ADMV1455BBCZ-R7 datasheet(68/141 Pages) AD

68 / 141 page

Data Sheet

ADMV1455

THEORY OF OPERATION

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Rev. 0 | 68 of 141

Initialization SPI Instructions

Starting at tINITIALIZE (see Figure 167), configure the chip by using

the SPI instructions for its intended operation. Give all the neces-

sary SPI instructions to configure the chip, looping from tINITIALIZE

to the ready time, tREADY for each instruction. Keep the CEN

input low during the initialization SPI instructions, and complete the

initialization at tREADY.

Chip Enable and Operation

After all the initialization SPI instructions have been completed, wait

a minimum of t16 to ensure that the digital logic has processed the

instructions prior to setting the CEN input high at tOPERATIONAL to

enable chip operation. At tOPERATIONAL, the RF portions of the chip

are enabled. See Figure 168 for more information.

During chip operation, any necessary SPI instructions can be giv-

en, along with the LOAD input toggles, and any changes to the

ADD_Fx and ADD_Gx inputs. Continue operating, looping from

tOPERATIONAL to tCONTINUE until it is desired to either disable the chip,

reset the chip, or power down the chip.

Figure 168. Operational Timing Diagram

ADMV1455BBCZ-R7 Datenblatt(PDF) 68 Page - Analog Devices