AD9520-0 Analog Devices, Inc., AD9520-0 Datasheet - Page 79

• Manufacturer Part Number: AD9520-0
• Description: 12 Lvpecl/24 Cmos Output Clock Generator With Integrated 2.8 Ghz Vco
• Manufacturer: Analog Devices, Inc.

Reg.
Addr
(Hex) Bit(s) Name
19B
19B
Reg.
Addr
(Hex) Bit(s) Name
1E0
1E1
1E1
1E1
1E1
1E1
Table 56. VCO Divider and CLK Input
[2:0]
[4]
[3]
[2]
[1]
[0]
[1]
[0]
VCO divider
Power-down clock input section Powers down the clock input section (including CLK buffer, VCO divider, and CLK tree).
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
Channel 3 direct-to-output
Disable Divider 3 DCC
Description
Connects OUT9, OUT10, and OUT11 to Divider 3 or directly to VCO or CLK.
[1] = 0; OUT9, OUT10, and OUT11 are connected to Divider 3 (default).
[1] = 1;
If 0x1E1[1:0] = 10b, the VCO is routed directly to OUT9, OUT10, and OUT11.
If 0x1E1[1:0] = 00b, the CLK is routed directly to OUT9, OUT10, and OUT11.
If 0x1E1[1:0] = 01b, there is no effect.
Duty-cycle correction function.
[0] = 0; enable duty-cycle correction (default).
[0] = 1; disable duty-cycle correction.
Description
[2]
0
0
0
0
1
1
1
1
[4] = 0; normal operation (default).
[4] = 1; power down.
[3] = 0; normal operation (default).
[3] = 1; power down.
Powers down both VCO and CLK input.
[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.
Rev. 0 | Page 79 of 84
[1]
0
0
1
1
0
0
1
1
[0]
0
1
0
1
0
1
0
1
Divide
2 (default)
3
4
5
6
Output static
1 (bypass)
Output static
AD9520-0