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LTC2145-12 - 12-Bit, 125Msps Low Power Dual ADCs

The LTC®2145-12/LTC2144-12/LTC2143-12 are 2-channel simultaneous sampling 12-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 70.6dB SNR and 89dB spurious free dynamic range (SFDR). Ultralow jitter of 0.08psRMS allows undersampling of IF frequencies with excellent noise performance.

DC specs include ±0.3LSB INL (typ), ±0.1LSB DNL (typ) and no missing codes over temperature. The transition noise is 0.3LSBRMS.

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.

Features 2-Channel Simultaneously Sampling ADC 70.6dB SNR 89dB SFDR Low Power: 183mW/144mW/109mW Total 92mW/72mW/55mW 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 Typical Application

Applications Communications Cellular Base Stations Software Defined Radios Portable Medical Imaging Multi-Channel Data Acquisition Nondestructive Testing Packaging

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