AD7794
PRODUCTION6-Channel, Low Noise, Low Power, 24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
- Part Models
- 4
- 1ku List Price
- Starting From $8.20
Part Details
- Up to 23 effective bits
- RMS noise: 40 nV @ 4.17 Hz, 85 nV @ 16.7 Hz
- Current: 400 μA typical
- Power-down: 1 μA maximum
- Low noise, programmable gain, instrumentation amp
- Band gap reference with 4 ppm/°C drift typical
- Update rate: 4.17 Hz to 470 Hz
- Six differential analog inputs
- Internal clock oscillator
- Simultaneous 50 Hz/60 Hz rejection
- Reference detect
- Programmable current sources
The AD7794/AD7795 are low power, low noise, complete analog front ends for high precision measurement applications. They contain a low noise, 24-/16-bit Σ-Δ ADC with six differential inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC.
Each device contains a precision, low noise, low drift internal band gap reference, and can also accept up to two external differential references. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator that is used to set the common-mode voltage of a channel to AVDD/2. The low-side power switch can be used to power down bridge sensors between conversions, minimizing the system’s power consumption. The AD7794/AD7795 can operate with either an internal clock or an external clock. The output data rate from each part can vary from 4.17 Hz to 470 Hz.
Both parts operate with a power supply from 2.7 V to 5.25 V. The B-grade parts (AD7794 and AD7795) are specified for a temperature range of −40°C to +105°C while the C-grade part (AD7794) is specified for a temperature range of −40°C to +125°C. They consume a current of 400 μA typical and are housed in a 24-lead TSSOP.
Applications
- Temperature measurement
- Pressure measurement
- Weigh scales
- Strain gage transducers
- Gas analysis
Documentation
Data Sheet 1
Application Note 14
Product Highlight 1
Frequently Asked Question 1
Product Highlight 1
Analog Dialogue 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 |
|---|---|---|---|
| AD7794BRUZ | 24-Lead TSSOP | ||
| AD7794BRUZ-REEL | 24-Lead TSSOP | ||
| AD7794CRUZ | 24-Lead TSSOP | ||
| AD7794CRUZ-REEL | 24-Lead TSSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 20, 2024 - 23_0143 Qualification of an Alternate Wafer Fab Site for 0.5um TSMC CMOS Process |
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| AD7794BRUZ | PRODUCTION | |
| AD7794BRUZ-REEL | PRODUCTION | |
| AD7794CRUZ | PRODUCTION | |
| AD7794CRUZ-REEL | PRODUCTION | |
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Aug 10, 2021 - 21_0035 Amkor Philippines as an Alternate Site for TSSOP_4.4 |
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| AD7794BRUZ | PRODUCTION | |
| AD7794BRUZ-REEL | PRODUCTION | |
| AD7794CRUZ | PRODUCTION | |
| AD7794CRUZ-REEL | PRODUCTION | |
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Jul 23, 2014 - 13_0241 Qualification of ASE Chungli as an Alternate Assembly Site for Select 16L, 20L and 24L TSSOP Packages |
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| AD7794BRUZ | PRODUCTION | |
| AD7794BRUZ-REEL | PRODUCTION | |
| AD7794CRUZ | PRODUCTION | |
| AD7794CRUZ-REEL | PRODUCTION | |
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Jan 20, 2012 - 11_0218 Halogen Free Material Change for Certain TSSOP Products at Carsem |
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| AD7794BRUZ | PRODUCTION | |
| AD7794BRUZ-REEL | PRODUCTION | |
| AD7794CRUZ | PRODUCTION | |
| AD7794CRUZ-REEL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| isoPower 3 | ||
| ADUM5401 | PRODUCTION | Quad-Channel, 2.5 kV Isolators with Integrated DC-to-DC Converter (3/1 channel directionality) |
| ADUM5402 | PRODUCTION | Quad-Channel, 2.5 kV Isolators with Integrated DC-to-DC Converter (2/2 channel directionality) |
| ADUM5403 | PRODUCTION | Quad-Channel, 2.5 kV Isolators with Integrated DC-to-DC Converter (1/3 channel directionality) |
| Series Voltage References 5 | ||
| ADR431 | PRODUCTION | Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
| ADR381 | PRODUCTION | 2.048 V and 2.5 V Bandgap Voltage References |
| AD1582 | PRODUCTION | 2.5V Micropower, Precisions Series Mode Voltage References |
| ADR391 | PRODUCTION | 2.5V Micropower, Low Noise Precision Voltage Reference with Shutdown |
| ADR441 | PRODUCTION | Ultralow Noise, LDO XFET® 2.5V Voltage Reference w/Current Sink and Source |
| Shunt Voltage References 1 | ||
| AD780 | PRODUCTION | 2.5 V/3.0 V High Precision Reference |
| Standard Digital Isolators 5 | ||
| ADUM7440 | PRODUCTION | 1 kV RMS Quad-Channel Digital Isolator |
| ADUM7441 | PRODUCTION | 1 kV RMS Quad-Channel Digital Isolator |
| ADUM7442 | PRODUCTION | 1 kV RMS Quad-Channel Digital Isolator |
| ADUM1400 | PRODUCTION | Quad-Channel Digital Isolator (4/0 Channel Directionality) |
| ADUM1200 | PRODUCTION | Dual-Channel Digital Isolator (2/0 Channel Directionality) |
| USB Isolators 1 | ||
| ADUM4160 | PRODUCTION | Full/Low Speed USB Digital Isolator |
| Parts | Product Life Cycle | Description |
|---|---|---|
| AD7124-8 | RECOMMENDED FOR NEW DESIGNS | 8-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
AD7794 Evaluation Board