型号ADS1248
品牌
分类精密 ADC
描述用于精密传感器测量的 24 位 2kSPS 8 通道 Δ-Σ ADC
相关操作
产品概述

参数

Resolution (Bits) 24
Sample rate (max) (ksps) 2
Number of input channels 8
Interface type SPI
Architecture Delta-Sigma
Input type Differential, Single-ended
Multichannel configuration Multiplexed
Rating Catalog
Reference mode External, Internal
Input voltage range (max) (V) 2.125, 4.25
Input voltage range (min) (V) -2.125, 0
Features 50/60 Hz Rejection, Excitation Current Sources (iDACs), GPIO, Oscillator, PGA, Temp Sensor
Operating temperature range (°C) -40 to 125
Power consumption (typ) (mW) 2.3
Analog supply (min) (V) 2.7
Analog supply (max) (V) 5.25
Digital supply (min) (V) 2.7
Digital supply (max) (V) 5.25

封装 | 引脚 | 尺寸

TSSOP (PW) 28 62.08 mm² 9.7 x 6.4

特性

  • 24 Bits, No Missing Codes
  • Programmable Data Rates Up to 2 kSPS
  • Single-Cycle Settling for All Data Rates
  • Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS
  • Analog Multiplexer With 8 (ADS1248) and 4
    (ADS1247) Independently Selectable Inputs
  • Low-Noise PGA: 48 nVRMS at PGA = 128
  • Dual-Matched Programmable Excitation Current Sources
  • Low-Drift Internal 2.048-V Reference:
    10 ppm/°C (Maximum)
  • Sensor Burn-Out Detection
  • 4 or 8 General-Purpose I/Os (ADS1247, ADS1248)
  • Internal Temperature Sensor
  • Power Supply and VREF Monitoring (ADS1247, ADS1248)
  • Self and System Calibration
  • SPI™-Compatible Serial Interface
  • Analog Supply: Unipolar (2.7 V to 5.25 V) and Bipolar (±2.5 V) Operation
  • Digital Supply: 2.7 V to 5.25 V
  • Operating Temperature –40°C to 125°C
  • APPLICATIONS
    • Temperature Sensor Measurements:
      • RTDs, Thermocouples, and Thermistors
    • Pressure Measurements
    • Flow Meters
    • Factory Automation and Process Controls

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说明

The ADS1246, ADS1247, and ADS1248 are highly-integrated, precision, 24-bit analog-to-digital converters (ADCs). The devices feature an onboard, low-noise, programmable gain amplifier (PGA), a precision delta-sigma (ΔΣ) ADC with a single-cycle settling digital filter, and an internal oscillator. The ADS1247 and ADS1248 also provide a built-in, very low drift voltage reference with 10-mA output capacity, and two matched programmable current digital-to-analog converters (DACs). The devices provide a complete front-end solution for temperature sensor applications including thermal couples, thermistors, and resistance temperature detectors (RTDs).

An input multiplexer supports four differential inputs for the ADS1248, two for the ADS1247, and one for the ADS1246. In addition, the multiplexer has a sensor burn-out detect, voltage bias for thermocouples, system monitoring, and general-purpose digital I/Os (ADS1247 and ADS1248). The onboard, low-noise PGA provides selectable gains of 1 to 128. The ΔΣ modulator and adjustable digital filter settle in only one cycle, for fast channel cycling when using the input multiplexer, and support data rates up to 2 kSPS. For data rates of 20 SPS or less, both 50-Hz and 60-Hz interference are rejected by the filter.