基于LTC2259-16的16位模-數(shù)轉換方案
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The LTCR2259-16 is a sampling 16-bit A/D converter designed for digitizing high frequency, wide dynamic range signals. It is perfect for demanding communications applications with AC performance that includes 73.1dB SNR and 88dB spurious free dynamic range (SFDR). Ultralow jitter of 0.17psRMS allows undersampling of IF frequencies with excellent noise performance. DC specs include ±4LSB INL (typical) and ±0.5LSB DNL (typical).
The digital outputs can be either full-rate CMOS, doubledata 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 ENCC 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.
LTCR2259-16主要特性:
73.1dB SNR
88dB SFDR
Low Power: 89mW
Single 1.8V Supply
CMOS, DDR CMOS or DDR LVDS Outputs
Selectable Input Ranges: 1VP-P to 2VP-P
800MHz Full-Power Bandwidth S/H
Optional Data Output Randomizer
Optional Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Serial SPI Port for Configuration
40-Pin (6mm x 6mm) QFN Package
LTCR2259-16應用:
Communications
Cellular Base Stations
Software Defi ned Radios
Portable Medical Imaging
Multi-Channel Data Acquisition
Nondestructive Testing
圖1.LTCR2259-16功能方框圖
圖2.LTCR2259-16采用變壓器模擬輸入(5MHz-70MHz)電路圖
圖3.LTCR2259-16 70MHz到170MHz前端輸入電路圖
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