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AD7705:  3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC

The AD7705 and AD7706 are complete 16-bit, low-cost, Sigma Delta ADCs intended for dc and low-frequency ac measurement applications. Their low power (1 mW max @ 3 V) allows them to be used in loop-powered, battery-powered or locally-powered applications. The on-chip Programmable Gain Amplifier with gain settings from I through 128 can accommodate both low-level and high-level analog inputs with no ...More

AD7705:  3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC

Product Description

The AD7705 and AD7706 are complete 16-bit, low-cost, Sigma Delta ADCs intended for dc and low-frequency ac measurement applications. Their low power (1 mW max @ 3 V) allows them to be used in loop-powered, battery-powered or locally-powered applications. The on-chip Programmable Gain Amplifier with gain settings from I through 128 can accommodate both low-level and high-level analog inputs with no external signal conditioning hardware.

The AD7705 has two differential channels while the AD7706 has one differential and two pseudo-differential channels. Differential reference inputs also allow maximum flexibility in tailoring the device for use in ratiometric applications.

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  • Two Fully Differential Input Channel ADCs
  • Programmable Gain Front End
    Gains from 1 to 128
  • Three-Wire Serial Interface
    SPI®, QSPI™, MICROWIRE™ and DSP Compatible
    Schmitt Trigger Input on SCLK
  • Ability to Buffer the Analog Input
  • 2.7 V to 3.3 V or 4.75 V to 5.25 V Operation
  • Power Dissipation 1 mW max @ 3 V
  • Standby Current 8 µA max
  • 16-Lead DIP, 16-Lead SOIC and TSSOP Packages
  • Resolution (Bits): 16bit
  • T-Put Rate: 500SPS
  • # Chan: 2
  • Supply V: Single(+3),Single(+5)
  • Pwr Diss: 6.5mW
  • Interface: Ser,SPI
  • Ain Range: Bip (Vref)/(PGA Gain),Uni (Vref)/(PGA Gain)
  • SNR (dB): 116dB
  • Pkg Type: DIP,SOIC,SOP

Functional Block Diagram for AD7705

OF NOTE ...

Similar Products

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Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
AD7705 16 500SPS 2 6.5mW
AD7683 16 100KSPS 1 6mW
AD7684 16 100KSPS 1 6mW
AD7694 16 250KSPS 1 6.3mW
AD7706 16 500SPS 3 6.5mW
AD7707 16 500SPS 3 3.75mW
AD7887 12 125KSPS 2 3.5mW
AD9268-80 16 80MSPS 2 425mW
AD9262-10 16 160MSPS 2 675mW
AD9268-125 16 125MSPS 2 788mW
AD7466 12 200KSPS 1 900µW
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Pricing, Packaging & Availability

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For detailed drawings and chemical composition please consult our  Package Site

Pin Count
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Temperature Range
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  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
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Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

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This is the list of Product Change Notifications (PCN) published on the web for this model. Click on the link to access PCN Information.Only select pre-2009 PCN�s are available on-line. To obtain a pre-2009 PCN, contact your ADI Sales Rep. For more information on ADI's PCN process, please visit our PCN Policy Statement page

*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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.