ADI LTC2378IMS-20#PBF

The LTC2378-20 is a low noise, low power, high speed 20-bit successive approximation register (SAR) ADC. Operating from a 2.5V supply, the LTC2378-20 has a ±VREF fully differential input range with VREF ranging from 2.5V to 5.1V. The LTC2378-20 consumes only 21mW and achieves ±2ppm INL maximum, no missing codes at 20 bits with 104dB SNR. The LTC2378-20 has a high speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisy-chain mode. The fast 1Msps throughput with no cycle latency makes the LTC2378-20 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2378-20 automatically powers down between conversions, leading to reduced power dissipation that scales with the sampling rate. The LTC2378-20 features a unique digital gain compression (DGC) function, which eliminates the driver amplifier’s negative supply while preserving the full resolution of the ADC. When enabled, the ADC performs a digital scaling function that maps zero-scale code from 0V to 0.1·VREF and full-scale code from VREF to 0.9·VREF. For a typical reference voltage of 5V, the full-scale input range is now 0.5V to 4.5V, which provides adequate headroom for powering the driving amplifier from a single 5.5V supply.

• 1Msps Throughput Rate
• ±0.5ppm INL (Typ)
• Guaranteed 20-Bit No Missing Codes
• Low Power: 21mW at 1Msps, 21µW at 1ksps
• 104dB SNR (Typ) at fIN = 2kHz
• –125dB THD (Typ) at fIN = 2kHz
• Digital Gain Compression (DGC)
• Guaranteed Operation to 85°C
• 2.5V Supply
• Fully Differential Input Range ±VREF
• VREF Input Range from 2.5V to 5.1V
• No Pipeline Delay, No Cycle Latency
• 1.8V to 5V I/O Voltages
• SPI-Compatible Serial I/O with Daisy-Chain Mode
• Internal Conversion Clock
• 16-Lead MSOP and 4mm × 3mm DFN Packages

• Medical Imaging
• High Speed Data Acquisition
• Portable or Compact Instrumentation
• Industrial Process Control
• Low Power Battery-Operated Instrumentation
• ATE