Datasheet AD7366, AD7367 (Analog Devices) - 10

AD7366/AD7367 Pin No. Mnemonic Description
18 REFSEL Internal/External Reference Selection, Logic Input. If this pin is tied to logic high, the on-chip 2.5 V reference is used as the reference source for both ADC A and ADC B. In addition, Pin D A and Pin D B must be tied to CAP CAP decoupling capacitors. If the REFSEL pin is tied to GND, an external reference can be supplied to the AD7366/ AD7367 through the D A pin, the D B pin, or both pins. CAP CAP 19 CS Chip Select, Active Low Logic Input. This input frames the serial data transfer. When CS is logic low, the output bus is enabled and the conversion result is output on D A and D B. OUT OUT 20 SCLK Serial Clock, Logic Input. A serial clock input provides the SCLK for accessing the data from the AD7366/AD7367. 21 CNVST Conversion Start, Logic Input. This pin is edge triggered. On the falling edge of this input, the track/hold goes into hold mode and the conversion is initiated. If CNVST is low at the end of a conversion, the part goes into power-down mode. In this case, the rising edge of CNVST instructs the part to power up again. 22 BUSY Busy Output. BUSY transitions high when a conversion is started and remains high until the conversion is complete. 24 DGND Digital Ground. Ground reference point for all digital circuitry on the AD7366/AD7367. The DGND pin should connect to the DGND plane of a system. The DGND and AGND voltages should ideally be at the same potential and must not be more than 0.3 V apart, even on a transient basis. Rev. D | Page 10 of 28 Document Outline Features Functional Block Diagram General Description Product Highlights Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Circuit Information Converter Operation Analog Inputs Transfer Function Track-and-Hold Typical Connection Diagram Driver Amplifier Choice VDRIVE Reference Modes of Operation Normal Mode Shutdown Mode Power-Up Times Serial Interface Microprocessor Interfacing AD7366/AD7367 to ADSP-218x AD7366/AD7367 to ADSP-BF53x AD7366/AD7367 to TMS320VC5506 AD7366/AD7367 to DSP563xx Application Hints Layout and Grounding Outline Dimensions Ordering Guide