Sundance SMT712 - Manual (Page 48)

User Manual SMT712 Page 48 of 89 Last Edited: 11/12/2012 10:36:00
20 10100 DYN Unselected reference to PLL (not available when in differential mode).
19 10011 DYN Selected reference to PLL (differential reference when in differential mode).
18 10010 DYN REF2 clock (not available in differential mode).
17 10001 DYN REF1 clock (differential reference when in differential mode).
16 10000 LVL VS (PLL supply).
15 01111 LVL LD pin comparator output (active high).
14 01110 LVL Holdover active (active high).
13 01101 LVL Digital lock detect (DLD); active low.
12 01100 LVL Selected reference (low = REF1, high = REF2).
11 01011 LVL Status of VCO frequency (active high).
10 01010 LVL (DLD) AND (status of selected reference) AND (status of VCO).
9 01001 LVL (Status REF1 frequency) AND (status REF2 frequency).
8 01000 LVL Status REF2 frequency (active high).
7 01111 LVL Status REF1 frequency (active high).
6 00110 LVL Status of unselected reference (not available in differential mode); active high.
5 00101 LVL Status of selected reference (status of differential reference); active high.
4 00100 DYN Unselected reference to PLL (not available in differential mode).
3 00011 DYN Selected reference to PLL (differential reference when in differential mode).
2 00010 DYN REF2 clock (N/A in differential mode).
1 00001 DYN REF1 clock (differential reference when in differential mode).
0 00000 LVL Ground (dc).
4.6.1.1.20 Clock Generator (AD9516-2) Register 0x1C – PLL Control
7 – 0xF8 (write).
Clock Generator (AD9516-2) Register 0x1C – PLL Control 7 – 0xF8 (write)
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Disable
Switchover
Deglitch
Select REF2 Use
REF_SEL
pin
Automatic
Reference
Switchover
Stay on
REF2
REF2
Power on
REF1
Power on
Differential
Reference
Default ‘0’ ‘0’ ‘0’ ‘1’ ‘1’ ‘0’ ‘0’ ‘0’
Clock Generator (AD9516-2) Register 0x1C – PLL Control 7 – 0xF8 (write)
Setting Bit 7 Description (Disable Switchover)
0 0 enable switchover deglitch circuit.
1 1 disable switchover deglitch circuit.
Setting Bit 6 Description (Select REF2)
0 0 select REF1.
1 1 select REF2.
Setting Bit 5 Description (Use REF_SEL pin)
0 0 use Register 0x1C<6>.
1 1 use REF_SEL pin.
Setting Bit 4 Description (Automatic Reference Switchover)
0 0 manual reference switchover.