LinearLTC214514低功耗125Msps14位模数转换方案.doc
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如有你有帮助，请购买下载，谢谢！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 LTC2145-14 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 applications 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 temperature. 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 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 SNR1 页如有你有帮助，请购买下载，谢谢！90dB SFDRLow Power: 189mW/149mW/113mW Total 95mW/75mW/57mW per ChannelSingle 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 :CommunicationsCellular Base StationsSoftware Defined RadiosPortable Medical ImagingMulti-Channel Data AcquisitionNondestructive Testing2 页如有你有帮助，请购买下载，谢谢！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3 页如有你有帮助，请购买下载，谢谢！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 的前端电路图图 5.LTC2145-14 采用高速差分放大器的前端电路图4 页如有你有帮助，请购买下载，谢谢！图 6.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, LTC2145-12, 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, the5 页如有你有帮助，请购买下载，谢谢！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 frequencies.图 7.1620A 演示板外形图6 页如有你有帮助，请购买下载，谢谢！图 8.1620A 演示板电路图 (1)图 9.1620A 演示板电路图 (2)1620A 演示板材料清单 (BOM):7 页如有你有帮助，请购买下载，谢谢！8 页。
