Features and Benefits
- 16-Bit Σ-Δ ADC
- Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz Update Rate
- VREF Select™ Allows Absolute and Ratiometric Measurement Capability
- Programmable Gain Front End
- ISOURCE Select™
- 16-Bit No Missing Codes
- 13-Bit p-p Resolution @ 20 Hz, 20 mV Range
- 16-Bit p-p Resolution @ 20 Hz, 2.56 V Range
The AD7709 is a complete analog front-end for low frequency measurement applications. The AD7709 contains a 16-bit sigma delta ADC with PGA and can be configured as 2 fully-differential input channels or 4 pseudo-differential input channels. Inputs signal ranges from 20mV to 2.56V can be directly converted using the AD7709. These signals can be converted directly from a transducer without the need for signal conditioning. Other on-chip features include three software configurable current sources, switchable reference inputs, low side power switches and a 4-bit digital I/O port.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Evaluation board for the AD7709, which is a Low Voltage, Low Power, 16-Bit, Sigma Delta ADC. The AD7709 is a complete analog front end for low frequency measurement applications. The device can accept low level input signals directly from a transducer and produce a serial digital output. It employs a sigma-delta 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 device also contains three switchable, ratioed current sources. Full data on the AD7709 is available in the AD7709 datasheet (available on the AD7709 Product Page) and should be consulted in conjunction with this Technical Note when using the evaluation board.
The analog DAC output, and ADC analog input can be accessed through SMA connectors or pin headers on the evaluation board. The jumper programmable interface configurations allow several different circuit options to suit different testing methods. An on-board digital loopback feature allows the ADC and DAC to be tested simultaneously with the use of a signal source and spectrum analyzer.
Documentation & Resources
AN-610: The PGA on Sigma-Delta ADCs (Rev. A)2/14/2015
AN-609: Chopping on Sigma-Delta ADCs (Rev. 0)2/14/2015
AN-608: Input Buffers on Sigma-Delta ADCs (Rev. 0)2/14/2015
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015
AN-389: Using Sigma-Delta Converters-Part 22/14/2015
AN-388: Using Sigma-Delta Converters-Part 12/14/2015
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006
AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004
AN-611: 50 Hz/60Hz Rejection on Sigma-Delta ADCs (Rev. 0)8/15/2003
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002
AN-283: Sigma-Delta ADCs and DACs9/24/2002
Designing Power Supplies for High Speed ADC2/1/2012
Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter1/12/2006
Part 2: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs6/1/2002
Part 1: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs10/1/2001
Tools & Simulations
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|AD7709ARUZ||Material Declaration||Reliability Data||24-Lead TSSOP|
|AD7709ARUZ-REEL7||Material Declaration||Reliability Data||24-Lead TSSOP|
|AD7709BRUZ||Material Declaration||Reliability Data||24-Lead TSSOP|
|AD7709BRUZ-REEL||Material Declaration||Reliability Data||24-Lead TSSOP|
|AD7709BRUZ-REEL7||Material Declaration||Reliability Data||24-Lead TSSOP|
|Wafer Fabrication Data|
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Buy Now Pricing
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