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LTC1992 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1992 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LTC2379-18 1 237918p TYPICAL APPLICATION FEATURES DESCRIPTION 18-Bit, 1.6Msps, Low Power SAR ADC with 101dB SNR The LTC®2379-18 is a low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2379-18 has a ± VREF fully differential input range with VREF ranging from 2.5V to 5.1V. The LTC2379-18 consumes only 18mW and achieves ±2LSB INL maximum, no missing codes at 18-bits with 101dB SNR. The LTC2379-18 has a high speed SPI-compatible se- rial interface that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisychain mode. The fast 1.6Msps throughput with no cycle latency makes the LTC2379-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing exter- nal timing considerations. The LTC2379-18 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate. The LTC2379-18 offers a digital gain compression (DGC) feature that allows a full-scale input to be achieved with inputs that swing between 10% and 90% of the ±VREF analog input range. This allows the input buffer ampli- fier to be operated from a single positive supply without headroom issues, resulting in a lower power system. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 32k Point FFT fS = 1.6Msps, fIN = 2kHz APPLICATIONS n 1.6Msps Throughput Rate n ±2LSB INL (Max) n Guaranteed 18-Bit No Missing Codes n Low Power: 18mW at 1.6Msps, 18μW at 1.6ksps n 101dB SNR (typ) at fIN = 2kHz n Digital Gain Compression (DGC) n Guaranteed Operation to 125°C n 2.5V Supply n Fully Differential Input Range ±VREF n VREF Input Range from 2.5V to 5.1V n No Pipeline Delay, No Cycle Latency n 1.8V to 5V I/O Voltages n SPI-Compatible Serial I/O with Daisy-Chain Mode n Internal Conversion Clock n 16-pin MSOP and 4mm × 3mm DFN Packages n Medical Imaging n High Speed Data Acquisition n Portable or Compact Instrumentation n Industrial Process Control n Low Power Battery-Operated Instrumentation n ATE FREQUENCY (kHz) 0 100 200 300 400 800 700 600 500 –180 –60 –40 –20 –80 –100 –120 –140 –160 0 237918 TA02 SNR = 101.2dB THD = –120dB SINAD = 101.1dB SFDR = 121dB 20Ω VREF 0V VREF 0V 20Ω 3300pF 3300pF 3300pF – + VREF SAMPLE CLOCK 237918 TA01 10μF 2.5V REF 1.8V TO 5V 2.5V TO 5.1V 47μF (X5R, 0805 SIZE) REF GND CHAIN RDL/SDI SDO SCK BUSY CNV REF/DGC LTC2379-18 VDD OVDD IN+ IN– Electrical Specifications Subject to Change |
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