AD9522-3 Analog Devices, Inc., AD9522-3 Datasheet - Page 49
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AD9522-3
Manufacturer Part Number
AD9522-3
Description
12 Lvds/24 Cmos Output Clock Generator With Integrated 2 Ghz Vco
Manufacturer
Analog Devices, Inc.
Datasheet
1.AD9522-3.pdf
(84 pages)
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PLL Power-Down
The PLL section of the AD9522 can be selectively powered
down. There are two PLL power-down modes set by
Register 0x010[1:0]: asynchronous and synchronous.
In asynchronous power-down mode, the device powers down as
soon as the registers are updated. In synchronous power-down
mode, the PLL power-down is gated by the charge pump to
prevent unwanted frequency jumps. The device goes into power-
down on the occurrence of the next charge pump event after the
registers are updated.
Distribution Power-Down
The distribution section can be powered down by writing
0x230[1] = 1b, which turns off the bias to the distribution
section. If the LVDS power-down mode is normal operation
(0b), it is possible for a low impedance load on that LVDS
output to draw significant current during this power-down. If
the LVDS power-down mode is set to 1b, the LVDS output is
not protected from reverse bias and can be damaged under
certain termination conditions.
Rev. 0 | Page 49 of 84
Individual Clock Output Power-Down
Any of the clock distribution outputs can be put
into power-down mode by individually writing to the
appropriate registers. The register map details the individual
power-down settings for each output. These settings are found
in Register 0x0F0[0] to Register 0x0FB[0].
Individual Clock Channel Power-Down
Any of the clock distribution channels can be powered down
individually by writing to the appropriate registers. Powering
down a clock channel is similar to powering down an individual
driver, but it saves more power because the dividers are also
powered down. Powering down a clock channel also automatically
powers down the drivers connected to it. The register map
details the individual power-down settings for each output
channel. These settings are found in 0x192[2], 0x195[2],
0x198[2], and 0x19B[2].
AD9522-3