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AD7730/AD7730L: Bridge Transducer ADC Data Sheet (Rev. B)9/28/2006PDF497 kB
AD7730
CMOS, 24-Bit Sigma-Delta, Bridge Transducer ADC for Load Cell Applications
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Overview
Features and Benefits
- Resolution of 230,000 Counts (Peak-to-Peak)
- Offset Drift: 5 nV/°C
- Gain Drift: 2 ppm/°C
- Line Frequency Rejection: >150 dB
- Buffered Differential Inputs
- Programmable Filter Cutoffs
- Specified for Drift Over Time
- See datasheet for additional features
Product Details
The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts low-level signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary programmable gain front end based around an analog modulator.
The modulator output is processed by a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.
The part features two buffered differential programmable gain analog inputs as well as a differential reference input. The part operates from a single +5 V supply. It accepts four unipolar analog input ranges: 0 mV to ±10 mV, +20 mV, +40 mV and +80 mV and four bipolar ranges: ±10 mV, ±20 mV, ±40 mV and ±80 mV. The peak-to-peak resolution achievable directly from the part is 1 in 230,000 counts. An on-chip 6-bit DAC allows the removal of TARE voltages. Clock signals for synchronizing ac excitation of the bridge are also provided.
The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7730 contains self-calibration and system calibration options, and features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.
The part is available in a 24-pin plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.
APPLICATIONS
- Weigh Scales
- Pressure Measurement
Product Categories
Markets and Technologies
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)
Documentation & Resources
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AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015PDF76 K
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AN-389: Using Sigma-Delta Converters-Part 22/14/2015PDF590 kB
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AN-388: Using Sigma-Delta Converters-Part 12/14/2015PDF590 kB
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AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008PDF217 kB
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AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006PDF222 kB
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AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004PDF70 kB
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AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002PDF149 kB
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AN-283: Sigma-Delta ADCs and DACs9/24/2002PDF1699 kB
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Designing Power Supplies for High Speed ADC2/1/2012
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ADC Input Noise: The Good, The Bad, and The Ugly. Is No Noise Good Noise?2/1/2006 Analog Dialogue
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Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter1/12/2006
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Part 2: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs6/1/2002PDF117K
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Part 1: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs10/1/2001PDF91 K
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Transducer/Sensor Excitation and Measurement Techniques8/1/2000 Analog Dialogue
Software & Systems Requirements
Code Examples
AD7730/L Code Examples
Evaluation Software
Tools & Simulations
Design Tools
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Design Resources
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.
PCN-PDN Information
Support & Discussions
AD7730 Discussions
Sample & Buy
See our Ordering FAQs for answers to questions about online orders, payment options and more.
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.
Sampling:
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Evaluation Boards
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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.