Datasheet

AD9953
Rev. A | Page 28 of 32
When the CFR1<3> bit is 0 and the PWRDWNCTL input pin is
high, the AD9953 is put into a fast recovery power-down mode.
In this mode, the digital logic and the DAC digital logic are
powered down. The DAC bias circuitry, PLL, oscillator, and
clock input circuitry is not powered down.
When the CFR1<3> bit is high, and the PWRDWNCTL input
pin is high, the AD9953 is put into the full power-down mode.
In this mode, all functions are powered down. This includes the
DAC and PLL, which take a significant amount of time to
power up.
When the PWRDWNCTL input pin is high, the individual
power-down bits (CFR1<7>, <5:4>) are invalid (Don’t Care)
and unused. When the PWRDWNCTL input pin is low, the
individual power-down bits control the power-down modes of
operation.
Note that the power-down signals are all designed such that a
Logic 1 indicates the low power mode and a Logic 0 indicates
the active or power-up mode.
Table 10 indicates the logic level for each power-down bit that
drives out of the AD9953 core logic to the analog section and
the digital clock generation section of the chip for the external
power-down operation.
Layout Considerations
For the best performance, the following layout guidelines
should be observed. Always provide the analog power supply
(AVDD) and the digital power supply (DVDD) on separate
supplies, even if just from two different voltage regulators
driven by a common supply. Likewise, the ground connections
(AGND, DGND) should be kept separate as far back to the
source as possible (i.e., separate the ground planes on a
localized board even if the grounds connect to a common point
in the system). Bypass capacitors should be placed as close to
the device pin as possible. Usually a multitiered bypassing
scheme consisting of a small high frequency capacitor (100 pF)
placed close to the supply pin and progressively larger capaci-
tors (0.1 μF, 10 μF) placed further away from the actual supply
source works best.
Table 10. Power-Down Control Functions
Control Mode Active Description
PWRDWNCTL = 0 CFR1<3> Don’t Care Software Control Digital Power-Down = CFR1<7>
DAC Power-Down = CFR1<5>
Input Clock Power-Down = CFR1<4>
PWRDWNCTL = 1 CFR1<3> = 0
External Control,
Fast Recovery Power-Down Mode
Digital Power-Down = 1’b1
DAC Power-Down = 1’b0
Input Clock Power-Down = 1’b0
PWRDWNCTL = 1 CFR1<3> = 1
External Control,
Full Power-Down Mode
Digital Power-Down = 1’b1
DAC Power-Down = 1’b1
Input Clock Power-Down = 1’b1