Ultra-high-resolution 4-kSPS 1-channel delta-sigma ADC for seismic and energy exploration
Product details
Parameters
Package | Pins | Size
Features
- High Resolution:
- 130dB SNR (250SPS)
- 127dB SNR (500SPS)
- High Accuracy:
- THD: –122dB (typ), –115dB (max)
- INL: 0.6ppm
- Inherently Stable Modulator with Fast Responding Over-Range Detection
- Flexible Digital Filter:
- Sinc + FIR + IIR (Selectable)
- Linear or Minimum Phase Response
- Programmable High-Pass Filter
- Selectable FIR Data Rates:
- 250SPS to 4kSPS
- Filter Bypass Option
- Low Power Consumption:
- Operating: 12mW
- Shutdown: 10µW
- Calibration Engine for Offset and
Gain Correction - SYNC Input
- Analog Supply:
- Unipolar (+5V) or Bipolar (±2.5V)
- Digital Supply: 1.8V to 3.3V
- APPLICATIONS
- Energy Exploration
- Seismic Monitoring
- High-Accuracy Instrumentation
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Description
The ADS1281 is an extremely high-performance, single-chip analog-to-digital converter (ADC) designed for the demanding needs of energy exploration and seismic monitoring environments. The single-chip design promotes board area savings for improvements in high-density applications.
The converter uses a fourth-order, inherently stable, delta-sigma (
) modulator that provides outstanding noise and linearity performance. The modulator is used either in conjunction with the on-chip digital filter, or can be bypassed for use with post-processing filters.
The digital filter consists of sinc and finite impulse response (FIR) low-pass stages followed by an infinite impulse response (IIR) high-pass filter (HPF) stage. Selectable decimation provides data rates from 250 to 4000 samples per second (SPS). The FIR low-pass stage provides both linear and minimum phase response. The HPF features an adjustable corner frequency. On-chip gain and offset scaling registers support system calibration.
The synchronization input (SYNC) can be used to synchronize the conversions of multiple ADS1281s. The SYNC input also accepts a clock input for continuous alignment of conversions from an external source.
Together, the modulator and filter dissipate only 12mW. The ADS1281 is available in a compact TSSOP-24 package and is fully specified from –40°C to +85°C, with a maximum operating range to +125°C.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | High-Resolution A/D Converter datasheet (Rev. D) | Jun. 01, 2010 |
| White papers | Fundamentals of Precision ADC Noise Analysis | Jun. 19, 2020 | |
| User guides | ADS1281EVM, ADS1281EVM-PDK (Rev. D) | May 14, 2016 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
ADCPro™ is a modular software system for evaluating analog-to-digital converters (ADCs) without the need for expensive logic analyzers and complex analysis routines. Used alone it is suitable for performing analysis on data sets captured from ADC testing; when paired with a Texas Instruments (...)
Features
ADCPro software from Texas Instruments will simplify the tasks of collecting and analyzing ADC data, and ease evaluation. With it, you can easily set up an evaluation system that may not exactly replicate the manufacturer's system, but still arrive at meaningful results that can be compared to (...)
Description
The ADS1281EVM-PDK is a complete evaluation/demonstration kit, which combines ADS1281EVM with the DSP-based MMB0 motherboard for use with a personal computer. The MMB0 motherboard allows the ADS1281EVM to connect to a computer via a USB port. The ADS1281EVM-PDK is controlled by the ADCPro&trade (...)
Features
- Easy-to-use evaluation software for Microsoft™ Windows XP and Windows 7
- Built-in analysis tools including scope, FFT, and histogram displays
- Data collection to text files
- Complete control of board settings
- Easily expandable with new analysis plug in tools from Texas Instruments
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
- Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
- (...)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| TSSOP (PW) | 24 | View options |
Ordering & quality
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