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AD9271

Preliminary Technical Data

Rev. PrA | Page 36 of 58

This interface is flexible enough to be controlled by either serial

PROMS or PIC mirocontrollers. This provides the user an

alternative method, other than a full SPI controller, to program

the ADC (see the AN-812 Application Note).

If the user chooses not to use the SPI interface, these pins serve

a dual function and are associated with secondary functions

when the CSB is strapped to AVDD during device power-up.

See the section for details on which pin-strappable functions are

supported on the SPI pins.

DON’T CARE

SDIO

SCLK

CSB

tDH

tHI

tCLK

tLO

tDS

R/W

A12

A11

A10

Figure 63. Serial Timing Details

Table 15. Serial Timing Definitions

Parameter

Minimum Timing (ns)

Description

tDS

Setup time between the data and the rising edge of SCLK

tDH

Hold time between the data and the rising edge of SCLK

tCLK

Period of the clock

Setup time between CSB and SCLK

Hold time between CSB and SCLK

tHI

Minimum period that SCLK should be in a logic high state

tLO

Minimum period that SCLK should be in a logic low state

tEN_SDIO

Minimum time for the SDIO pin to switch from an input to an output relative to the

SCLK falling edge (not shown in Figure 63).

tDIS_SDIO

Minimum time for the SDIO pin to switch from an output to an input relative to the

SCLK rising edge (not shown in Figure 63).

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