20-Bit 1Msps SAR ADC 0.5ppm INL IN+ 0V 2.5V Integral Nonlinearity vs Output Code OVDD 1.8V to 5V VDD VREF SPI I/O Up to 5V IN– 2.0 1.5 1.0 INL Error (PPM) 2.5V to 5V Up to 5V 0.5 0.0 –0.5 –1.0 GND –1.5 –2.0 0V 0 262144 524288 786432 1048576 Output Code No Latency SAR ADC Achieves 104dB SNR ® The LTC 2378-20 SAR ADC achieves 20 bits of resolution with outstanding 0.5ppm INL and 104dB SNR performance with no cycle latency and sample rates up to 1Msps. It offers uncompromised performance, low power dissipation and excellent temperature stability for high precision signal chains. The LTC2378-20 family includes pin-compatible 20-/18-/16-bit SAR ADCs from 250ksps up to 2Msps with serial SPI interface and explicit Busy and Chain pins that simplify digital timing. Features Complete 20-/18-/16-Bit Pin-Compatible SAR ADC Family •1Msps Throughput Rate 250ksps 500ksps 1Msps 20-Bit 104dB SNR 2376-20 2377-20 2378-20 18-Bit 101dB SNR 2376-18 2377-18 2378-18 16-Bit 96dB SNR 2376-16 2377-16 2378-16 •±0.5ppm INL (Typ), ±2ppm INL (Max) •104dB SNR (Typ) at fIN = 2kHz •–125dB THD (Typ) at fIN = 2kHz •Low Power: 21mW at 1Msps, 21μW at 1ksps •Fully Differential Input Range ±VREF •VREF Input Range from 2.5V to 5.1V •Digital Gain Compression Eliminates Need for Negative Rails •–40°C to +85°C Guaranteed Temperature Range •16-pin MSOP and 4mm x 3mm DFN Packages , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1.6Msps 2Msps 2379-18 2380-16 Info & Free Samples 1-800-4-LINEAR www.linear.com/LTC2378-20