ADS1285
32-bit high-resolution two-channel delta-sigma ADC for seismic and geospace exploration
ADS1285
- Selectable resolution-power modes:
- Dynamic range: 134 dB at 2 ms, 11.5 mW
- Dynamic range: 129 dB at 2 ms, 4.8 mW
- Flexible digital filter:
- Selectable sinc + FIR + IIR
- Linear or minimum phase
- High-pass filter
- THD: < –120 dB
- CMRR: 125 dB
- Data rates: 125 SPS to 4000 SPS
- Programmable gains: 1 to 64
- PGA bypass option
- SYNC input
- Clock error compensation
- Two-channel multiplexer
- Offset and gain calibration
- General-purpose digital I/Os
- Analog supply operation: 5 V, 3.3 V, or ±2.5 V
- Reference voltage options: 5 V, 4.096 V, or 2.5 V
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 7-ppb 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 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +85°C ambient temperature range.
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | ADS1285 32-Bit, Delta-Sigma ADC for Seismic Applications datasheet (Rev. A) | PDF | HTML | 12 Dec 2022 |
Application note | Digital Filter Types in Delta-Sigma ADCs (Rev. A) | PDF | HTML | 29 Mar 2023 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
ADS1285EVM-PDK — ADS1285 performance demonstration kit for 32-bit high-resolution two-channel delta-sigma ADC
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 (...)
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Precision op amps (Vos<1mV)
General-purpose op amps
Audio op amps
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Power op amps
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Line drivers
Transconductance amplifiers & laser drivers
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Biosensing AFEs
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Instrumentation amplifiers
Audio line receivers
Analog current-sense amplifiers
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Analog current-sense amplifiers with integrated shunt resistor
Digital power monitors with integrated shunt resistor
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Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
VQFN (RHB) | 32 | Ultra Librarian |
Ordering & quality
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