Linear公司的LTC2311-16是低噪音高速16位SAR5MspsADC，差分輸入和寬輸入共模范圍，單電源3.3V或5V工作，差分輸入范圍8VP-P，fIN = 2.2MHz時的SNR為81dB，THD為-90dB，16位時±3LSB INL，不會丟失碼，主要用在高速數據采集系統，通信，遙控數據采集，圖像，光網絡，汽車電子和對相馬達控制。本文介紹了LTC2311特性，框圖，應用電路以及演示板2425A主要特性，連接圖，電路圖，材料清單和PCB元件布局圖。

　　The LTCR2311-16 is a low noise， high speed 16-bitsuccessive approximation register （SAR） ADC withdifferential inputs and wide input common mode range.

　　Operating from a single 3.3V or 5V supply， the LTC2311-16 has an 8VP-P differential input range， making it idealfor applications which require a wide dynamic range withhigh common mode rejection. The LTC2311-16 achieves±3LSB INL typical， no missing codes at 16 bits and 81dBSNR typical.

　　The LTC2311-16 has an onboard low drift （20ppm/℃ max）2.048V or 4.096V temperature-compensated reference andprovides an external 1.25V buffered reference input. TheLTC2311-16 also has a high speed SPI-compatible serialinterface that supports CMOS or LVDS. The fast 5Mspsthroughput with one-cycle latency makes the LTC2311-16ideally suited for a wide variety of high speed applications.

　　The LTC2311-16 dissipates only 50mW with a 5V supplyand offers nap and sleep modes to reduce the powerconsumption to 5μW for further power savings duringinactive periods.

　　LTC2311特性：

　　5Msps Throughput Rate

　　±3LSB INL （Typ）， ±8LSB INL Guaranteed

　　Guaranteed 16-Bit， No Missing Codes

　　8VP-P Differential Inputs with Wide Input CommonMode Range

　　81dB SNR （Typ） at fIN = 2.2MHz

　　–90dB THD （Typ） at fIN = 2.2MHz

　　Guaranteed Operation –40℃ to 125℃

　　Single 3.3V or 5V Supply

　　Low Drift （20ppm/℃ Max） 2.048V or 4.096V InternalReference with 1.25V External Reference Input

　　1.8V to 2.5V I/O Voltages

　　CMOS or LVDS SPI-Compatible Serial I/O

　　Power Dissipation 50mW at VDD = 5V （Typ）

　　Small 16-Lead （4mm × 5mm） MSOP Package

　　LTC2311應用：

　　High Speed Data Acquisition Systems

　　Communications

　　Remote Data Acquisition

　　Imaging

　　Optical Networking

　　Automotive

　　Multiphase Motor Control

圖1.LTC2311框圖:CMOS I/O模式

圖2.LTC2311框圖:LVDS I/O模式

　　圖3.LTC2311全差分應用電路

　　演示板2425A

　　Demonstration circuit 2425A features the LTC?2311 family.With up to 5Msps， these differential， single channel， 16-bit，serial， high speed successive approximation register（SAR） ADCs are available in a 16-lead MSOP package.

　　The LTC2311 family has an internal 20ppm/°C maximumdrift reference and an SPI-compatible serial interface thatsupports CMOS and LVDS logic. Note the demo board isconfigured for CMOS operation by default; see the noteunder JP3 for LVDS operation. The following text refersto the LTC2311， but applies to all members of the family，the only difference being the sample rate and/or thenumber of bits. The DC2425A demonstrates the DC andAC performance of the LTC2311 in conjunction with theDC890 PScope? data collection board. Alternatively， byconnecting the DC2425A into a customer application， theperformance of the LTC2311 can be evaluated directly inthat circuit.

圖4.演示板2425A連接示意圖

圖5.演示板2425A電路圖(1)

圖6.演示板2425A電路圖(2)

演示板2425A材料清單(BOM):

圖7.演示板2425A PCB元件布局