Features

• 16-Bit Differential ADC in a Tiny MSOP
• Low Supply Current: 200µA, 4µA in Autosleep
• Rail-to-Rail Differential Input/Reference
• 0.12LSB INL, No Missing Codes
• 0.16LSB Full-Scale Error and 5µV Offset
• 1.45µV RMS Noise, Independent of V_REF
• Very Low Transition Noise: <0.02LSB
• Operates with a Reference as Low as 100mV with 16-Bit Resolution
• Internal Oscillator—No External Components Required
• 87dB Min, Simultaneous 50Hz and 60Hz Notch Filter
• Single Supply 2.7V to 5.5V Operation
• Pin Compatible with the 20/24-Bit LTC2431/LTC2411
• Available in 10-Lead MSOP Package

Typical Application

Description

The LTC2433-1 is a differential input micropower 16-bit No Latency Delta Sigma analog-to-digital converter with an integrated oscillator. It provides 0.12LSB INL and 1.45µV RMS noise independent of V_REF. It uses delta-sigma technology and provides single conversion settling of the digital filter. Through a single pin, the LTC2433-1 can be configured for better than 87dB input differential mode rejection at 50Hz and 60Hz ±2%, or it can be driven by an external oscillator for a user defined rejection frequency. The internal oscillator requires no external frequency setting components.

The converter accepts any external differential reference voltage from 0.1V to V_CC for flexible ratiometric and remote sensing measurement configurations. The fullscale differential input range is from – 0.5 • V_REF to 0.5 • V_REF. The reference common mode voltage, V_REFCM, and the input common mode voltage, V_INCM, may be independently set anywhere between GND and V_CC. The DC common mode input rejection is better than 140dB.

The LTC2433-1 communicates through a flexible 3-wire digital interface which is compatible with SPI and MICROWIRE protocols.