A recommended replacement for the LTC2444 is the LTC2448. When replaced with LTC2448, multiple pins such as pins 8, 11, 12, 15, 16, 19, 20 and 23 will be left floating. These pins may be left floating without affecting the performance of the ADC. Just take note that the channel number assignments are different between from the LTC2444 but these can be adjusted through the software.