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Convertidores analógico-digitales (ADC)
ADC de precisión

ADS1235

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ADC delta-sigma de 24 bits, 7,2 kSPS y 3 canales diferenciales con excitación PGA y AC para sensores

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ADS1235

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Detalles del producto

Resolution (Bits) 24 Sample rate (max) (ksps) 7.2 Number of input channels 5 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External Input voltage range (max) (V) 2.5, 5 Input voltage range (min) (V) -2.5, 0 Features 50/60 Hz Rejection, GPIO, Oscillator, PGA, Temp Sensor Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 23 Analog supply voltage (min) (V) -2.5, 4.75 Analog supply voltage (max) (V) 2.5, 5.25 Digital supply (min) (V) 2.7 Digital supply (max) (V) 5.25
Resolution (Bits) 24 Sample rate (max) (ksps) 7.2 Number of input channels 5 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External Input voltage range (max) (V) 2.5, 5 Input voltage range (min) (V) -2.5, 0 Features 50/60 Hz Rejection, GPIO, Oscillator, PGA, Temp Sensor Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 23 Analog supply voltage (min) (V) -2.5, 4.75 Analog supply voltage (max) (V) 2.5, 5.25 Digital supply (min) (V) 2.7 Digital supply (max) (V) 5.25
VQFN (RHB) 32 25 mm² 5 x 5
  • 24-Bit, High-Precision ADC
    • 120,000 Noise-Free Counts
      (10-mV Input, 10 SPS)
    • Offset Drift: 1 nV/°C
    • Gain Drift: 0.5 ppm/°C
  • Three Differential or Five Single-Ended Inputs
  • Two Reference Inputs
  • Wide Input Voltage Range: ±7 mV to ±5 V
  • Low-Noise PGA, Gain: 1, 64, and 128
  • Data Rate: 2.5 SPS to 7200 SPS
  • AC- or DC-Bridge Excitation Option
  • Chop Mode for Zero Drift Operation
  • Simultaneous 50-Hz and 60-Hz Rejection Mode
  • Single-Cycle Settling Mode
  • Missing Reference Input Monitor
  • Signal Overrange Monitor
  • Temperature Sensor
  • Cyclic Redundancy Check (CRC)
  • 5-V or ±2.5-V Power Supply
  • 24-Bit, High-Precision ADC
    • 120,000 Noise-Free Counts
      (10-mV Input, 10 SPS)
    • Offset Drift: 1 nV/°C
    • Gain Drift: 0.5 ppm/°C
  • Three Differential or Five Single-Ended Inputs
  • Two Reference Inputs
  • Wide Input Voltage Range: ±7 mV to ±5 V
  • Low-Noise PGA, Gain: 1, 64, and 128
  • Data Rate: 2.5 SPS to 7200 SPS
  • AC- or DC-Bridge Excitation Option
  • Chop Mode for Zero Drift Operation
  • Simultaneous 50-Hz and 60-Hz Rejection Mode
  • Single-Cycle Settling Mode
  • Missing Reference Input Monitor
  • Signal Overrange Monitor
  • Temperature Sensor
  • Cyclic Redundancy Check (CRC)
  • 5-V or ±2.5-V Power Supply

The ADS1235 is a precision, 7200-SPS, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with an integrated programmable gain amplifier (PGA). This device also includes diagnostic features such as PGA overrange and reference monitors. The ADC provides high-accuracy, zero-drift conversion data for high-precision equipment, including weigh scales, strain gauges, and resistive pressure sensors.

The ADC has signal and reference multiplexers that support three differential signal inputs and two reference inputs. The ADC also includes a low-noise PGA that provides gains of 1, 64, and 128. The ADC also has a 24-bit ΔΣ modulator and programmable digital filter.

The high-impedance inputs (1 GΩ) of the PGA reduce measurement error that is caused by sensor loading.

The ADC supports ac-bridge excitation to remove the drift errors from the sensor wiring. The ADC provides the clock control signals for the ac-excitation operation.

The flexible digital filter is programmable for single-cycle settled conversions, and provides 50-Hz and 60-Hz line cycle rejection at the same time.

The ADS1235 is available in a 5-mm × 5-mm QFN package, and is specified across the –40°C to +125°C temperature range.

