Datasheet LTC2444, LTC2445, LTC2448, LTC2449 (Analog Devices) - 7

LTC2444/LTC2445/ LTC2448/LTC2449
pin FuncTions CS (Pin 36):
Active Low Chip Select. A LOW on this pin
SCK (Pin 38):
Bidirectional Digital Clock Pin. In internal enables the SDO digital output and wakes up the ADC. serial clock operation mode, SCK is used as a digital Following each conversion the ADC automatically enters output for the internal serial interface clock during the the sleep mode and remains in this low power state as data output period. In the external serial clock operation long as CS is HIGH. A LOW-to-HIGH transition on CS dur- mode, SCK is used as the digital input for the external ing the Data Output aborts the data transfer and starts a serial interface clock during the data output period. The new conversion. serial clock operation mode is determined by the logic
SDO (Pin 37):
Three-State Digital Output. During the data level applied to the EXT pin. output period, this pin is used as serial data output. When
Exposed Pad (Pin 39):
Ground. The exposed pad on the the chip select CS is HIGH (CS = VCC) the SDO pin is in bottom of the package must be soldered to the PCB ground. a high impedance state. During the conversion and sleep For prototyping purposes, this pin may remain floating. periods, this pin is used as the conversion status output. The conversion status can be observed by pulling CS LOW. This signal is HIGH while the conversion is in progress and goes LOW once the conversion is complete. 2444589fc For more information www.linear.com/LTC2444 7 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Analog Input and Reference Digital Inputs and Digital Outputs Power Requirements Timing Characteristics Pin Functions Functional Block Diagram Test Circuit Applications Information Package Description Revision History Typical Application Related Parts