Datasheet AD7298 (Analog Devices) - 9

AD7298 Pin No. Mnemonic Description
16 VDRIVE Logic Power Supply Input. The voltage supplied at this pin determines at the voltage at which the interface operates. This pin should be decoupled to GND. The voltage range on this pin is 1.65 V to 3.6 V and may be less than the voltage at VDD, but should never exceed it by more than 0.3 V. 17 PD/RST Power-Down Pin. This pin places the part into full power-down mode and enables power conservation when operation is not required. This pin can be used to reset the device by toggling the pin low for a minimum of 1 ns and a maximum of 100 ns. If the maximum time is exceeded, the part enters power-down mode. When placing the AD7298 in full power-down mode, the analog inputs must return to 0 V. EPAD EPAD The exposed metal paddle on the bottom of the LFCSP package should be soldered to PCB ground for proper functionality and heat dissipation. Rev. B | Page 8 of 24 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION THERMAL RESISTANCE PIN CONFIGURATION AND FUNCTION DESCRIPTION TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT ADC Transfer Function TEMPERATURE SENSOR OPERATION TEMPERATURE SENSOR AVERAGING Temperature Value Format VDRIVE THE INTERNAL OR EXTERNAL REFERENCE CONTROL REGISTER MODES OF OPERATION TRADITIONAL MULTICHANNEL MODE OF OPERATION REPEAT OPERATION POWER-DOWN MODES Normal Mode Partial Power-Down Mode Full Power-Down Mode POWERING UP THE AD7298 RESET SERIAL INTERFACE TEMPERATURE SENSOR READ LAYOUT AND CONFIGURATION POWER SUPPLY BYPASSING AND GROUNDING TEMPERATURE MONITORING OUTLINE DIMENSIONS ORDERING GUIDE