Overview
The AD7789BRMZ is a 24-bit, single-channel, ultra-low power, sigma-delta analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is designed for low frequency measurement applications and is part of the AD7788/AD7789 family, which includes a 16-bit version (AD7788) as well. The AD7789 is known for its low noise and high resolution, making it suitable for a variety of precision measurement tasks.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits |
| Power Supply | 2.5 V to 5.25 V |
| Power Consumption (Normal) | 75 µA maximum |
| Power Consumption (Power-down) | 1 µA maximum |
| RMS Noise | 1.5 µV |
| Integral Nonlinearity | 3.5 ppm typical |
| Output Data Rate | 16.6 Hz |
| Package Type | 10-Lead MSOP |
| Operating Temperature | -40°C to +105°C |
Key Features
- Low noise and high resolution, with 24-bit effective resolution (21.5 bits for bipolar input range with a 2.5 V reference)
- Simultaneous 50 Hz and 60 Hz rejection
- Internal clock oscillator, eliminating the need for an external clock source
- VDD monitor channel and internal reference
- 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP
- Schmitt trigger on SCLK for improved noise immunity
- Data ready signal (DOUT/RDY) indicating when new data is available
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 resolution of the AD7789BRMZ?
The AD7789BRMZ has a 24-bit resolution, with an effective resolution of 21.5 bits for the bipolar input range with a 2.5 V reference.
- What is the power supply range for the AD7789BRMZ?
The device operates from a single power supply ranging from 2.5 V to 5.25 V.
- What is the typical power consumption of the AD7789BRMZ in normal operation?
The typical power consumption in normal operation is 75 µA maximum.
- Does the AD7789BRMZ require an external clock source?
No, the AD7789BRMZ has an internal clock oscillator and does not require an external clock source.
- What is the output data rate of the AD7789BRMZ?
The output data rate is 16.6 Hz, which allows for simultaneous 50 Hz and 60 Hz rejection.
- What type of interface does the AD7789BRMZ use?
The device uses a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP.
- What is the package type of the AD7789BRMZ?
The device is available in a 10-Lead MSOP package.
- What are some common applications of the AD7789BRMZ?
Common applications include smart transmitters, battery applications, portable instrumentation, sensor measurement, temperature measurement, pressure measurement, weigh scales, and 4 to 20 mA loops.
- What is the operating temperature range of the AD7789BRMZ?
The operating temperature range is -40°C to +105°C.
- How does the AD7789BRMZ indicate when new data is available?
The device uses a data ready signal (DOUT/RDY) to indicate when new data is available.
