Overview
The AD7793BRUZ-REEL, produced by Analog Devices Inc., is a 3-channel, low noise, low power, 24-bit Sigma Delta Analog-to-Digital Converter (ADC) designed for high precision measurement applications. This device integrates a low noise instrumentation amplifier, a precision low noise and low drift internal band gap reference, and programmable excitation current sources. It is ideal for measuring wide dynamic range, low frequency signals such as those in pressure transducers, weigh scales, and temperature measurement applications.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 3 differential analog inputs |
| Resolution | 24-bit |
| ADC Type | Sigma Delta (Σ-Δ) |
| Power Supply | 2.7 V to 5.25 V (AVDD and DVDD) |
| Current Consumption | 400 μA typical |
| Update Rate | 4.17 Hz to 470 Hz (software-programmable) |
| Noise (rms) | 40 nV at 4.17 Hz update rate with gain setting of 64 |
| Reference | Internal 1.17 V or external differential reference |
| Package | 16-lead TSSOP |
Key Features
- Low noise instrumentation amplifier for direct interface with small amplitude signals
- Precision low noise and low drift internal band gap reference
- Programmable excitation current sources and burnout currents
- Bias voltage generator to set common-mode voltage to AVDD/2
- Operable with internal or external clock
- On-chip digital filter with simultaneous 50 Hz and 60 Hz rejection
- Serial interface for communication (CS, DIN, SCLK, and DOUT/RDY)
Applications
- Pressure transducers
- Weigh scales
- Temperature measurement
- Other high precision measurement applications requiring low noise and low power consumption
Q & A
- What is the resolution of the AD7793?
The AD7793 has a resolution of 24 bits. - What is the power supply range for the AD7793?
The power supply range is from 2.7 V to 5.25 V for both AVDD and DVDD. - What is the typical current consumption of the AD7793?
The typical current consumption is 400 μA. - Can the AD7793 use an external reference?
Yes, the AD7793 can use either the internal 1.17 V reference or an external differential reference. - What is the update rate range of the AD7793?
The update rate is software-programmable and ranges from 4.17 Hz to 470 Hz. - What type of ADC does the AD7793 use?
The AD7793 uses a Sigma Delta (Σ-Δ) ADC. - How many channels does the AD7793 have?
The AD7793 has three differential analog inputs. - What is the noise level of the AD7793 at a specific gain setting?
The rms noise is 40 nV at a gain setting of 64 and an update rate of 4.17 Hz. - What package type is the AD7793 available in?
The AD7793 is available in a 16-lead TSSOP package. - Does the AD7793 have on-chip digital filtering?
Yes, the AD7793 includes an on-chip digital filter with simultaneous 50 Hz and 60 Hz rejection.
