[问答]

LTC2145-14低功耗125Msps 14位模数转换方案LTC2145-14主要特性是什么？

问答对人有帮助，内容完整，我也想知道答案 0 LTC2145-14主要特性是什么？LTC2145-14应用电路分析？ 0
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答案对人有帮助，有参考价值 0 Linear公司的LTCR2145-14/LTC2144-14/LTC2143-14是 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 ADC 73.1dB SNR 90dB SFDR Low Power: 189mW/149mW/113mW Total 95mW/75mW/57mW per Channel Single 1.8V Supply CMOS, DDR CMOS, or DDR LVDS Outputs Selectable Input Ranges: 1VP-P to 2VP-P 750MHz Full Power Bandwidth S/H Optional Data Output Randomizer Optional Clock Duty Cycle Stabilizer Shutdown and Nap Modes Serial SPI Port for Configuration 64-Pin (9mm × 9mm) QFN Package LTC2145-14应用: Communications Cellular Base Stations Software Defined Radios Portable Medical Imaging Multi-Channel Data Acquisition Nondestructive 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的前端电路图图5.LTC2145-14采用高速差分放大器的前端电路图图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, 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 frequencies. 图7.1620A演示板外形图图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):

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