LTC2378-20 20-Bit, 1Msps, Low Power SAR ADC with 0.5ppm INL Fea T Descrip T n 1Msps Throughput Rate The LTC 2378-20 is a low noise, low power, high speed n 0.5ppm INL (Typ) 20-bit successive approximation register (SAR) ADC. n Guaranteed 20-Bit No Missing Codes Operating from a 2.5V supply, the LTC2378-20 has a n Low Power: 21mW at 1Msps, 21W at 1ksps V fully differential input range with V ranging from REF REF n 104dB SNR (Typ) at f = 2kHz 2.5V to 5.1V. The LTC2378-20 consumes only 21mW and IN n 125dB THD (Typ) at f = 2kHz achieves 2ppm INL maximum, no missing codes at 20 IN n Digital Gain Compression (DGC) bits with 104dB SNR. n Guaranteed Operation to 85C The LTC2378-20 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 V REF while also featuring a daisy-chain mode. The fast 1Msps n V Input Range from 2.5V to 5.1V REF throughput with no cycle latency makes the LTC2378-20 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 LTC2378-20 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 LTC2378-20 features a unique digital gain compres- a T sion (DGC) function, which eliminates the driver amplifiers 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 V REF n Industrial Process Control and full-scale code from V to 0.9 V . For a typical REF REF 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 a T Integral Nonlinearity vs Output Code 2.0 2.5V 1.8V TO 5V 1.5 10F 0.1F 1.0 V OV CHAIN DD DD V 6800pF 0.5 REF 10 + RDL/SDI + IN SDO 0 0V 3300pF LTC2378-20 SCK V REF BUSY 0.5 IN CNV SAMPLE CLOCK 0V 10 6800pF REF REF/DGC V REF GND REF 1.0 2.5V TO 5.1V 237820 TA01a 1.5 47F 2.0 (X7R, 1210 SIZE) 524288 262144 0 262144 524288 OUTPUT CODE 237820 TA01b 237820fb 1 For more information www.linear.com/LTC2378-20 INL ERROR (ppm) ion pplica ions pplica ion uresLTC2378-20 a Te Maxi Mu M r a T (Notes 1, 2) Supply Voltage (V ) ...............................................2.8V Digital Output Voltage DD Supply Voltage (OV ) ................................................6V (Note 3) ........................... (GND 0.3V) to (OV + 0.3V) DD DD Reference Input (REF) .................................................6V Power Dissipation .............................................. 500mW Analog Input Voltage (Note 3) Operating Temperature Range + IN , IN ......................... (GND 0.3V) to (REF + 0.3V) LTC2378C ................................................ 0C to 70C REF/DGC Input (Note 3) .... (GND 0.3V) to (REF + 0.3V) LTC2378I .............................................40C to 85C Digital Input Voltage Storage Temperature Range .................. 65C to 150C (Note 3) ........................... (GND 0.3V) to (OV + 0.3V) DD p c F T TOP VIEW CHAIN 1 16 GND TOP VIEW V 2 15 OV DD DD CHAIN 1 16 GND GND 3 14 SDO V 2 15 OV DD DD + GND 3 14 SDO IN 4 17 13 SCK + IN 4 13 SCK GND IN 5 12 RDL/SDI IN 5 12 RDL/SDI GND 6 11 BUSY GND 6 11 BUSY REF 7 10 GND REF 7 10 GND REF/DGC 8 9 CNV REF/DGC 8 9 CNV MS PACKAGE 16-LEAD PLASTIC MSOP DE PACKAGE T = 150C, = 110C/W 16-LEAD (4mm 3mm) PLASTIC DFN JMAX JA T = 150C, = 40C/W JMAX JA EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB o r D i n F Ma T