AD9929BBCZ datasheet(56/64 Pages) AD

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AD9929

Rev. A | Page 56 of 64

STANDBY MODE OPERATION

Recommended Standby Mode Sequence

When the AD9929 is going into standby operation, the follow-

ing sequence is recommended (refer to Figure 67 for each step).

Program OUTCONT_REG (Address 0x05) = 0. This

asserts the internal OUTCONT signal low, causing all

digital outputs to become disabled.

Program registers AFESTBY (Address 0x05) = 0 and

DIGSTBY (Address 0x05) = 0. The AD9929 is now in

standby operation.

When ready to come out of standby operation, program

AFESTBY (Address 0x05) = 1.

Program necessary control registers.

Program control register MODE (Address 0x0A) = 0. This

selects Mode_A operation.

Program register OUTCONT_REG (Address 0x05) = 1.

This asserts the internal OUTCONT signal high, causing

all digital outputs to become active.

SERIAL

WRITES

(OUTPUT)

DIGITAL

OUTPUTS

H2, RG, MSHUT, STROBE, FD

H1, VSUB

CLI

(INPUT)

(OUTPUT)

OUTCONT

(INTERNAL SIGNAL)

AFESTBY

(REGISTER)

DIGSTBY

(REGISTER)

DCLK1

AND

DCLK21

NOTES

1DCLK2 WILL BE OUTPUT ON THE FD/DCLK2 PIN 16 PROVIDING REGISTER DCLK2SEL (ADDRESS 0xD5) = 1.

2IT TAKES 11 CLI CLOCKS FROM WHEN OCONT GOES HIGH UNTIL VD, HD, AND DIGITAL OUTPUT DATA IS VALID.

AD9929

SUPPLIES

tDELAY2

Figure 67. Recommended Standby Sequence

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