AK8186B Datasheet, PDF (30/69 Pages) Asahi Kasei Microsystems – Multi Output Clock Generator with Integrated 2.0GHz VCO

AK8186B
Figure 19. Automatic Holdover
Frequency Status Monitors
The AK8186B has a frequency status monitor to indicate if the REF1/2 and the VCO frequency below a
threshold frequency. There are two threshold frequencies such as normal and extended for REF1/2. The
VCO frequency is monitored at the output of the prescaler.
Table 24 Setting Frequency Status Monitors
Monitored
Monitor
Minimum threshold frequency
signal
Enable
register
VCO
0x1B[7]=1 0.5 MHz
Status
indication
register
0x1F[3]
REF2
REF1
0x1B[6]=1
0x1B[5]=1
normal 0.5 MHz (0x1A[6]=0)
extended 4 kHz (0x1A[6]=1)
0x1F[2]
0x1F[1]
Sep-2012
- 30 -
draft-E-02