AD7794BRUZ - 24-Bit Sigma-Delta ADC, 6-Channel | Analog Devices
MPN: AD7794BRUZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.94 | $6.94 |
| 10 | $6.25 | $62.50 |
| 100 | $5.56 | $556.00 |
| 500 | $5 | $2,500.00 |
| 1,000 | $4.5 | $4,500.00 |
Drop-in alternatives for AD7794BRUZ β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
AD7794BRU
β Drop-Inπ Reference alternative (not in catalog)
AD7794CRUZ
β Drop-Inπ Reference alternative (not in catalog)
AD7793BRUZ
β Drop-Inβ In Stock
$4.95 / Unit
View Datasheet βAD7731BRUZ
β Drop-Inπ Reference alternative (not in catalog)
AD7730BR
β Drop-Inπ Reference alternative (not in catalog)
AD7794BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 24 Bit |
| Number of Inputs | 6 Differential |
| Input Type | Differential |
| Data Interface | SPI |
| Sampling Rate | 470 SPS |
| Voltage Supply | 2.7V to 5.25V |
| Operating Temperature | -40Β°C to +105Β°C |
| Package | 24-TSSOP |
| Mounting Type | Surface Mount |
| Number of Bits | 24 |
| Number of A/D Converters | 1 |
| Reference Type | Internal, External |
| Ratio - S/H:ADC | 1:1 |
| Architecture | Sigma-Delta |
| RoHS Status | Compliant |
AD7794BRUZ Pin Configuration
| Pin 1 | SCLK β Serial Clock Input |
| Pin 2 | DIN β Serial Data Input |
| Pin 3 | DOUT/RDY β Serial Data Output / Ready |
| Pin 4 | CS β Chip Select |
| Pin 5 | SYNC β Synchronization Input |
| Pin 6 | GND β Ground |
| Pin 7 | AVDD β Analog Power Supply |
| Pin 8 | AIN1(+) β Analog Input 1 Positive |
| Pin 9 | AIN1(-) β Analog Input 1 Negative |
| Pin 10 | AIN2(+) β Analog Input 2 Positive |
| Pin 11 | AIN2(-) β Analog Input 2 Negative |
| Pin 12 | AIN3(+) β Analog Input 3 Positive |
| Pin 13 | AIN3(-) β Analog Input 3 Negative |
| Pin 14 | AIN4(+) β Analog Input 4 Positive |
| Pin 15 | AIN4(-) β Analog Input 4 Negative |
| Pin 16 | AIN5(+) β Analog Input 5 Positive |
| Pin 17 | AIN5(-) β Analog Input 5 Negative |
| Pin 18 | AIN6(+) β Analog Input 6 Positive |
| Pin 19 | AIN6(-) β Analog Input 6 Negative |
| Pin 20 | REFIN1(+) β Reference Input 1 Positive |
| Pin 21 | REFIN1(-) β Reference Input 1 Negative |
| Pin 22 | REFIN2(+) β Reference Input 2 Positive |
| Pin 23 | REFIN2(-) β Reference Input 2 Negative |
| Pin 24 | DVDD β Digital Power Supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD7794BRUZ is suitable for 6 applications: Process Control, Temperature Measurement, Weigh Scales, Portable Instrumentation, Pressure Sensing, Data Acquisition Systems.
Process Control
The AD7794BRUZ is ideal for process control systems that require high accuracy measurement of analog signals. Its 24-bit resolution and low noise ensure precise monitoring of temperature, pressure, and flow. The on-chip in-amp allows direct connection of sensors with small output signals, simplifying the analog front end. The device's SPI interface enables easy integration with microcontrollers for data logging and control. Its low power consumption is beneficial for remote or battery-powered process transmitters.
Recommended
Temperature Measurement
The AD7794BRUZ is well-suited for temperature measurement using thermocouples, RTDs, and thermistors. Its programmable gain amplifier (PGA) with gains up to 128 amplifies small sensor signals, while the internal reference provides a stable voltage for ratiometric measurements. The device includes a temperature sensor for cold-junction compensation, making it a complete solution for thermocouple interfaces. The 50Hz/60Hz rejection filter minimizes power line interference, ensuring accurate readings in industrial environments.
Recommended
Weigh Scales
The AD7794BRUZ is commonly used in weigh scale applications due to its high resolution and low noise. The on-chip in-amp and PGA allow direct connection of load cells, which produce small differential voltages. The device's 24-bit resolution provides the accuracy needed for precise weight measurements. The internal reference and excitation current sources simplify the bridge excitation circuit. The low power consumption is advantageous for portable scales, and the SPI interface allows easy calibration and data retrieval.
Recommended
Portable Instrumentation
The AD7794BRUZ is ideal for portable instrumentation due to its low power consumption of 500 Β΅A typical. It operates from a 2.7V to 5.25V supply, making it compatible with battery-powered systems. The small 24-TSSOP package saves board space, and the SPI interface minimizes pin count. The device's high resolution and low noise ensure accurate measurements in field instruments such as data loggers, handheld meters, and portable analyzers. The internal reference reduces external component count, further simplifying the design.
Recommended
Pressure Sensing
The AD7794BRUZ is suitable for pressure sensing applications that require high accuracy and stability. Its 24-bit resolution and low noise enable precise measurement of pressure transducer outputs. The on-chip in-amp and PGA allow direct connection of bridge-type pressure sensors, while the internal reference provides a stable excitation voltage. The device's low power consumption is beneficial for battery-powered pressure transmitters. The SPI interface facilitates digital communication with microcontrollers for pressure monitoring and control systems.
Recommended
Data Acquisition Systems
The AD7794BRUZ is a key component in data acquisition systems that require high-resolution analog-to-digital conversion. Its six differential inputs allow multiple sensors to be connected to a single ADC, reducing system complexity. The device's low noise and high accuracy ensure reliable data capture in industrial and laboratory environments. The SPI interface enables high-speed communication with host processors, and the internal reference simplifies the design. The AD7794BRUZ is suitable for applications such as environmental monitoring, test and measurement, and scientific instrumentation.
Recommended
Recommended Products Summary
Engineering reference data for AD7794BRUZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7794BRU | AD7794CRUZ | AD7793BRUZ | AD7731BRUZ | AD7730BR |
|---|---|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Number of Inputs | 6 Differential | 6 Differential | 6 Differential | 3 Differential | 3 Differential | 2 Differential |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V |
| Data Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| Operating Temperature | -40Β°C to +105Β°C | -40Β°C to +105Β°C | -40Β°C to +125Β°C | -40Β°C to +105Β°C | -40Β°C to +105Β°C | -40Β°C to +105Β°C |
| RoHS | Compliant | Non-compliant | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Six differential input channels (vs AD7793BRUZ)
- RoHS compliant (vs AD7794BRU)
- Lower power consumption (vs AD7794CRUZ)
Design Notes
Decouple the AVDD and DVDD pins with 0.1 Β΅F ceramic capacitors placed as close to the pins as possible. Additionally, use a 10 Β΅F tantalum capacitor on AVDD for low-frequency decoupling. The analog and digital supplies should be separated to minimize noise coupling.
Use a solid ground plane for the analog section and connect the GND pin directly to it. Avoid routing digital signals under the analog inputs. Keep the SPI lines away from analog input traces to prevent crosstalk.
Ensure the reference inputs are properly bypassed with 0.1 Β΅F capacitors. If using the internal reference, connect the REFIN pins to AVDD and GND as per the datasheet. Do not leave unused analog inputs floating; tie them to GND or AVDD to avoid noise.
Compliance Information
RoHS compliant per distributor listings. Lead-free indicated by 'Z' suffix.
