LTC2381-16 16-Bit, 250ksps, Low Power SAR ADC with Serial Interface FEATURES DESCRIPTION n 250ksps Throughput Rate The LTC 2381-16 is a low noise, low power, high speed n 2LSB INL (Max) 16-bit successive approximation register (SAR) ADC. n Guaranteed 16-Bit No Missing Codes Operating from a 2.5V supply, the LTC2381-16 has a n Low Power: 3.25mW at 250ksps, 13W at 1ksps 2.5V fully differential input range. The LTC2381-16 n 92dB SNR (Typ) at f = 20kHz consumes only 3.25mW and achieves 2LSB INL max, IN n Extended Acquisition Time of 3.25s Allows Use of no missing codes at 16-bits and 92dB SNR. Lower Power Drivers The LTC2381-16 has a high speed SPI-compatible serial n Guaranteed Operation to 125C interface that supports 1.8V, 2.5V, 3.3V and 5V logic n 2.5V Supply while also featuring a daisy-chain mode. The fast 250ksps n Fully Differential Input Range 2.5V throughput with no cycle latency makes the LTC2381-16 n External 2.5V Reference Input ideally suited for a wide variety of high speed applications. n No Pipeline Delay, No Cycle Latency An internal oscillator sets the conversion time, easing exter- n 1.8V to 5V I/O Voltages nal timing considerations. The LTC2381-16 automatically n SPI-Compatible Serial I/O with Daisy-Chain Mode powers down between conversions, leading to reduced n Internal Conversion Clock power dissipation that scales with the sampling rate. n 16-Pin MSOP and 4mm 3mm DFN Packages The LTC2381-16 features a proprietary sampling archi- APPLICATIONS tecture that enables the ADC to begin acquiring the next sample during the current conversion. The resulting n Medical Imaging extended acquisition time of 3.25s allows the use of n High Speed Data Acquisition extremely low power ADC drivers. n Portable or Compact Instrumentation n Industrial Process Control L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Low Power Battery-Operated Instrumentation Technology Corporation. All other trademarks are the property of their respective owners. n ATE TYPICAL APPLICATION 32k Point FFT f = 250ksps, f = 20kHz S IN 0 2.5V 1.8V TO 5V SNR = 91.8dB THD = 106dB 20 10F 0.1F SINAD = 91.6dB ANALOG INPUT 40 SFDR = 107dB 0V TO 2.5V 60 V OV 50 100 CHAIN DD DD + IN RDL/SDI 80 SDO LT6350 LTC2381-16 3300pF SCK 100 BUSY IN SAMPLE CLOCK 120 50 100 CNV REF GND 238116 TA01 140 2.5V SINGLE-ENDED- TO-DIFFERENTIAL 47F 160 DRIVER (X5R, 0805 SIZE) 180 0 25 50 75 100 125 FREQUENCY (kHz) 238116 TA02a 238116fa 1 For more information www.linear.com/LTC2381-16 AMPLITUDE (dBFS)LTC2381-16 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Digital Output Voltage Supply Voltage (V ) ...............................................2.8V DD (Note 3) ........................... (GND 0.3V) to (OV + 0.3V) DD Supply Voltage (OV ) ................................................6V DD Power Dissipation .............................................. 500mW Reference Input (REF) ..............................................2.8V Operating Temperature Range Analog Input Voltage (Note 3) LTC2381C ................................................ 0C to 70C + IN , IN ......................... (GND 0.3V) to (REF + 0.3V) LTC2381I .............................................40C to 85C Digital Input Voltage LTC2381H .......................................... 40C to 125C (Note 3) ........................... (GND 0.3V) to (OV + 0.3V) DD Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION 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 8 9 CNV REF 8 9 CNV MS PACKAGE 16-LEAD (4mm 5mm) PLASTIC MSOP DE PACKAGE 16-LEAD (4mm 3mm) PLASTIC DFN T = 150C, = 110C/W JMAX JA T = 150C, = 43C/W JMAX JA EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB