AD4190-4
Analog Devices
AD4190-4 4-Channel, Low Noise, 24- Bit, Sigma-Delta ADC with PGA and Reference
Reference DesignAnalog
Weigh Scale Design Using the AD4190-4 24-Bit Sigma-Delta ADC
Reference design for a precision weigh scale using the AD4190-4 24-bit Sigma-Delta ADC. Includes integrated PGA, low-noise power regulation, and support for 6-wire load cells.
Overview
The CN-0600 reference design describes a high-precision weigh scale system centered on the AD4190-4, a 24-bit Sigma-Delta ADC with an integrated programmable gain amplifier (PGA). The circuit is designed to interface with 4-wire or 6-wire load cells, specifically demonstrated with a 350-ohm load cell at 2mV/V sensitivity. It utilizes a ratiometric configuration to minimize measurement errors from excitation voltage fluctuations. The power management section uses an LTC3129-1 synchronous buck-boost converter and LT1962 low-noise LDO regulators to provide stable 5V and 3.3V rails. The system achieves 17-bit peak-to-peak resolution at 3.87SPS and features built-in diagnostics, including CRC on the SPI interface and signal chain health checks.
Use Cases
- Industrial weighing systems
- Strain gauge measurement
- Precision force sensors
- Laboratory scales
- Electronic balances
Topics
AD4190-4
LT1962
LTC3129-1
Sigma-Delta ADC
weigh scale
load cell
reference design
PGA
ratiometric measurement
CN-0600
Referenced Parts
LTC1962-3.3
Analog Devices
the LTC1962-3.3 generates the 3.3V for IOVDD
LTC1962-5
Analog Devices
The LTC1962-5 low-noise LDO regulator provides a clean 5V for the AVDD
| AD4190-4 | Analog Devices | AD4190-4 4-Channel, Low Noise, 24- Bit, Sigma-Delta ADC with PGA and Reference |
| AD4195-4 | Analog Devices | This circuit note is also applicable to the AD4195-4 |
| LT1962 | Analog Devices | LT1962 Low Noise, Micropower 300 mA LDO Regulator |
| LTC3129-1 | Analog Devices | LTC3129-1 200 mA Synchronous Buck-Boost DC/DC Converter |
| LTC1962-3.3 | Analog Devices | the LTC1962-3.3 generates the 3.3V for IOVDD |
| LTC1962-5 | Analog Devices | The LTC1962-5 low-noise LDO regulator provides a clean 5V for the AVDD |