LTC2378-16 16-Bit, 1Msps, Low Power SAR ADC with 97dB SNR FeaTuresDescripTion n 1Msps Throughput Rate The LTC®2378-16 is a low noise, low power, high speed n ±0.5LSB INL (Max) 16-bit successive approximation register (SAR) ADC. Op- n Guaranteed 16-Bit No Missing Codes erating from a 2.5V supply, the LTC2378-16 has a ±VREF n Low Power: 13.5mW at 1Msps, 13.5µW at 1ksps fully differential input range with VREF ranging from 2.5V n 97dB SNR (Typ) at fIN = 2kHz to 5.1V. The LTC2378-16 consumes only 13.5mW and n – 122dB THD (Typ) at fIN = 2kHz achieves ±0.5LSB INL maximum, no missing codes at n Digital Gain Compression (DGC) 16 bits with 97dB SNR. n Guaranteed Operation to 125°C The LTC2378-16 has a high speed SPI-compatible serial n 2.5V Supply interface that supports 1.8V, 2.5V, 3.3V and 5V logic n Fully Differential Input Range ±VREF while also featuring a daisy-chain mode. The fast 1Msps n VREF Input Range from 2.5V to 5.1V throughput with no cycle latency makes the LTC2378-16 n No Pipeline Delay, No Cycle Latency ideally suited for a wide variety of high speed applications. n 1.8V to 5V I/O Voltages An internal oscillator sets the conversion time, easing exter- n SPI-Compatible Serial I/O with Daisy-Chain Mode nal timing considerations. The LTC2378-16 automatically n Internal Conversion Clock powers down between conversions, leading to reduced n 16-Lead MSOP and 4mm × 3mm DFN Packages power dissipation that scales with the sampling rate. applicaTions The LTC2378-16 features a unique digital gain compres- n sion (DGC) function, which eliminates the driver amplifier’s Medical Imaging n negative supply while preserving the full resolution of the High Speed Data Acquisition n ADC. When enabled, the ADC performs a digital scaling Portable or Compact Instrumentation n function that maps zero-scale code from 0V to 0.1 • V Industrial Process Control REF n and full-scale code from V Low Power Battery-Operated Instrumentation REF to 0.9 • VREF. For a typical n reference voltage of 5V, the full-scale input range is now ATE 0.5V to 4.5V, which provides adequate headroom for 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 powering the driving amplifier from a single 5.5V supply. property of their respective owners. Typical applicaTion32k Point FFT fS = 1Msps, fIN = 2kHz 2.5V 1.8V TO 5V 0 SNR = 97.2dB 10µF 0.1µF –20 THD = –121.7dB SINAD = 97.1dB –40 SFDR = 128dB V VDD OVDD CHAIN REF 20Ω 6800pF –60 + RDL/SDI IN+ 0V SDO –80 V 3300pF LTC2378-16 SCK REF BUSY –100 – IN– CNV SAMPLE CLOCK 0V 20Ω 6800pF REF GND REF/DGC VREF AMPLITUDE (dBFS) –120 2.5V TO 5.1V 237816 TA01 –140 47µF –160 (X5R, 0805 SIZE) –180 0 100 200 300 400 500 FREQUENCY (kHz) 237816 TA02 237816fa For more information www.linear.com/LTC2378-16 1 Document Outline Features Applications Typical Application Description 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 Board Layout Package Description Revision History Typical Application Related Parts
