Datasheet LTC2368-18 (Analog Devices)

LTC2368-18 18-Bit, 1Msps, Pseudo- Differential Unipolar SAR ADC with 97dB SNR
FEATURES DESCRIPTION
n
1Msps Throughput Rate
The LTC®2368-18 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 LTC2368-18 has a 0V n
Low Power: 13.5mW at 1Msps, 13.5µW at 1ksps
to VREF pseudo-differential unipolar input range with VREF n
97dB SNR (Typ) at fIN = 2kHz
ranging from 2.5V to 5.1V. The LTC2368-18 consumes n –
120dB THD (Typ) at fIN = 2kHz
only 13.5mW and achieves ±2.5LSB INL maximum, no n Guaranteed Operation to 125°C missing codes at 18 bits with 97dB SNR. n 2.5V Supply The LTC2368-18 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 1Msps through- n No Pipeline Delay, No Cycle Latency put with no cycle latency makes the LTC2368-18 ideally n 1.8V to 5V I/O Voltages suited for a wide variety of high speed applications. An n SPI-Compatible Serial I/O with Daisy-Chain Mode internal oscillator sets the conversion time, easing external n Internal Conversion Clock timing considerations. The LTC2368-18 automatical y pow- n 16-Lead MSOP and 4mm × 3mm DFN Packages ers 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 property of their respective owners. Protected by U.S. Patents, including 7705765. n High Speed Data Acquisition n Portable or Compact Instrumentation n Industrial Process Control n Low Power Battery-Operated Instrumentation n ATE
TYPICAL APPLICATION 32k Point FFT fS = 1Msps, fIN = 2kHz
0 2.5V 1.8V TO 5V SNR = 97.2dB –20 THD = –120dB SINAD = 97.1dB 10µF 0.1µF –40 SFDR = 120dB VREF + –60 V 10Ω DD OVDD 0V CHAIN –80 LT®6202 IN+ RDL/SDI – SDO –100 10nF LTC2368-18 SCK IN– BUSY AMPLITUDE (dBFS) –120 CNV SAMPLE CLOCK REF GND –140 236818 TA01a 2.5V TO 5.1V –160 47µF (X5R, 0805 SIZE) –180 0 100 200 300 400 500 FREQUENCY (kHz) 236818 TA01b 236818f 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Converter Characteristics Dynamic Accuracy Reference Input Digital Inputs And Digital Outputs Power Requirements ADC Timing Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Timing Diagram Applications Information Timing Diagrams Board Layout Package Description Typical Application Related Parts