SI5327 Datasheet, PDF (47/60 Pages) Silicon Laboratories – ANY-FREQUENCY PRECISION CLOCK MULTIPLIER/JITTER ATTENUATOR

Si5327
Register 137.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
FASTLOCK
Type
R
R
R
R
R
R
R
R/W
Reset value = 0000 0000
Bit
Name
Function
7:1
Reserved
Do not modify.
0
FASTLOCK This bit must be set to 1 to enable FASTLOCK. This improves initial lock time by
dynamically changing the loop bandwidth.
Register 138.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
LOS2_EN LOS1_EN
Type
R
R
R
R
R
R
R/W
R/W
Reset value = 0000 1111
Bit
Name
Function
7:2
Reserved
1
LOS2_EN Enable CKIN2 LOS Monitoring on the Specified Input (2 of 2).
Note: LOS2_EN is split between two registers.
00: Disable LOS monitoring
01: Reserved
10: Enable LOSA monitoring
11: Enable LOS monitoring
LOSA is a slower and less sensitive version of LOS. SEe the Si53xx Family Reference
Manual for details.
0
LOS1_EN Enable CKIN1 LOS Monitoring on the Specified Input (1 of 2).
Note: LOS1_EN is split between two registers.
00: Disable LOS monitoring
01: Reserved
10: Enable LOSA monitoring
11: Enable LOS monitoring
LOSA is a slower and less sensitive version of LOS. See the Si53xx Family Reference
Manual for details.
Rev. 1.0
47