LTC2446 24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs

The LTC®2446/LTC2447 4-terminal switching enables multiplexed ratiometric measurements. Four sets of selectable differential inputs coupled with four sets of differential reference inputs allow multiple RTDs, bridges and other sensors to be digitized by a single converter. A fifth differential reference input can be selected for any input channel not requiring ratiometric measurements (thermocouples, voltages, current sense, etc.). The flexible input multiplexer allows single-ended or differential inputs coupled with a slaved reference input or a universal reference input.

A proprietary delta-sigma architecture results in absolute accuracy (offset, full-scale, linearity) of 15ppm, noise as low as 200nVRMS and speeds as high as 8kHz. Through a simple 4-wire interface, ten speed/resolution combinations can be selected. The first conversion following a speed, resolution, channel change or reference change is valid since there is no settling time between conversions, enabling scan rates of up to 4kHz. Additionally, a 2x mode can be selected for any speed-enabling output rates up to 8kHz with one cycle of latency.

Protected by U.S. Patents, including 6140950, 6169506, 6208279, 6411242, 6639526

产品特点 Features
  • Five Selectable Differential Reference Inputs
  • Four Differential/Eight Single-Ended Inputs
  • 4-Way MUX for Multiple Ratiometric
  • Measurements
  • Up to 8kHz Output Rate
  • Up to 4kHz Multiplexing Rate
  • Selectable Speed/Resolution: 2µVRMS Noise at 1.76kHz Output Rate 200nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50/60Hz Rejection
  • Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions
  • 0.0005% INL, No Missing Codes
  • Autosleep Enables 20µA Operation at 6.9Hz
  • <5µV Offset (4.5V < VCC < 5.5V, –40°C to 85°C)
  • Differential Input and Differential Reference with GND to VCC Common Mode Range
  • No Latency Mode, Each Conversion is Accurate Even After a New Channel is Selected
  • Internal Oscillator—No External Components
  • LTC2447 Includes MUXOUT/ADCIN for External Buffering or Gain
  • Tiny QFN 5mm x 7mm Package
封装
LTC2446 封装
应用
  • Flow
  • Weight Scales
  • Pressure
  • Direct Temperature Measurement
  • Gas Chromatography
典型应用图
LTC2446 典型应用
参数
LTC2446 参数
LTC2446 订购信息和价格参考Package Variations and Pricing
器件型号 封装 引脚 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量) *
LTC2446CUHF SSOP 38 C $10.64  $7.45 
LTC2446CUHF#PBF SSOP 38 C $10.64  $7.45 
LTC2446CUHF#TR SSOP 38 C $7.55 
LTC2446CUHF#TRPBF SSOP 38 C $7.55 
LTC2446IUHF SSOP 38 I $12.77  $8.94 
LTC2446IUHF#PBF SSOP 38 I $12.77  $8.94 
LTC2446IUHF#TR SSOP 38 I $9.04 
LTC2446IUHF#TRPBF SSOP 38 I $9.04 
LTC2446 数据手册及相关资料下载
  1. 数据手册(英文) : LTC2446/LTC2447 - 24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs.PDF
  2. 可靠性数据 : R461 Reliability Data .PDF
  3. 产品选型卡 : No Latency Delta-Sigma™ ADCs.PDF
  4. 产品选型卡 : LTC2440: 24-Bit High Speed Differential ΔΣ ADC.PDF
  5. 产品新闻发布 (英文) : LTC2446/LTC2447 - Chinese Press Release.PDF
  6. 产品新闻发布 (英文) : LTC2446/LTC2447 - Product Press Release.PDF