AD9553SLASHPCBZ datasheet(17/44 Pages) AD

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AD9553

Rev. 0 | Page 17 of 44

DEVICE CONTROL MODES

The AD9553 provides two modes of control: pin control and

(A[3:0] and Y[5:0]) as described in the Preset Frequencies

section, is the simplest. Typically, pin control is for applications

requiring only a single set of operating parameters (assuming

that one of the options available via the frequency selection

pins provides the parameters that satisfy the application

requirements). Register control is typically for applications that

require the flexibility to program different operating parameters

from time to time, or for applications that require parameters

not available with any of the pin control options. The block

diagram (see Figure 19) shows how the SPI and pin control

modes interact.

The SPI/OM[2:0] label in Figure 19 refers to Pin 12, Pin 13 ,and

Pin 14 of the AD9553. Furthermore, the SPI mode signal is

Logic 1 when A[3:0] = 0000 and/or Y[5:0] = 000000; otherwise,

it is Logic 0.

A[3:0]

SPI/OM[2:0]

FUNCTION

ABC BITS

FUNCTION

XYZ BITS

ENABLE SPI CONTROL

OF OUTPUT MODE

ENABLE SPI CONTROL

OF OUTPUT ABC BITS

ENABLE SPI CONTROL

OF FUNCTIONING XYZ

OUTPUT

MODE

CONTROL

FUNCTION

BITS

FUNCTION

MUXES

Y[5:0]

FREQUENCY

SELECTION

PINS DECODER

SPI MODE

SPI CONTROLLER

OUTPUT

MODE

CONTROL

DECODER

OUTPUT MODE

CONTROL

FUNCTION

ABC

FUNCTION

XYZ

Figure 19. Control Mode Diagram

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