Features

• 2x Speed Up Version of the LTC2410/LTC2413: 15Hz Output Rate, 50Hz or 60Hz Notch—LTC2415; 13.75Hz Output Rate, Simultaneous 5
• Differential Input and Differential Reference with GND to V_CC Common Mode Range
• 2ppm INL, No Missing Codes
• 2.5ppm Gain Error
• 0.23ppm Noise
• Single Conversion Settling Time for Multiplexed Applications
• Internal Oscillator—No External Components Required
• 24-Bit ADC in Narrow SSOP-16 Package (SO-8 Footprint)
• Single Supply 2.7V to 5.5V Operation
• Low Supply Current (200µA) and Auto Shutdown

Typical Application

Description

The LTC2415/LTC2415-1 are micropower 24-bit differential DeltaSigma analog to digital converters with integrated oscillator, 2ppm INL, 0.23ppm RMS noise and a 2.7V to 5.5V supply range. They use delta-sigma technology and provide single cycle settling time for multiplexed applications. Through a single pin, the LTC2415 can be configured for better than 110dB input differential mode rejection at 50Hz or 60Hz ±2%, or it can be driven by an external oscillator for a user defined rejection frequency. The LTC2415-1 can be configured for better than 87dB input differential mode rejection over the range of 49Hz to 61.2Hz (50Hz and 60Hz ±2% simultaneously). The internal oscillator requires no external frequency setting components.

The converters accept 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 –0.5V_REF to 0.5V_REF. The reference common mode voltage, V_REFCM, and the input common mode voltage, V_INCM, may be independently set anywhere within the GND to V_CC range of the LTC2415/LTC2415-1. The DC common mode input rejection is better than 140dB.

The LTC2415/LTC2415-1 communicate through a flexible 3-wire digital interface which is compatible with SPI and MICROWIRE™ protocols.