engineer-27: What problems am I most likely to run into when instrumenting an industrial system?
(Analog Dialogue, Vol. 33, No. 2, February, 1999)
Analog Dialogue HTML
When high performance and low power make the design, ADI converters make the difference. Overview HTML
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.

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Price, packaging, availability

AD7678 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7678ACPZ Status: Production 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Tray, 260 $21.49 $19.43 Y  Material Info PCN Purchase Sample
AD7678ACPZRL Status: Last Time Buy 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Reel, 2500 - $19.43 Y  Material Info PCN/PDN Purchase
AD7678ASTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $21.49 $19.43 Y  Material Info PCN Purchase
AD7678ASTZRL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $19.43 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.

AD7678 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7678EDZ Status: Production Evaluation Board $150.00 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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