LTC2145-12/ LTC2144-12/LTC2143-12 12-Bit, 125Msps/105Msps/ 80Msps Low Power Dual ADCs FEATURESDESCRIPTION n 2-Channel Simultaneously Sampling ADC The LTC®2145-12/LTC2144-12/LTC2143-12 are 2-channel n 70.6dB SNR simultaneous sampling 12-bit A/D converters designed n 89dB SFDR for digitizing high frequency, wide dynamic range signals. n Low Power: 183mW/144mW/109mW Total They are perfect for demanding communications applica- 92mW/72mW/55mW per Channel tions with AC performance that includes 70.6dB SNR and n Single 1.8V Supply 89dB spurious free dynamic range (SFDR). Ultralow jitter n CMOS, DDR CMOS, or DDR LVDS Outputs of 0.08psRMS allows undersampling of IF frequencies with n Selectable Input Ranges: 1VP-P to 2VP-P excellent noise performance. n 750MHz Full Power Bandwidth S/H DC specs include ±0.3LSB INL (typ), ±0.1LSB DNL (typ) n Optional Data Output Randomizer and no missing codes over temperature. The transition n Optional Clock Duty Cycle Stabilizer noise is 0.3LSB n Shutdown and Nap Modes RMS. n Serial SPI Port for Configuration The digital outputs can be either full rate CMOS, double n 64-Pin (9mm × 9mm) QFN Package data rate CMOS, or double data rate LVDS. A separate output power supply allows the CMOS output swing to APPLICATIONS range from 1.2V to 1.8V. The ENC+ and ENC– inputs may be driven differentially n Communications or single-ended with a sine wave, PECL, LVDS, TTL, or n Cellular Base Stations CMOS inputs. An optional clock duty cycle stabilizer al- n Software Defined Radios lows high performance at full speed for a wide range of n Portable Medical Imaging clock duty cycles. n Multi-Channel Data Acquisition L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Nondestructive Testing Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 1.8V 1.8V 2-Tone FFT, fIN = 70MHz and 69MHz VDD OVDD 0 –10 –20 CH 1 12-BIT D1_11 –30 ANALOG S/H ADC CORE t INPUT t –40 CMOS, t –50 D1_0 DDR CMOS OR –60 D2_11 DDR LVDS –70 OUTPUT t OUTPUTS CH 2 t DRIVERS AMPLITUDE (dBFS) –80 12-BIT t ANALOG S/H ADC CORE D2_0 –90 INPUT –100 –110 –120 125MHz CLOCK 0 10 20 30 40 50 60 CONTROL CLOCK FREQUENCY (MHz) FREQUENCY (MHz) 21854312 21854312 TA01b TA01b 21454312 TA01a GND OGND 21454312fa 1
