Overview
The AD7780BRUZ-REEL, 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 suitable for portable or battery-operated products due to its very low power consumption of 330 μA. The AD7780 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-bit |
| Power Consumption | 330 μA |
| Power Supply Range | 2.7 V to 5.25 V |
| Update Rates | 10 Hz or 16.7 Hz |
| Gain Settings | 1 or 128 |
| Input Range | ±5 V or ±39 mV (differential) |
| Noise (RMS) | 49 nV (10 Hz), 69 nV (16.7 Hz) |
| Package Type | 16-Lead TSSOP |
| Operating Temperature Range | −40°C to +105°C |
Key Features
- Precision 24-bit sigma-delta (Σ-Δ) ADC
- On-chip, low noise programmable gain amplifier (PGA) with gain settings of 1 or 128
- On-chip oscillator
- Two update rates: 10 Hz and 16.7 Hz
- Simultaneous 50 Hz/60 Hz rejection
- Power-down mode to extend battery life
- 2-wire interface for simplified data retrieval
- Internal clock and one buffered differential input
Applications
The AD7780 is ideal for various applications requiring precise measurement of low frequency signals, including:
- Weigh scales
- Pressure sensors
- Strain gages
- Load cell applications
- Portable or battery-operated devices where low power consumption is critical
Q & A
- What is the resolution of the AD7780 ADC?
The AD7780 has a 24-bit resolution. - What are the power consumption and power supply range of the AD7780?
The AD7780 consumes 330 μA and operates with a power supply range of 2.7 V to 5.25 V. - What are the available update rates for the AD7780?
The AD7780 offers update rates of 10 Hz and 16.7 Hz. - What are the gain settings available for the AD7780's PGA?
The PGA has gain settings of 1 or 128. - What is the input range of the AD7780?
The input range is ±5 V or ±39 mV (differential). - Does the AD7780 have any noise reduction features?
Yes, it has simultaneous 50 Hz/60 Hz rejection and provides greater than −45 dB of stop-band attenuation at the 10 Hz update rate. - What package types are available for the AD7780?
The AD7780 is available in a 16-Lead TSSOP package. - What is the operating temperature range of the AD7780?
The operating temperature range is −40°C to +105°C. - How does the AD7780 manage power consumption in idle states?
The AD7780 has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7780 when not converting, thus increasing battery life. - What interface does the AD7780 use for data retrieval?
The AD7780 uses a 2-wire interface for simplified data retrieval.
