[方案]LinearLTC2311-1616位5MspsSARADC办理方案

Linear公司的LTC2311-16是低噪音高速16位 SAR 5Msps ADC,差分输入和宽输入共模范围,单电源3.3V或5V工作,差分输入范围8VP-P,fIN = 2.2MHz时的SNR为81dB,THD为-90dB,16位时±3LSB INL,不会丢失码,主要用在高速数据收罗系统,通信,遥控数据收罗,图像,光网络,汽车电子和对相马达控制.本文先容了LTC2311特点,框架图,应用电路以及演示板2425A主要特点,毗连图,电路图,质料清单和PCB元件结构图.

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特点:

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
 C90dB THD (Typ) at fIN = 2.2MHz
Guaranteed Operation C40℃ 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应用:

High Speed Data Acquisition Systems
Communications
Remote Data Acquisition
Imaging
Optical Networking
Automotive
Multiphase Motor Control

图1.LTC2311框架图:CMOS I/O模式

图2.LTC2311框架图:LVDS I/O模式

图3.LTC2311全差分应用电路

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.

图4.演示板2425A毗连示意图

图5.演示板2425A电路图(1)

图6.演示板2425A电路图(2)
演示板2425A质料清单(BOM):




图7.演示板2425A PCB元件结构
详情请复制打开此衔接地址:
http://cds.linear.com/docs/en/datasheet/231116f.pdf
和http://cds.linear.com/docs/en/demo-board-manual/DC2425AF.PDF
231116f.pdf
DC2425AF.PDF
DC2425A.zip