ADS1287

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Low-power 1-kSPS 1-ch delta-sigma ADC with PGA for seismic and energy exploration

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Product details

Parameters

Resolution (Bits) 24 Number of input channels 1 Sample rate (Max) (kSPS) 1 Interface type SPI Architecture Delta-Sigma Input type Differential Multi-channel configuration Rating Catalog Reference mode Ext Input range (Max) (V) 2.5 Input range (Min) (V) 0.156 Features PGA Operating temperature range (C) -40 to 85 Power consumption (Typ) (mW) 4.5 Analog voltage AVDD (Min) (V) -2.5, 0 SNR (dB) 119 Analog voltage AVDD (Max) (V) 2.5, 5 Digital supply (Min) (V) 2.25 Digital supply (Max) (V) 3.6 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

VQFN (RHF) 24 20 mm² 5 x 4 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Selectable Operating Modes
  • High-Resolution Mode:
    • SNR: 113 dB (1000 SPS, Gain = 1)
    • Power: 4.5 mW
  • Low-Power Mode:
    • SNR: 110 dB (1000 SPS, Gain = 1)
    • Power: 2.4 mW
  • THD: –115 dB
  • CMRR: 115 dB
  • High-Impedance CMOS PGA
    • Gains 1, 2, 4, 8, and 16
  • Data Rates: 62.5 SPS to 1000 SPS
  • Flexible Digital Filter:
    • Sinc + FIR + IIR (Selectable)
    • Linear and Minimum Phase Response
    • Programmable High-Pass Filter
  • Offset and Gain Calibration
  • Synchronization Control
  • SPI-Compatible Interface
  • Analog Power Supply: 5 V or ±2.5 V
  • Digital Power Supply: 2.5 V to 3.3 V

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Description

The ADS1287 device is a low-power, analog-to-digital converter (ADC), with an integrated programmable gain amplifier (PGA) and finite-impulse-response (FIR) digital filter. The ADC is suitable for the demanding needs of seismic equipment requiring precision digitizing with low power consumption.

The ADC features a programmable-gain, high-impedance complementary metal oxide semiconductor (CMOS) amplifier, suitable for direct connection of geophone and hydrophone sensors to the ADC over a wide range of input signals (±2.5 V to ±0.156 V).

The ADC incorporates a fourth-order, inherently stable, delta-sigma (ΔΣ) modulator. The modulator digital output is filtered and decimated by the internal FIR digital filter to yield the ADC conversion result.

The FIR digital filter provides data rates up to 1000 samples per second (SPS). The high-pass filter (HPF) removes DC and low frequency components from the conversion result. On-chip gain and offset scaling registers support system calibration.

Together, the amplifier, modulator, and digital filter dissipate 4.5 mW in high-resolution mode (2.4 mW in low-power mode). The ADC is packaged in a compact 5-mm × 4-mm VQFN package. The ADC is fully specified over the –40°C to +85°C temperature range.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet ADS1287 Low-Power, 1000-SPS, Wide-Bandwidth, Analog-to-Digital Converter With Programmable Gain Amplifier datasheet (Rev. B) Aug. 27, 2019
E-book Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
Application note QFN and SON PCB Attachment (Rev. B) Aug. 24, 2018

Design & development

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Design tools & simulation

SIMULATION MODEL Download
SBAM326.ZIP (62 KB) - IBIS Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
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  • Supports simultaneous analysis of multiple products
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SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
CALCULATION TOOL Download
Analog-to-digital converter (ADC) input driver design tool supporting multiple input types
ADC-INPUT-CALC ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and transformer-coupled (...)
CALCULATION TOOL Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — 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 op-amp gain with feedback (...)
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
VQFN (RHF) 24 View options

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