Overview
The AD7794BRUZ-REEL, produced by Analog Devices Inc., is a low power, low noise, complete analog front end designed for high precision measurement applications. This device features a 24-bit Σ-Δ analog-to-digital converter (ADC) with six differential analog inputs, making it suitable for a wide range of precision measurement tasks. The AD7794 includes a low noise instrumentation amplifier, a precision internal band gap reference, and the ability to accept up to two external differential references. It is housed in a 24-lead Thin Shrink Small Outline Package (TSSOP) and operates with a power supply from 2.7 V to 5.25 V.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Output Update Rate | 4.17 to 470 Hz | - | Settling time = 2/output update rate |
| Resolution | 24 Bits | - | - |
| Integral Nonlinearity | ±15 ppm of FSR | - | max |
| Offset Error | ±1 μV | - | typ |
| Offset Error Drift vs. Temperature | ±10 nV/°C | - | typ |
| Full-Scale Error | ±10 μV | - | typ |
| Gain Drift vs. Temperature | ±1 ppm/°C | - | typ, gain = 1 to 16, external reference |
| Power Supply Rejection | 100 dB | - | min, AIN = 1 V/gain, gain ≥ 4, external reference |
| Power Supply | 2.7 V to 5.25 V | - | - |
| Temperature Range | –40°C to +105°C (B grade) | - | - |
| Current Consumption | 400 μA | - | typ |
| Package | 24-lead TSSOP | - | - |
Key Features
- Low Noise Σ-Δ ADC: 24-bit resolution with low noise performance.
- Six Differential Analog Inputs: Suitable for multiple measurement channels.
- Internal Band Gap Reference: Precision reference with 4 ppm/°C drift typical.
- Programmable Excitation Current Sources: For driving external sensors.
- Burnout Currents and Bias Voltage Generator: Enhances sensor protection and common-mode voltage setting.
- Low-Side Power Switch: For powering down bridge sensors to minimize power consumption.
- Simultaneous 50 Hz/60 Hz Rejection: Reduces noise from power line frequencies.
- Independent Interface Power Supply: Allows for flexible power management.
- 3-Wire Serial Interface (SPI, QSPI, MICROWIRE, DSP Compatible): Easy integration with various microcontrollers.
Applications
- Temperature Measurement: High precision temperature sensing.
- Pressure Measurement: Suitable for pressure sensors and transducers.
- Weigh Scales and Strain Gage Transducers: Accurate weight and strain measurements.
- Gas Analysis and Industrial Process Control: Precise measurements in industrial environments.
- Instrumentation and Blood Analysis: Used in medical and laboratory instruments.
- Smart Transmitters and Liquid/Gas Chromatography: Advanced measurement solutions in various fields.
Q & A
- What is the resolution of the AD7794BRUZ-REEL?
The AD7794BRUZ-REEL has a 24-bit resolution.
- What is the temperature range for the B-grade AD7794?
The B-grade AD7794 operates from –40°C to +105°C.
- What is the power supply range for the AD7794BRUZ-REEL?
The power supply range is from 2.7 V to 5.25 V.
- How many differential analog inputs does the AD7794BRUZ-REEL have?
The device has six differential analog inputs.
- What is the typical current consumption of the AD7794BRUZ-REEL?
The typical current consumption is 400 μA.
- Does the AD7794BRUZ-REEL support external references?
Yes, it can accept up to two external differential references.
- What is the output update rate range of the AD7794BRUZ-REEL?
The output update rate ranges from 4.17 Hz to 470 Hz.
- What type of package does the AD7794BRUZ-REEL come in?
The device is housed in a 24-lead Thin Shrink Small Outline Package (TSSOP).
- Is the AD7794BRUZ-REEL compatible with various serial interfaces?
Yes, it is compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.
- What are some common applications of the AD7794BRUZ-REEL?
Common applications include temperature measurement, pressure measurement, weigh scales, strain gage transducers, gas analysis, industrial process control, instrumentation, blood analysis, smart transmitters, and liquid/gas chromatography.
