Features

• 2-Channel Differential Input with Automatic Channel Selection (Ping-Pong)
• Low Supply Current: 200µA, 4µA in Autosleep
• Differential Input and Differential Reference with GND to V_CC Common Mode Range
• 0.12LSB INL, No Missing Codes
• 0.16LSB Full-Scale Error and 0.006LSB Offset
• 800nV RMS Noise, Independent of V_REF
• No Latency: Digital Filter Settles in a Single Cycle and Each Channel Conversion is Accurate
• Internal Oscillator—No External Components Required
• 87dB Min, 50Hz and 60Hz Notch Filter
• Narrow SSOP-16 Package
• Single Supply 2.7V to 5.5V Operation
• Pin Compatible with the 24-Bit LTC2412

Typical Application

Description

The LTC®2436-1 is a 2-channel differential input micropower 16-bit No Latency Delta Sigma™ analog-to-digital converter with an integrated oscillator. It provides 0.5LSB INL and 800nV RMS noise independent of V_REF. The two differential channels convert alternately with a channel identification included in the conversion result. It uses delta-sigma technology and provides single conversion settling of the digital filter. Through a single pin, the LTC2436-1 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 full-scale 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 LTC2436-1 communicates through a flexible 3-wire digital interface which is compatible with SPI and MICROWIRE™ protocols.