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AD7485:  14-Bit, 1 MSPS SAR ADC

Product Details

The AD7485 is a 14-bit, high speed, low power, successive-approximation ADC. The part features a serial interface with throughput rates up to 1 MSPS. The part contains a low-noise, wide bandwidth track/hold amplifier, which can handle input frequencies in excess of 10MHz.

The conversion process is a proprietary algorithmic successive-approximation technique. The input signal is sampled and conversion is initiated on the falling edge of a CONVST signal. The conversion process is controlled by an external master clock. Interfacing is via standard serial signal lines making the part directly compatible with microcontrollers and DSPs.

The AD7485 provides excellent ac and dc performance specifications. Factory trimming ensures high dc accuracy resulting in very low INL, offset and gain errors.

The part uses advanced design techniques to achieve very low power dissipation at high throughput rates. Power consumption in normal mode of operation is 70 mW. There are two power-saving modes: a NAP mode, which keeps reference circuitry alive for quick power up, consumes 5 mW while a STANDBY mode reduces power consumption to a mere 5 µW.


  • Fast Throughput Rate: 1 MSPS
  • Wide Input Bandwidth: 40 MHz
  • Excellent DC Accuracy Performance
  • Flexible Serial Interface
  • STANDBY Mode: 2 µA Max
  • Low Power:
    80 mW (Full Power) and
    3 mW (NAP Mode)
  • Single 5 V Supply Operation
  • Internal 2.5 V Reference
  • Full-Scale Overrange Indication

Functional Block Diagram for AD7485


Title Content Type File Type
AD7485: 1MSPS, Serial 14-Bit SAR ADC Data Sheet (Rev A, 04/2010) (pdf, 769 kB) Data Sheets 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

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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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