AD7730L
PRODUCTIONCMOS, 24-Bit Low Power Sigma-Delta ADC for Bridge Transducer Applications
- Part Models
- 4
- 1ku List Price
- Starting From $16.89
Overview
- 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
- Operates with Reference Voltages of 1 V to 5 V
The AD7730L 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 device 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 110,000 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 AD7730L 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 3 ppm/°C. The part is available in a 24-lead SOIC and 24-lead TSSOP package. It is a lower power version of the AD7730 (approximately 1/3 the power).
Documentation
Data Sheet 1
Application Note 8
Technical Articles 4
Device Drivers 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7730LBRUZ | 24-Lead TSSOP | ||
| AD7730LBRUZ-REEL7 | 24-Lead TSSOP | ||
| AD7730LBRZ | 24-Lead SOIC (Wide) | ||
| AD7730LBRZ-REEL | 24-Lead SOIC (Wide) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Mar 9, 2012 - 12_0060 AD7730L Specification change |
||
| AD7730LBRUZ | PRODUCTION | |
| AD7730LBRUZ-REEL7 | PRODUCTION | |
| AD7730LBRZ | PRODUCTION | |
| AD7730LBRZ-REEL | PRODUCTION | |
|
Feb 11, 2011 - 10_0005 Halogen Free Material Change for TSSOP Products Assembled at Amkor |
||
| AD7730LBRUZ | PRODUCTION | |
| AD7730LBRUZ-REEL7 | PRODUCTION | |
|
Aug 4, 2010 - 10_0117 Halogen Free Material Change for SOIC_W Products at Carsem |
||
| AD7730LBRZ | PRODUCTION | |
| AD7730LBRZ-REEL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
AD7730/L Code Examples 2
Evaluation Software 0
Can't find the software or driver you need?
Tools & Simulations
Design Tool 1
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Open ToolEvaluation Kits
AD7730L Evaluation Kit