Overview
The AD7191BRUZ, produced by Analog Devices Inc., is a pin-programmable, ultralow noise, 24-bit sigma-delta analog-to-digital converter (ADC) designed for high precision measurement applications. It serves as a complete analog front end, particularly suited for bridge sensors, and includes a low noise gain stage and a temperature sensor for temperature compensation. The device is controlled by dedicated pins, making it user-friendly and versatile for various measurement needs.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits |
| Output Data Rate | 10 Hz, 50 Hz, 60 Hz, 120 Hz (programmable) |
| PGA Gain | 1, 8, 64, 128 (programmable) |
| Full-Scale Differential Input | ±5 V, ±625 mV, ±78 mV, ±39 mV |
| RMS Noise | 15 nV @ 10 Hz (gain = 128) |
| Noise Free Bits | Up to 21.5 bits (gain = 1) |
| Offset Drift | 5 nV/°C |
| Gain Drift | 1 ppm/°C |
| Power Supply | 3 V to 5.25 V |
| Current Consumption | 4.35 mA |
| Temperature Range | –40°C to +105°C |
| Package | 24-lead TSSOP |
| Interface | 2-wire serial SPI, QSPI™, and MICROWIRE™ compatible |
Key Features
- Pin-programmable output data rate and PGA gain
- Low noise performance with RMS noise of 15 nV @ 10 Hz (gain = 128)
- Up to 21.5 noise-free bits (gain = 1)
- Internal or external clock option
- Simultaneous 50 Hz and 60 Hz rejection at certain output data rates
- Internal temperature sensor for temperature compensation
- Bridge power-down switch
- Schmitt trigger on SCLK for robust interface
Applications
- Weigh scales
- Strain gauge transducers
- Pressure measurement
- Medical and scientific instrumentation
Q & A
- What is the resolution of the AD7191BRUZ?
The AD7191BRUZ has a resolution of 24 bits.
- What are the programmable output data rates of the AD7191BRUZ?
The output data rate can be programmed to 10 Hz, 50 Hz, 60 Hz, or 120 Hz.
- What are the available PGA gains for the AD7191BRUZ?
The PGA gain can be set to 1, 8, 64, or 128.
- What is the power supply range for the AD7191BRUZ?
The device operates with a power supply of 3 V to 5.25 V.
- What is the current consumption of the AD7191BRUZ?
The current consumption is 4.35 mA.
- What is the temperature range of the AD7191BRUZ?
The temperature range is –40°C to +105°C.
- What type of package is the AD7191BRUZ available in?
The device is available in a 24-lead TSSOP package.
- Does the AD7191BRUZ support simultaneous 50 Hz and 60 Hz rejection?
Yes, simultaneous 50 Hz and 60 Hz rejection is obtained when the output data rate is set to 10 Hz or 50 Hz.
- Can the AD7191BRUZ be used with an external clock?
Yes, the AD7191BRUZ can be operated with either an internal or an external clock.
- What interface protocols are supported by the AD7191BRUZ?
The device supports 2-wire serial SPI, QSPI™, and MICROWIRE™ compatible interfaces.
