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 ...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.

Features

  • 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

Diagrams

AD7705 Diagram
Functional Block Diagram for AD7705

Specifications

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

AD7357 - Differential Input, Dual, Simultaneous Sampling, 4.25 MSPS, 14-Bit, SAR ADC

AD7781 - 20-Bit, Pin-Programmable, Ultralow Power Sigma-Delta ADC

AD7192 - 4.8 kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA

AD7780 - 24-Bit Pin-Programmable Low Power Σ−Δ ADC

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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
AD7147A 16 250KSPS 13 6.5mW
AD9268-80 16 80MSPS 2 425mW
AD9268-125 16 125MSPS 2 788mW
AD9262-10 16 160MSPS 2 -
Pricing, Packaging & Availability

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For detailed drawings and chemical composition please consult our  Package Site

Pin Count
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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.

*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.

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