LTC2428 4-/8-Channel 20-Bit µPower No Latency Delta-Sigma™ ADC

The LTC®2424/LTC2428 are 4-/8-channel 2.7V to 5.5V micropower 20-bit A/D converters with an integrated oscillator, 8ppm INL and 1.2ppm RMS noise. They use delta-sigma technology and provide single cycle digital filter settling time (no latency delay) for multiplexed applications. The first conversion after the channel is changed is always valid. Through a single pin the LTC2428/LTC2428 can be configured for better than 110dB rejection at 50Hz or 60Hz ±2%, or can be driven by an external oscillator for a user defined rejection frequency in the range 1Hz to 800Hz. The internal oscillator requires no external frequency setting components.

The converters accept any external reference voltage from 0.1V to VCC. With their extended input conversion range of -12.5% VREF to 112.5% VREF (VREF = FSSET - ZSSET) the LTC2424/LTC2428 smoothly resolve the offset and overrange problems of preceding sensors or signal conditioning circuits.

The LTC2424/LTC2428 communicate through a flexible 4-wire digital interface which is compatible with SPI and MICROPOWER™ protocols

产品特点 Features
  • Pin Compatible 4-/8-Channel 20-Bit ADCs
  • 8ppm INL, No Missing Codes at 20 Bits
  • 4ppm Full-Scale Error and 0.5ppm Offset
  • 1.2ppm Noise
  • Digital Filter Settles in a Single Cycle. Each
  • Conversion is Accurate, Even After Changing Channels
  • Fast Mode: 16-Bit Noise, 12-Bit TUE at 100sps
  • Internal Oscillator—No External Components Required
  • 110dB Min, 50Hz/60Hz Notch Filter
  • Reference Input Voltage: 0.1V to VCC
  • Live Zero—Extended Input Range Accommodates
  • 12.5% Overrange and Underrange
  • Single Supply 2.7V to 5.5V Operation
  • Low Supply Current (200µA) and Auto Shutdown
  • Can Be Interchanged with 24-Bit LTC2404/LTC2408
  • if ZSSET Pin is Grounded
封装
LTC2428 封装
应用
  • Weight Scales
  • Direct Temperature Measurement
  • Gas Analyzers
  • Strain-Gage Transducers
  • Instrumentation
  • Data Acquisition
  • Industrial Process Control
  • 4-Digit DVMs
典型应用图
LTC2428 典型应用
参数
LTC2428 参数
LTC2428 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) *
LTC2428CG SSOP 28 C $5.65  $4.75 
LTC2428CG#PBF SSOP 28 C $5.65  $4.75 
LTC2428CG#TR SSOP 28 C $4.85 
LTC2428CG#TRPBF SSOP 28 C $4.85 
LTC2428IG SSOP 28 I $6.20  $5.25 
LTC2428IG#PBF SSOP 28 I $6.20  $5.25 
LTC2428IG#TR SSOP 28 I $5.35 
LTC2428IG#TRPBF SSOP 28 I $5.35 
LTC2428 数据手册及相关资料下载
  1. 数据手册(英文) : LTC2424/LTC2428 - 4-/8-Channel 20-Bit µPower No Latency Delta-Sigma ADC.PDF
  2. 设计要点 (英文) : DN237 - 1- and 2-Channel No Latency Delta Sigma, 24-Bit ADCs Easily Digitize a Variety of Sensors, Part 2.PDF
  3. 可靠性数据 : R380 Reliability Data .PDF
  4. 产品选型卡 : No Latency Delta-Sigma™ ADCs.PDF
  5. 产品选型卡 : Ultra-Tiny 16-Bit ΔΣ ADC Family.PDF
  6. LT Journal: Mar 2007 - Easy Drive Delta-Sigma ADCs Deliver Powerful Features and Reduce Design Effort.PDF