 

The ADS1235 is a precision, 7200-SPS, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with an integrated programmable gain amplifier (PGA). This device also includes diagnostic features such as PGA overrange and reference monitors. The ADC provides high-accuracy, zero-drift conversion data for high-precision equipment, including weigh scales, strain gauges, and resistive pressure sensors.

The ADC has signal and reference multiplexers that support three differential signal inputs and two reference inputs. The ADC also includes a low-noise PGA that provides gains of 1, 64, and 128. The ADC also has a 24-bit ΔΣ modulator and programmable digital filter.

The high-impedance inputs (1 GΩ) of the PGA reduce measurement error that is caused by sensor loading.

The ADC supports ac-bridge excitation to remove the drift errors from the sensor wiring. The ADC provides the clock control signals for the ac-excitation operation.

The flexible digital filter is programmable for single-cycle settled conversions, and provides 50-Hz and 60-Hz line cycle rejection at the same time.

The ADS1235 is available in a 5-mm × 5-mm QFN package, and is specified across the –40°C to +125°C temperature range.

 
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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Fecha
* Data sheet ADS1235 Precision, 3-Channel, Differential-Input, 7200-SPS, 24-Bit Delta-Sigma ADC for Bridge Sensors datasheet PDF | HTML 28 sep 2018
Application note Calculating Conversion Latency and System Cycle Time for Delta-Sigma ADCs (Rev. A) PDF | HTML 18 mar 2024
Application note A Basic Guide to Bridge Measurements (Rev. A) PDF | HTML 13 mar 2024
Application note Digital Filter Types in Delta-Sigma ADCs (Rev. A) PDF | HTML 29 mar 2023
Application note Communication Methods for Data Integrity Using Delta-Sigma Data Converters (Rev. A) PDF | HTML 23 ago 2021
Application brief Reduce Bridge Measurement Offset and Drift Using the AC Excitation Mode (Rev. A) PDF | HTML 01 abr 2021
E-book Fundamentals of Precision ADC Noise Analysis (Rev. A) 19 jun 2020

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

ADS1235EVM — Módulo de evaluación ADS1235

El módulo de evaluación (EVM) ADS1235 es una plataforma para evaluar el convertidor analógico a digital (ADC) ADS1235. ADS1235 es un convertidor analógico a digital sigma-delta (ΔΣ) de baja derivación, 24 bits, 7200 SPS y 6 canales con un amplificador de ganancia programable (PGA) integrado para (...)

Guía del usuario: PDF
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Soporte de software

ADS1235-C-EXAMPLE-CODE — ADS1235 example C code

Expedite your embedded design using this example C code for the ADS1235
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Modelo de simulación

ADS1235 IBIS Model

SBAM401.ZIP (46 KB) - IBIS Model
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Herramienta de cálculo

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

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 (...)

Productos y hardware compatibles

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Herramienta de cálculo

SBAR015 — ADS1235 Design Calculator

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Herramienta de diseño

ADC-DAC-TO-VREF-SELECT-DESIGN-TOOL — The ADC-TO-VREF-SELECT tool enables the pairing of TI ADCs, DACs, and series voltage references.

The ADC-TO-VREF-SELECT tool enables the pairing of TI analog-to-digital converters (ADCs) and series voltage references. Users can select an ADC device and the desired reference voltage, and the tool will list up to two voltage reference recommendations.
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Productos y hardware compatibles
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Herramienta de simulación

PSPICE-FOR-TI — PSpice® para herramienta de diseño y simulación de TI

PSpice® para TI es un entorno de diseño y simulación que ayuda a evaluar la funcionalidad de los circuitos analógicos. Esta completa suite de diseño y simulación utiliza un motor de análisis analógico de Cadence®. Disponible sin ningún costo, PSpice para TI incluye una de las bibliotecas de modelos (...)
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Herramienta de simulación

TINA-TI — Programa de simulación analógica basado en SPICE

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 (...)
Guía del usuario: PDF
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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
VQFN (RHB) 32 Ultra Librarian
Se aplican los Términos y condiciones estándar de TI para los elementos de evaluación.

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL)/reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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Soporte y capacitación

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