Overview
The AD7791BRM is a low-power, 24-bit Sigma-Delta analog-to-digital converter (ADC) manufactured by Analog Devices Inc. This device is designed as a complete analog front end for low-frequency measurement applications. It features a single differential input that can be configured in either buffered or unbuffered mode. The AD7791BRM operates from a power supply of 2.5 V to 5.25 V and is known for its high accuracy and low noise characteristics, making it suitable for a variety of precision measurement tasks.
Key Specifications
| Parameter | Value | Unit | Conditions/Comments |
|---|---|---|---|
| Number of Bits | 24 | - | - |
| Number of Channels | 1 | - | Differential input |
| Sampling Rate | Up to 120 sps | samples per second | - |
| Power Supply | 2.5 V to 5.25 V | V | - |
| Current Consumption (Normal Mode) | 73 µA typ (VDD = 5.25 V, Buffered Mode) | µA | - |
| Current Consumption (Power-Down Mode) | 1 µA max | µA | - |
| RMS Noise | 1.1 µV at 9.5 Hz update rate | µV | - |
| Integral Nonlinearity | 3.5 ppm typical | ppm | - |
| Temperature Range | -40°C to +105°C | °C | - |
| Package | 10-lead MSOP (0.118", 3.00mm Width) | - | - |
| Interface | 3-wire serial SPI®, QSPI™, MICROWIRE™, and DSP compatible | - | - |
Key Features
- Low power consumption with normal mode current as low as 73 µA (typical at VDD = 5.25 V, buffered mode) and power-down mode current of 1 µA maximum.
- High accuracy with 19.5-bit p-p resolution (22 bits effective resolution) and integral nonlinearity of 3.5 ppm typical.
- Simultaneous 50 Hz and 60 Hz rejection for noise immunity.
- Rail-to-rail input buffer and VDD monitor channel.
- Internal clock oscillator, eliminating the need for an external clock source.
- 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
Applications
- Smart transmitters
- Battery applications
- Portable instrumentation
- Sensor measurement
- Temperature measurement
- Pressure measurement
- Weigh scales
- 4 to 20 mA loops.
Q & A
- What is the AD7791BRM?
The AD7791BRM is a 24-bit Sigma-Delta analog-to-digital converter (ADC) designed for low-frequency measurement applications.
- What is the power supply range for the AD7791BRM?
The AD7791BRM operates from a power supply of 2.5 V to 5.25 V.
- What is the typical current consumption of the AD7791BRM in normal mode?
The typical current consumption in normal mode is 73 µA at VDD = 5.25 V in buffered mode.
- What is the current consumption in power-down mode?
The current consumption in power-down mode is 1 µA maximum.
- What is the RMS noise of the AD7791BRM?
The RMS noise is 1.1 µV at a 9.5 Hz update rate.
- What is the integral nonlinearity of the AD7791BRM?
The integral nonlinearity is 3.5 ppm typical.
- What is the temperature range of the AD7791BRM?
The temperature range is -40°C to +105°C.
- What type of package does the AD7791BRM come in?
The AD7791BRM comes in a 10-lead MSOP package (0.118", 3.00mm Width).
- What interfaces does the AD7791BRM support?
The AD7791BRM supports 3-wire serial interfaces including SPI, QSPI, MICROWIRE, and DSP.
- What are some common applications of the AD7791BRM?
Common applications include smart transmitters, battery applications, portable instrumentation, sensor measurement, temperature measurement, pressure measurement, weigh scales, and 4 to 20 mA loops.
