Datasheet

AD9518-4 Data Sheet
Rev. B | Page 54 of 64
Reg.
Addr.
(Hex)
Bits Name Description
1 REF1 frequency >
threshold
Read-only register. Indicates if the frequency of the signal at REF2 is greater than the threshold frequency
set by Register 0x01A, Bit 6.
0: REF1 frequency is less than threshold frequency.
1: REF1 frequency is greater than threshold frequency.
0 Digital lock detect Read-only register. Digital lock detect.
0: PLL is not locked.
1: PLL is locked.
Table 45. LVPECL Outputs
Reg.
Addr.
(Hex) Bits Name Description
0x0F0 4 OUT0 invert Sets the output polarity.
0: noninverting (default).
1: inverting.
[3:2] Sets the LVPECL output differential voltage (V
OD
).
3 2 V
OD
(mV)
OUT0 LVPECL
differential voltage
0 0 400.
0 1 600.
1 0 780 (default).
1 1 960.
[1:0] OUT0 power-down LVPECL power-down modes.
1 0 Mode Output
0 0 Normal operation (default). On
0 1 Partial power-down, reference on; use only if there are no external load resistors. Off
1 0 Partial power-down, reference on, safe LVPECL power-down. Off
1 1 Total power-down, reference off; use only if there are no external load resistors. Off
0x0F1 4 OUT1 invert Sets the output polarity.
0: noninverting (default).
1: inverting.
[3:2] Sets the LVPECL output differential voltage (V
OD
).
3 2 V
OD
(mV)
OUT1 LVPECL
differential
voltage
0 0 400.
0 1 600.
1 0 780 (default).
1 1 960.
[1:0] OUT1 power-down LVPECL power-down modes.
1 0 Mode Output
0 0 Normal operation. On
0 1 Partial power-down, reference on; use only if there are no external load resistors. Off
1 0 Partial power-down, reference on, safe LVPECL power-down (default). Off
1 1 Total power-down, reference off; use only if there are no external load resistors. Off
0x0F2 4 OUT2 invert Sets the output polarity.
0: noninverting (default).
1: inverting.
[3:2] Sets the LVPECL output differential voltage (V
OD
).
3 2 V
OD
(mV)
OUT2 LVPECL
differential
voltage
0 0 400.
0 1 600.
1 0 780 (default).
1 1 960.
[1:0] OUT2 power-down LVPECL power-down modes.
1 0 Mode Output
0 0 Normal operation (default). On
0 1 Partial power-down, reference on; use only if there are no external load resistors. Off
1 0 Partial power-down, reference on, safe LVPECL power-down. Off
1 1 Total power-down, reference off; use only if there are no external load resistors. Off