Datasheet LTC2376-20 (Analog Devices)

LTC2376-20 20-Bit, 250ksps, Low Power SAR ADC with 0.5ppm INL
FeaTures DescripTion
n
250ksps Throughput Rate
The LTC®2376-20 is a low noise, low power, high speed n
±0.5ppm INL (Typ)
20-bit successive approximation register (SAR) ADC. Op- n
Guaranteed 20-Bit No Missing Codes
erating from a 2.5V supply, the LTC2376-20 has a ±VREF n
Low Power: 5.3mW at 250ksps, 5.3µW at 250sps
fully differential input range with VREF ranging from 2.5V n
104dB SNR (Typ) at f
to 5.1V. The LTC2376-20 consumes only 5.3mW and
IN = 2kHz
n
–125dB THD (Typ) at f
achieves ±2ppm INL maximum, no missing codes at 20
IN = 2kHz
n
Digital Gain Compression (DGC)
bits with 104dB SNR. n Guaranteed Operation to 85°C The LTC2376-20 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 250ksps n VREF Input Range from 2.5V to 5.1V throughput with no cycle latency makes the LTC2376-20 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 LTC2376-20 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. The LTC2376-20 features a unique digital gain compres-
applicaTions
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 powering the driving amplifier from a single 5.5V supply. SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents Pending. Protected by U.S. Patents, including 7705765, 7961132, 8319673.
Typical applicaTion Integral Nonlinearity vs Output Code
2.0 2.5V 1.8V TO 5V 1.5 10µF 0.1µF 1.0 V 6800pF VDD OVDD CHAIN 0.5 REF 10Ω + RDL/SDI IN+ 0V SDO 0 V 3300pF LTC2376-20 SCK REF BUSY –0.5 – IN– CNV SAMPLE CLOCK INL ERROR (ppm) 0V 10Ω 6800pF REF GND REF/DGC VREF –1.0 2.5V TO 5.1V 237620 TA01 –1.5 47µF (X7R, 1210 SIZE) –2.0 –524288 –262144 0 262144 524288 OUTPUT CODE 237620 TA02 237620fb For more information www.linear.com/LTC2376-20 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 Typical Application Related Parts 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