LinearLTC214514低功耗125Msps14位模数转换方案

1、Linear LTC2145-14低功耗125Msps 14位模数转换方案关键字：通信技术,无线通信,蜂窝基站,工业控制,数据采集Linear公司的LTCR2145-14/LTC2144-14/LTC2143-14是低功耗2路同时取样的14位模数转换器(ADC),SNR达到73.1dB,SFDR为90dB,取样速率达125Mbps,DC指标包括±1LSB INL, ±0.3LSB DNL,整个温度范围内不会丢失码,CMOS输出摆幅从1.2V到1.8V,主要用在通信,蜂窝基站,软件定义无线电(SDR),手提医疗图像设备,多路数据采集和非破坏性测试.本文介绍了LTC2145-1

2、4主要特性, 功能方框图,典型应用电路以及输入频率5MHz-150MHz, 150MHz-250MHz和大于250MHz的前端电路图, 1620A演示板电路图和材料清单(BOM).The LTCR2145-14/LTC2144-14/LTC2143-14 are 2-channel simultaneous sampling 14-bit A/D converters designed for digitizing high frequency, wide dynamic range signals.They are perfect for demanding communications a

3、pplications with AC performance that includes 73.1dB SNR and 90dB spurious free dynamic range (SFDR). Ultralow jitter of 0.08psRMS allows undersampling of IF frequencies with excellent noise performance.DC specs include ±1LSB INL (typ), ±0.3LSB DNL (typ) and no missing codes over temperatu

4、re. The transition noise is 1.2LSBRMS.The digital outputs can be either full rate CMOS, double data rate CMOS, or double data rate LVDS. A separate output power supply allows the CMOS output swing to range from 1.2V to 1.8V.The ENC+ and ENC inputs may be driven differentially or single-ended with a

5、sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles.LTC2145-14主要特性:Two-Channel Simultaneously Sampling ADC73.1dB SNR90dB SFDRLow Power: 189mW/149mW/113mW Total 95mW/75mW/57mW per ChannelSingle

6、 1.8V SupplyCMOS, DDR CMOS, or DDR LVDS OutputsSelectable Input Ranges: 1VP-P to 2VP-P750MHz Full Power Bandwidth S/HOptional Data Output RandomizerOptional Clock Duty Cycle StabilizerShutdown and Nap ModesSerial SPI Port for Configuration64-Pin (9mm × 9mm) QFN PackageLTC2145-14应用:Communication

7、sCellular Base StationsSoftware Defined RadiosPortable Medical ImagingMulti-Channel Data AcquisitionNondestructive Testing图1.LTC2145-14功能方框图图2.LTC2145-14输入频率5MHz-150MHz的前端电路图图3.LTC2145-14输入频率150MHz-250MHz的前端电路图图4.LTC2145-14输入频率大于250MHz的前端电路图AO-Electronics 傲壹电子 官网： 中文网:图5.LTC2145-14采用高速差分放大器的前端电路图图6.

8、LTC2145-14典型应用电路图1620A演示板Demonstration circuit 1620A supports a family of 16-/14-/12-bit, 25Msps to 125Msps ADCs. Each assembly features one of the following devices: LTC®2185, LTC2184, LTC2183, LTC2182, LTC2181, LTC2180, LTC2145-14, LTC2144-14, LTC2143-14, LTC2142-14, LTC2141-14, LTC2140-14, L

9、TC2145-12, LTC2144-12, LTC2143-12, LTC2142-12, LTC2141-12, or LTC2140-12 high speed, high dynamic range ADCs.Demonstration circuit 1620A supports the LTC2185/LTC2145 family DDR LVDS output mode.The versions of the 1620A demo board supporting the LTC2185 and LTC2145 series of A/D converters. Depending on the required resolution and sample rate, the DC1620A is supplied with the appropriate ADC. The circuitry on the analog inputs is optimized for analog input frequencies from 5MHz to 70MHz. Refer to the data sheet for proper input networks for different input frequ