AD9522-2 Analog Devices, Inc., AD9522-2 Datasheet - Page 78
AD9522-2
Manufacturer Part Number
AD9522-2
Description
12 Lvds/24 Cmos Output Clock Generator With Integrated 2.2 Ghz Vco
Manufacturer
Analog Devices, Inc.
Datasheet
1.AD9522-2.pdf
(84 pages)
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Reg.
Addr
(Hex) Bit(s) Name
1E1
1E1
1E1
1E1
AD9522-2
Table 56. System
Reg.
Addr
(Hex) Bit(s) Name
230
230
230
230
Table 57. Update All Registers
Reg.
Addr
(Hex) Bit(s) Name
232
[3]
[2]
[1]
[0]
[0]
[3]
[2]
[1]
[0]
Power-down VCO clock interface Powers down the interface block between VCO and clock distribution.
Power-down VCO and CLK
Select VCO or CLK
Bypass VCO divider
IO_UPDATE
Disable power-on SYNC
Power-down SYNC
Power-down distribution reference
Soft SYNC
This bit must be set to 1 to transfer the contents of the buffer registers into the active registers. This happens
on the next SCLK rising edge. This bit is self-clearing; that is, it does not have to be set back to 0.
[0] = 1 (self-clearing); update all active registers to the contents of the buffer registers.
Description
Description
[3] = 0; normal operation (default).
[3] = 1; power down.
Powers down both the CLK input and VCO.
[2] = 0; normal operation (default).
[2] = 1; power down.
Selects either the VCO or the CLK as the input to VCO divider.
[1] = 0; select external CLK as input to VCO divider (default).
[1] = 1; select VCO as input to VCO divider; cannot bypass VCO divider when this is selected.
This bit must be set to use the PLL with the internal VCO.
Bypasses or uses the VCO divider.
[0] = 0; use VCO divider (default).
[0] = 1; bypass VCO divider; cannot select VCO as input when this is selected.
Description
Power-on SYNC mode. Used to disable the antiruntpulse circuitry.
[3] = 0; enable the antiruntpulse circuitry (default).
[3] = 1; disable the antiruntpulse circuitry.
Powers down the SYNC function.
[2] = 0; normal operation of the SYNC function (default).
[2] = 1; power-down SYNC circuitry.
Powers down the reference for the distribution section.
[1] = 0; normal operation of the reference for the distribution section (default).
[1] = 1; powers down the reference for the distribution section.
The soft SYNC bit works the same as the SYNC pin, except that the polarity of the bit
is reversed; that is, a high level forces selected channels into a predetermined static
state, and a 1-to-0 transition triggers a SYNC.
[0] = 0; same as SYNC high.
[0] = 1; same as SYNC low.
Rev. 0 | Page 78 of 84
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