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	应用 Weight Scales Direct Temperature Measurement Gas Analyzers Strain-Gage Transducers Instrumentation Data Acquisition Industrial Process Control 4-Digit DVMs 典型应用图参数

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

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

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

数据手册(英文) : LTC2424/LTC2428 - 4-/8-Channel 20-Bit µPower No Latency Delta-Sigma ADC.PDF
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
可靠性数据 : R380 Reliability Data .PDF
产品选型卡 : No Latency Delta-Sigma™ ADCs.PDF
产品选型卡 : Ultra-Tiny 16-Bit ΔΣ ADC Family.PDF
LT Journal: Mar 2007 - Easy Drive Delta-Sigma ADCs Deliver Powerful Features and Reduce Design Effort.PDF