AD7797
PRODUCTIONLow Power 24-Bit Sigma-Delta A/D Converter for Bridge Sensors
- Part Models
- 2
- 1ku List Price
- Starting From $4.29
Overview
- RMS noise: 65 nV
- Instrumentation amp
- Temperature sensor
- Internal clock oscillator
- Simultaneous 50 Hz/60 Hz rejection
- Update rate range: 4.17 Hz to 123 Hz
- Current: 250 µA typ
- Power-down: 1 µA
- Power supply range: 2.7 V to 5.25 V
- –40°C to +85°C temperature range
- Independent interface power supply
- 16-lead TSSOP
The AD7796/AD7797 are complete, analog front ends for high precision, bridge sensor applications such as weigh scales. The AD7796/AD7797 contain a Σ-∆ ADC capable of 16-/24-bit resolution, respectively. The on-chip instrumentation amplifier has a fixed gain of 128, allowing small amplitude signals such as those from bridge sensors to be directly interfaced to the ADC.
Each device has one differential input and contains a temperature sensor that is internally connected to the ADC. This sensor can be used to perform temperature compensation of the bridge.
The devices can be operated with the internal clock or an external clock. The output data rate from the devices is software-programmable and can be varied from 4.17 Hz to 123 Hz.
The AD7796/AD7797 operate with a power supply from 2.7 V to 5.25 V. Each device consumes a current of 250 µA typical and is housed in a 16-lead TSSOP.
Applications
- Weigh scales
- Strain gages
- Industrial process control
- Instrumentation
- Portable instrumentation
Documentation
Data Sheet 1
Application Note 2
Frequently Asked Question 1
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 |
|---|---|---|---|
| AD7797BRUZ | 16-Lead TSSOP | ||
| AD7797BRUZ-REEL | 16-Lead TSSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 20, 2012 - 11_0218 Halogen Free Material Change for Certain TSSOP Products at Carsem |
||
| AD7797BRUZ | PRODUCTION | |
| AD7797BRUZ-REEL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| AD7124-4 | RECOMMENDED FOR NEW DESIGNS | 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference |
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
AD7797 Evaluation Baord