Overview
The AD7780BRZ, produced by Analog Devices Inc., is a 24-bit, pin-programmable, ultralow power sigma-delta analog-to-digital converter (ADC). This device is designed for measuring wide dynamic range, low frequency signals and is particularly suited for applications requiring high precision and low power consumption. The AD7780BRZ features an on-chip, low noise programmable gain amplifier (PGA) and an on-chip oscillator, making it a complete front-end solution for bridge sensor applications such as weigh scales and pressure sensors.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 24 bits |
| Power Consumption | 330 μA |
| Operating Temperature Range | –40°C to +105°C |
| Power Supply Range | 2.7 V to 5.25 V |
| Update Rates | 10 Hz or 16.7 Hz |
| Gain Settings | 1 or 128 |
| Full-Scale Differential Input | ±5 V or ±39 mV |
| Settling Time (10 Hz Update Rate) | 300 ms |
| Settling Time (16.7 Hz Update Rate) | 120 ms |
| Package Type | 14-lead SOIC, 16-lead TSSOP |
Key Features
- Low power consumption of 330 μA, making it suitable for battery-operated devices.
- On-chip, low noise programmable gain amplifier (PGA) with gain settings of 1 or 128.
- On-chip oscillator and digital filter for precise signal measurement.
- Two update rates: 10 Hz and 16.7 Hz, with simultaneous 50 Hz/60 Hz rejection.
- Power-down mode to extend battery life by switching off the power to the bridge sensor and the AD7780 when not converting.
- Easy-to-use interface with dedicated control pins and a 2-wire interface for data retrieval.
- Internal clock and one buffered differential input.
- High accuracy and low noise performance, with RMS noise as low as 49 nV at the 10 Hz update rate.
Applications
- Weigh scales and load cells.
- Pressure sensors and transducers.
- Strain gage measurements.
- Portable and battery-operated devices requiring high precision and low power consumption.
- Industrial automation and control systems.
Q & A
- What is the resolution of the AD7780BRZ?
The AD7780BRZ has a resolution of 24 bits.
- What are the available update rates for the AD7780BRZ?
The AD7780BRZ offers update rates of 10 Hz and 16.7 Hz.
- What are the gain settings available on the AD7780BRZ?
The AD7780BRZ has gain settings of 1 or 128.
- What is the power consumption of the AD7780BRZ?
The AD7780BRZ consumes 330 μA of power.
- What is the operating temperature range of the AD7780BRZ?
The operating temperature range is –40°C to +105°C.
- What types of packages are available for the AD7780BRZ?
The AD7780BRZ is available in 14-lead SOIC and 16-lead TSSOP packages.
- Does the AD7780BRZ have a power-down mode?
Yes, the AD7780BRZ has a power-down mode to extend battery life.
- What is the purpose of the on-chip PGA in the AD7780BRZ?
The on-chip PGA provides low noise amplification with gain settings of 1 or 128.
- What types of sensors can the AD7780BRZ be used with?
The AD7780BRZ can be used with bridge sensors such as weigh scales, pressure sensors, and strain gages.
- How is data retrieval simplified in the AD7780BRZ?
Data retrieval is simplified through a 2-wire interface.
