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LTC2378-18 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2378-18 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LTC2378-18 1 237818f TYPICAL APPLICATION FEATURES DESCRIPTION 18-Bit, 1Msps, Low Power SAR ADC with 102dB SNR The LTC®2378-18 is a low noise, low power, high speed 18-bit successive approximation register (SAR) ADC. Op- erating from a 2.5V supply, the LTC2378-18 has a ±VREF fully differential input range with VREF ranging from 2.5V to 5.1V. The LTC2378-18 consumes only 13.5mW and achieves ±1.75LSB INL maximum, no missing codes at 18 bits with 102dB SNR. The LTC2378-18 has a high speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisy-chain mode. The fast 1Msps through- put with no cycle latency makes the LTC2378-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2378-18 automatically pow- ers down between conversions, leading to reduced power dissipation that scales with the sampling rate. The LTC2378-18 features a unique digital gain compres- sion (DGC) function, which eliminates the driver amplifier’s negative supply while preserving the full resolution of the ADC. When enabled, the ADC performs a digital scaling function that maps zero-scale code from 0V to 0.1 • VREF and full-scale code from VREF to 0.9 • VREF. For a typical reference voltage of 5V, the full-scale input range is now 0.5V to 4.5V, which provides adequate headroom for powering the driving amplifier from a single 5.5V supply. 32k Point FFT fS = 1Msps, fIN = 2kHz APPLICATIONS n 1Msps Throughput Rate n ±1.75LSB INL (Max) n Guaranteed 18-Bit No Missing Codes n Low Power: 13.5mW at 1Msps, 13.5μW at 1ksps n 102dB SNR (typ) at fIN = 2kHz n –124dB THD (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-Lead 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) 0 100 200 300 500 400 –180 –60 –40 –20 –80 –100 –120 –140 –160 0 237818 TA02 SNR = 102.3dB THD = –124dB SINAD = 102.2dB SFDR = 126dB 20Ω VREF 0V VREF 0V 20Ω 3300pF 6800pF 6800pF – + VREF SAMPLE CLOCK 237818 TA01 10μF 0.1μF 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 LTC2378-18 VDD OVDD IN+ IN– L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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