The ADS1285 is a 32-bit, low-power, analog-to-digital converter (ADC), with a programmable gain amplifier (PGA) and a finite impulse response (FIR) filter. The ADC is designed for the demanding needs of seismology equipment requiring low-noise precision digitization and extended battery run time.
The low-noise PGA allows direct connection of geophones and transformer-coupled hydrophones without the need of an external amplifier.
The ADC incorporates a high-resolution, delta-sigma (ΔΣ) modulator and a FIR filter with programmable phase response. The high-pass filter removes dc and low-frequency content from the signal. Clock frequency error is compensated by the sample rate converter with 7ppb resolution.
Choice of power modes optimize dynamic range verses power consumption. Power consumption is further reduced by PGA bypass operation.
The ADC is available in a compact 5mm × 5mm VQFN package and is fully specified over the –40°C to +85°C ambient temperature range.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | ADS1285 32-Bit, Delta-Sigma ADC for Seismic Applications datasheet (Rev. B) | PDF | HTML | 12 Nov 2025 |
| Application note | Digital Filter Types in Delta-Sigma ADCs (Rev. A) | PDF | HTML | 29 Mar 2023 |
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The ADS1285 evaluation module (EVM) performance demonstration kit (PDK) is a platform that combines the ADS1285EVM-PDK and a precision host interface (PHI) controller board. The PHI controller board allows the ADS1285EVM to connect to a computer via a USB port, which interfaces with software that (...)
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RHB) | 32 | Ultra Librarian |
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Precision ADC Design Calculators
Analog Engineer's Calc Installer
General calculator tool for analog design support.
This is the first release of this tool.