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AD7707:  3 V/5 V, ±10 V Input Range, 1 mW 3-Channel 16-Bit, Sigma-Delta ADC

Product Details


The AD7707 is a complete analog front end for low frequency measurement applications. This 3-channel device can accept either low level input signals directly from a transducer or high level (±10 V) signals and produce a serial digital output. It employs a Σ-Δ conversion technique to realize up to 16 bits of no missing codes performance. The selected input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via an on-chip control register allowing adjustment of the filter cutoff and output update rate.

The AD7707 operates from a single 2.7 V to 3.3 V or 4.75 V to 5.25 V supply. The AD7707 features two low level pseudo differential analog input channels, one high level input channel and a differential reference input. Input signal ranges of 0 mV to 20 mV through 0 V to 2.5 V can be accommodated on both low level input channels when operating with a VDD of 5 V and a reference of 2.5 V. They can also handle bipolar input signal ranges of ±20 mV through ±2.5 V, which are referenced to the LCOM input. The AD7707, with a 3 V supply and a 1.225 V reference, can handle unipolar input signal ranges of 0 mV to 10 mV through 0 V to 1.225 V. Its bipolar input signal ranges are ±10 mV through ±1.225 V. The high level input channel can accept input signal ranges of ±10 V, ±5 V, 0 V to 10 V and 0 V to 5 V. The AD7707 thus performs all signal conditioning and conversion for a 3-channel system.

The AD7707 is ideal for use in smart, microcontroller or DSP- based systems. It features a serial interface that can be configured for 3-wire operation. Gain settings, signal polarity and update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibration options to eliminate gain and offset errors on the part itself or in the system.

CMOS construction ensures very low power dissipation, and the power-down mode reduces the standby power consumption to 20 μW typical. This part is available in a 20-lead wide body (0.3 inch) small outline (SOIC) package and a low profile 20-lead TSSOP.


Product Highlights
  • The AD7707 consumes less than 1 mW at 3 V supplies and 1 MHz master clock, making it ideal for use in low power systems. Standby current is less than 8 μA.
  • On-chip thin-film resistors allow ±10 V, ±5 V, 0 V to 10 V, and 0 V to 5 V high level input signals to be directly accom- modated on the analog inputs without requiring split supplies or charge-pumps.
  • The low level input channels allow the AD7707 to accept input signals directly from a strain gage or transducer removing a considerable amount of signal conditioning.
  • The part features excellent static performance specifications with 16 bits, no missing codes, ±0.003% accuracy, and low rms noise. Endpoint errors and the effects of temperature drift are eliminated by on-chip calibration options, which remove zero-scale and full-scale errors.

FEATURES and BENEFITS

  • Charge balancing ADC
    - 16 bits no missing codes
    - 0.003% nonlinearity
  • High level (±10 V) and low level (±10 mV) input channels
  • True bipolar ±100 mV capability on low level input
    Channels without requiring charge pumps
  • Programmable gain front end
    Gains from 1 to 128
  • 3-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 @ 3 V
  • Standby current 8 µA max
  • 20-Lead SOIC and TSSOP Packages

Functional Block Diagram for AD7707

Documentation

Title Content Type File Type
AD7707: 3 V/5 V, ±10 V Input Range, 1 mW 3-Channel 16-Bit, Sigma-Delta ADC Data Sheet  (Rev B, 01/2010) (pdf, 316 kB) Data Sheets PDF
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging  (pdf, 217 kB) Application Notes PDF
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC  (pdf, 222 kB) Application Notes PDF
AN-615: Peak-to-Peak Resolution Versus Effective Resolution  (pdf, 70 kB)
This application note describes effective resolution and peak-to-peak resolution and highlights the difference between these two specifications.
Application Notes PDF
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:  (pdf, 149 kB)
The Most Common Causes and the Associated Fixes to Prevent Reoccurrence
Application Notes PDF
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change  (pdf, 76 kB) Application Notes PDF
AN-389: Using Sigma-Delta Converters-Part 2  (pdf, 590 kB)
When to Use/How to Use Sigma-Delta ADCs; Continuation of Part 1 Discussion.
Application Notes PDF
AN-388: Using Sigma-Delta Converters-Part 1  (pdf, 590 kB)
When to Use/How to Use Sigma-Delta ADCs
Application Notes PDF
AN-283: Sigma-Delta ADCs and DACs  (pdf, 1699 kB)
Overview of Sigma-Delta Concepts: Oversampling, Noise Shaping Using the Sigma-Delta Modulator, Digital Filtering and Decimation.
Application Notes PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter
(Electronic Design, 1/12/06)
Technical Articles HTML
Designing and Applying Remote Field Instruments
by Albert O' Grady and Jim Ryan, Analog Devices B.V.
...Good things can come in small packages because of on-chip capabilities
(Control Engineering, September 1998)
Technical Articles HTML
Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs Technical Articles HTML
Process Signals from Millivolts to ±10 V Directly with a Versatile Single-Supply 3/5-V Charge-Balancing A/D Converter
(Analog Dialogue, Vol. 33, No. 6, June, 1999)
Analog Dialogue HTML
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
RAQs index Rarely Asked Questions HTML
How do I use the serial interface on the AD7705/06/07 ADC? FAQs/RAQs HTML
What are the general design considerations when using the AD7705/06/07 ADC? FAQs/RAQs HTML
What are the calibration options on the AD7705/06/07 ADC? FAQs/RAQs HTML
What Architecture is used in the AD7705/06/07 ADC? FAQs/RAQs HTML
How do I get the best performance from the AD7705/06/07 ADC? FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Utilities and Conversions HTML

Evaluation Kits & Symbols & Footprints

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.

SampleSample & Buy

Price, packaging, availability

AD7707 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7707BR Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $6.45 $5.48 N  Material Info PCN Purchase
AD7707BR-REEL Status: Contact ADI 20 ld SOIC - Wide 20 Ind Reel, 1000 - - N  Material Info PCN/PDN Contact ADI
AD7707BRU Status: Production 20 ld TSSOP 20 Ind Tube, 75 $6.45 $5.48 N  Material Info PCN Purchase
AD7707BRU-REEL7 Status: Last Time Buy 20 ld TSSOP 20 Ind Reel, 1000 - $5.48 N  Material Info PCN/PDN Purchase
AD7707BRUZ Status: Production 20 ld TSSOP 20 Ind Tube, 75 $5.74 $4.88 Y  Material Info PCN Purchase Sample
AD7707BRUZ-REEL Status: Last Time Buy 20 ld TSSOP 20 Ind Reel, 2500 - $4.88 Y  Material Info PCN/PDN Purchase
AD7707BRUZ-REEL7 Status: Production 20 ld TSSOP 20 Ind Reel, 1000 - $4.88 Y  Material Info PCN Purchase
AD7707BRZ Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $5.74 $4.88 Y  Material Info PCN Purchase Sample
AD7707BRZ-REEL Status: Last Time Buy 20 ld SOIC - Wide 20 Ind Reel, 1000 - $4.88 Y  Material Info PCN/PDN Purchase
AD7707BRZ-REEL7 Status: Production 20 ld SOIC - Wide 20 Ind Reel, 400 - $4.88 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.


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