Linear LTC2380－24 24位低功耗SAR ADC解决方案

Linear公司的LTC2380-24是集成了数字滤波器的24位低功耗SAR ADC,取样速率.5Msps/2Msps,工作电压2.5V,2Msps时的功耗28mW,1.5Msps时的SNR为100dB,fIN = 2kH的THD为-117dB,30.5sps时的动态范围为145dB,主要用在地震學,能源勘探,医疗图像,高速数据采集,工业过程控制和ATE.本文介绍了LTC2380-24主要特性,功能框图,LTC2380-24和LTC6362连接电路图以及演示板DC2289A特性,电路图,材料清单和PB设计图.
The LTCR2380-24 is a low noise, low power, high speed24-bit successive approximation register (SAR) ADC withan integrated digital averaging filter. Operating from a 2.5Vsupply, the LTC2380-24 has a ±VREF fully differential inputrange with VREF ranging from 2.5V to 5.1V. The LTC2380-24 consumes only 28mW and achieves ±3.5ppm INLmaximum and no missing codes at 24 bits.
The LTC2380-24 has an easy to use integrated digitalaveraging filter that can average 1 to 65536 conversionresults real-time, dramatically improving dynamic rangefrom 101dB at 1.5Msps to 145dB at 30.5sps. No separateprogramming interface or configuration register is required.
The high speed SPI-compatible serial interface supports1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisychainmode. The LTC2380-24 automatically powers downbetween conversions, reducing power dissipation at lowersampling rates.
LTC2380-24主要特性:
Guaranteed 24-Bits No Missing Codes
±0.5ppm INL (Typ)
Integrated Digital Filter with Real-Time Averaging
Low Power: 28mW at 2Msps
100dB SNR (Typ) at 1.5Msps
145dB Dynamic Range (Typ) at 30.5sps
–117dB THD (Typ) at fIN = 2kHz
50Hz/60Hz Rejection
Digital Gain Compression (DGC)
Guaranteed Operation to 85℃
Single 2.5V Supply
Fully Differential Input Range Up to ±5V
1.8V to 5V SPI-Compatible Serial I/O with Daisy-Chain Mode
16-Lead MSOP and 4mm × 3mm DFN Packages
LTC2380-24应用:
Seismology
Energy Exploration
Medical Imaging
High Speed Data Acquisition
Industrial Process Control
ATE

图1.LTC2380-24功能框图