Datasheet LTC2379-18 (Analog Devices)

LTC2379-18 18-Bit, 1.6Msps, Low Power SAR ADC with 101.2dB SNR
FEATURES DESCRIPTION
n
1.6Msps Throughput Rate
The LTC®2379-18 is a low noise, low power, high speed n
±2LSB INL (Max)
18-bit successive approximation register (SAR) ADC. n
Guaranteed 18-Bit No Missing Codes
Operating from a 2.5V supply, the LTC2379-18 has a n
Low Power: 18mW at 1.6Msps, 18µW at 1.6ksps
±VREF fully differential input range with VREF ranging from n
101.2dB SNR (typ) at fIN = 2kHz
2.5V to 5.1V. The LTC2379-18 consumes only 18mW and n –
120dB THD (typ) at fIN = 2kHz
achieves ±2LSB INL maximum, no missing codes at 18 bits n
Digital Gain Compression (DGC)
with 101.2dB SNR. n Guaranteed Operation to 125°C The LTC2379-18 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 1.6Msps n VREF Input Range from 2.5V to 5.1V throughput with no cycle latency makes the LTC2379-18 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 LTC2379-18 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 LTC2379-18 features a unique digital gain compres- sion (DGC) function, which eliminates the driver amplifier’s n Medical Imaging negative supply while preserving the full resolution of the n High Speed Data Acquisition ADC. When enabled, the ADC performs a digital scaling n Portable or Compact Instrumentation function that maps zero-scale code from 0V to 0.1 • VREF n Industrial Process Control and full-scale code from VREF to 0.9 • VREF. For a typical n Low Power Battery-Operated Instrumentation reference voltage of 5V, the full-scale input range is now n 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. Protected by U.S. Patents including 7705765.
TYPICAL APPLICATION 32k Point FFT fS = 1.6Msps, fIN = 2kHz
0 2.5V 1.8V TO 5V SNR = 101.2dB –20 THD = –120dB SINAD = 101.1dB 10µF 0.1µF –40 SFDR = 121dB –60 V VDD OVDD CHAIN REF 20Ω 3300pF RDL/SDI –80 + IN+ 0V SDO LTC2379-18 SCK –100 V 3300pF REF – BUSY IN– CNV SAMPLE CLOCK AMPLITUDE (dBFS) –120 0V 20Ω 3300pF REF GND REF/DGC VREF –140 2.5V TO 5.1V 237918 TA01 –160 47µF –180 (X5R, 0805 SIZE) 0 100 200 300 400 500 600 700 800 FREQUENCY (kHz) 237918 TA02 237918fb For more information www.linear.com/LTC2379-18 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