Overview
The AD7790BRM, produced by Analog Devices Inc., is a low power, 16-bit buffered Sigma-Delta Analog-to-Digital Converter (ADC). It is designed as a complete analog front end for low frequency measurement applications. The device features a low noise ADC with one differential input that can be configured as buffered or unbuffered, along with a digital Programmable Gain Amplifier (PGA) and on-chip digital filtering. This makes it highly suitable for measuring wide dynamic range, low frequency signals in various applications.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 16-bit |
| Power Supply | 2.5 V to 5.25 V |
| Power Consumption | Normal: 75 μA maximum, Power-down: 1 μA maximum |
| RMS Noise | 1.1 μV at 9.5 Hz update rate |
| Integral Nonlinearity | 3.5 ppm typical |
| Input Configuration | One differential input (buffered or unbuffered) |
| PGA Gains | 1, 2, 4, and 8 |
| Temperature Range | –40°C to +105°C |
| Package | 10-lead Mini Small Outline Package (MSOP) |
| Interface | 3-wire serial SPI®, QSPI™, MICROWIRE™, and DSP compatible |
Key Features
- Low power consumption with normal operation at 75 μA and power-down at 1 μA
- Low noise performance with RMS noise of 1.1 μV at 9.5 Hz update rate
- Integral nonlinearity of 3.5 ppm typical
- Simultaneous 50 Hz and 60 Hz rejection
- Internal clock oscillator
- Programmable gain amplifier (PGA) with gains of 1, 2, 4, and 8
- Rail-to-rail input buffer
- VDD monitor channel
- 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 resolution of the AD7790BRM ADC?
The AD7790BRM has a 16-bit resolution.
- What is the power supply range for the AD7790BRM?
The power supply range is from 2.5 V to 5.25 V.
- What are the typical power consumption levels for the AD7790BRM?
The device consumes 75 μA in normal operation and 1 μA in power-down mode.
- What is the RMS noise level of the AD7790BRM at 9.5 Hz update rate?
The RMS noise level is 1.1 μV at 9.5 Hz update rate.
- What are the available gains for the PGA in the AD7790BRM?
The PGA gains are 1, 2, 4, and 8.
- What is the temperature range for the AD7790BRM?
The temperature range is from –40°C to +105°C.
- What type of package does the AD7790BRM come in?
The device is packaged in a 10-lead Mini Small Outline Package (MSOP).
- What interfaces are supported by the AD7790BRM?
The device supports 3-wire serial SPI®, QSPI™, MICROWIRE™, and DSP compatible interfaces.
- What are some common applications for the AD7790BRM?
Common applications include smart transmitters, battery applications, portable instrumentation, sensor measurement, temperature measurement, pressure measurement, weigh scales, and 4 to 20 mA loops.
- Does the AD7790BRM have internal clock capabilities?
Yes, the AD7790BRM has an internal clock oscillator.
