LTC2321-14 Dual, 14-Bit + Sign, 2Msps Differential Input ADC with Wide Input Common Mode Range FeaTuresDescripTion n 2Msps Throughput Rate The LTC®2321-14 is a low noise, high speed dual 14-bit + n ±1LSB INL (Typ) sign successive approximation register (SAR) ADC with n Guaranteed 14-Bit, No Missing Codes differential inputs and wide input common mode range. n 8VP-P Differential Inputs with Wide Input Common Operating from a single 3.3V or 5V supply, the LTC2321- Mode Range 14 has an 8VP-P differential input range, making it ideal n 80dB SNR (Typ) at fIN = 500kHz for applications which require a wide dynamic range with n –90dB THD (Typ) at fIN = 500kHz high common mode rejection. The LTC2321-14 achieves n No-Cycle Latency ±1LSB INL typical, no missing codes at 14 bits and 80dB n Guaranteed Operation to 125°C SNR. n Single 3.3V or 5V Supply The LTC2321-14 has an onboard low drift (20ppm/°C max) n Low Drift (20ppm/°C Max) 2.048V or 4.096V Internal 2.048V or 4.096V temperature-compensated reference. Reference The LTC2321-14 also has a high speed SPI-compatible n 1.8V to 2.5V I/O Voltages serial interface that supports CMOS or LVDS. The fast n CMOS or LVDS SPI-Compatible Serial I/O 2Msps per channel throughput with no-cycle latency n Power Dissipation 33mW/Ch (Typ) makes the LTC2321-14 ideally suited for a wide variety of n Small 28-Lead (4mm × 5mm) QFN Package high speed applications. The LTC2321-14 dissipates only 33mW per channel and offers nap and sleep modes to applicaTions reduce the power consumption to 5μW for further power n savings during inactive periods. High Speed Data Acquisition Systems n Communications L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. n Remote Data Acquisition n Imaging n Optical Networking n Automotive n Multiphase Motor Control Typical applicaTion32k Point FFT f 3.3V OR 5V S = 2Msps, fIN = 500kHz 0 DIFFERENTIAL INPUTS 10µF SNR = 80.2dB NO CONFIGURATION REQUIRED THD = –92.5dB –20 IN+, IN– SINAD = 79.9dB VDD REFOUT1 SFDR = 98.6dB INSTRUMENTATION DIFFERENTIAL 10µF 25Ω –40 VBYP1 AIN1+ 1µF LTC2321-14 –60 REFOUT2 0V 0V 220pF 10µF
VBYP2 –80 1µF BIPOLAR UNIPOLAR AMPLITUDE (dBFS) 25Ω –100 A SDO1 IN1– TO CONTROL AIN2+ SDO2 LOGIC AIN2– CLKOUT (FPGA, CPLD, –120 0V 0V V CMOS/LVDS SCK DSP, ETC.) DD REFINT CNV –140 GND OGND OVDD 1.8V TO 2.5V 0 0.2 0.4 0.6 0.8 1.0 1µF FREQUENCY (MHz) 232114 TA01a 232114 TA01b 232114fc For more information www.linear.com/LTC2321-14 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Converter Characteristics Dynamic Accuracy Internal Reference Characteristics Digital Inputs And Digital Outputs Power Requirements ADC Timing Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Timing Diagram Applications Information Typical Application Package Description Revision History Related Parts
