AD9267EBZ datasheet(21/25 Pages) AD

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AD9267

Rev. 0 | Page 20 of 24

HARDWARE INTERFACE

The pins described in Table 13 comprise the physical interface

between the programming device of the user and the serial port

of the AD9267. The SCLK and CSB pins function as inputs

when using the SPI interface. The SDIO pin is bidirectional,

functioning as an input during write phases and as an output

during readback.

The SPI interface is flexible enough to be controlled by either

PROM or PIC microcontrollers. This provides the user with the

ability to use an alternate method to program the ADC. One

such method is described in detail in the AN-812 Application

Note, MicroController-Based Serial Port Interface (SPI) Boot

Circuit.

When the SPI interface is not used, SCLK/PLLMULT0 and

SDIO/PLLMULT1 serve a dual function. When strapped to

AVDD or ground during device power-on, the pins are

associated with a specific function.

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