AD9913 datasheet(21/32 Pages) AD

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AD9913

Rev. 0 | Page 21 of 32

POWER-DOWN FEATURES

The AD9913 supports an externally controlled power-down

feature as well as software programmable power-down bits

consistent with other Analog Devices, Inc. DDS products.

The external PWR_DWN_CTL pin determines the power-

down scheme. A low on this pin allows the user to power down

DAC, PLL, input clock circuitry, and the digital section of the

chip individually via the unique control bits, CFR1 [6:4]. In this

mode, CFR1 [7] is inactive.

When the PWR_DWN_CTL is set, CFR1 [6:4] lose their

meaning. At the same time, the AD9913 provides two different

power-down modes based on the value of CFR1 [7]: a fast

recovery power-down mode in which only the digital logic and

the DAC digital logic are powered down, and a full power-down

mode in which all functions are powered down. A significant

amount of time is required to recover from power-down mode.

Table 11 indicates the logic level for each power-down bit that

drives out of the AD9913 core logic to the analog section and

the digital clock generation section of the chip for the external

power-down operation.

Table 8. Power-Down Controls

Control

Mode Active

Description

PWR_DWN_CTL = 0

CFR1 [7] = don’t

care

Software

Control

Digital power-down = CFR1 [6]

DAC power-down = CFR1 [5]

Input clock power-down =

CFR1 [4]

PWRDWNCTL = 1

CFR1 [7] = 0

External

Control,

Fast recovery

power-down

mode

N/A

PWRDWNCTL = 1

CFR1 [7] = 1

External

Control,

Full power-

down mode

N/A

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