LTC2369-18 18-Bit, 1.6Msps, Pseudo- Differential Unipolar SAR ADC with 96.5dB SNR FEATURESDESCRIPTION n 1.6Msps Throughput Rate The LTC®2369-18 is a low noise, low power, high speed n ±2.5LSB INL (Max) 18-bit successive approximation register (SAR) ADC. n Guaranteed 18-Bit No Missing Codes Operating from a 2.5V supply, the LTC2369-18 has a 0V n Low Power: 18mW at 1.6Msps, 18μW at 1.6ksps to VREF pseudo-differential unipolar input range with VREF n 96.5dB SNR (Typ) at fIN = 2kHz ranging from 2.5V to 5.1V. The LTC2369-18 consumes only n – 120dB THD (Typ) at fIN = 2kHz 18mW and achieves ±2.5LSB INL maximum, no missing n Guaranteed Operation to 125°C codes at 18 bits with 96.5dB SNR. n 2.5V Supply The LTC2369-18 has a high speed SPI-compatible serial n Pseudo-Differential Unipolar Input Range: 0V to VREF interface that supports 1.8V, 2.5V, 3.3V and 5V logic while n VREF Input Range from 2.5V to 5.1V also featuring a daisy-chain mode. The fast 1.6Msps n No Pipeline Delay, No Cycle Latency throughput with no cycle latency makes the LTC2369-18 n 1.8V to 5V I/O Voltages ideally suited for a wide variety of high speed applications. n SPI-Compatible Serial I/O with Daisy-Chain Mode An internal oscillator sets the conversion time, easing exter- n Internal Conversion Clock nal timing considerations. The LTC2369-18 automatically n 16-Lead MSOP and 4mm × 3mm DFN Packages powers down between conversions, leading to reduced power dissipation that scales with the sampling rate. APPLICATIONS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Medical Imaging SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the n High Speed Data Acquisition property of their respective owners. Protected by U.S. Patents including 7705765. n Portable or Compact Instrumentation n Industrial Process Control n Low Power Battery-Operated Instrumentation n ATE TYPICAL APPLICATION32k Point FFT fS = 1.6Msps, fIN = 2kHz 2.5V 1.8V TO 5V 0 SNR = 96.5dB –20 THD = –127dB 10μF 0.1μF SINAD = 96.5dB –40 SFDR = 134dB VREF + –60 V 5.1Ω DD OVDD 0V CHAIN LT®6202 IN+ RDL/SDI –80 – SDO 10nF LTC2369-18 –100 SCK IN– BUSY –120 SAMPLE CLOCK AMPLITUDE (dBFS) CNV REF GND –140 236918 TA01a 2.5V TO 5.1V –160 47μF (X5R, 0805 SIZE) –180 0 100 200 300 400 500 600 700 800 FREQUENCY (kHz) 236918 TA01b 236918fa 1
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