Datasheet LTC2377-18 (Analog Devices)

LTC2377-18 18-Bit, 500ksps, Low Power SAR ADC with 102dB SNR
FEATURES DESCRIPTION
n
500ksps Throughput Rate
The LTC®2377-18 is a low noise, low power, high speed n
±1.75LSB INL (Max)
18-bit successive approximation register (SAR) ADC. Op- n
Guaranteed 18-Bit No Missing Codes
erating from a 2.5V supply, the LTC2377-18 has a ±VREF n
Low Power: 6.8mW at 500ksps, 6.8µW at 500sps
fully differential input range with VREF ranging from 2.5V n
102dB SNR (Typ) at fIN = 2kHz
to 5.1V. The LTC2377-18 consumes only 6.8mW and n –
124dB THD (Typ) at fIN = 2kHz
achieves ±1.75LSB INL maximum, no missing codes at n
Digital Gain Compression (DGC)
18 bits with 102dB SNR. n Guaranteed Operation to 125°C The LTC2377-18 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 500ksps n VREF Input Range from 2.5V to 5.1V throughput with no cycle latency makes the LTC2377-18 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 LTC2377-18 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 LTC2377-18 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.
TYPICAL APPLICATION 32k Point FFT fS = 500ksps, fIN = 2kHz
2.5V 1.8V TO 5V 0 SNR = 102.3dB 10µF 0.1µF –20 THD = –124dB SINAD = 102.2dB –40 SFDR = 125dB V VDD OVDD CHAIN REF 20Ω 6800pF –60 + RDL/SDI IN+ 0V SDO –80 V 3300pF LTC2377-18 SCK REF BUSY –100 – IN– CNV SAMPLE CLOCK 0V 20Ω 6800pF REF GND REF/DGC VREF AMPLITUDE (dBFS) –120 2.5V TO 5.1V 237718 TA01 –140 47µF –160 (X5R, 0805 SIZE) –180 0 50 100 150 200 250 FREQUENCY (kHz) 237718 TA02 237718fa For more information www.linear.com/LTC2377-18 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 Board Layout Package Description Revision History Typical Application Related Parts