HMC988LP3E Datasheet, PDF (22/22 Pages) Hittite Microwave Corporation – PROGRAMMABLE CLOCK DIVIDER AND DELAY

HMC988LP3E
v01.0512
PROGRAMMABLE CLOCK DIVIDER AND DELAY
DC - 4 GHz
Table 12. Reg 04h - Configuration
Bit
Name
Width Default
[0]
Broadcast Mode
1
0
[1]
External SYNC Pin EN
1
1
[2]
External SLIP Pin EN
1
0
[3]
RX Buffer DC Bias Select
1
0
[4]
Delay Line Enable
1
0
[5]
On-Chip Regulator Bypass
1
0
[8:6] Reserved
3
0
Description
if 1, a write to Chip Addr “111” will be listened to by all slaves.
Useful for synchronizing multiple dividers
External pin can be used to start-up divider synchronously.
External pin can be used to slip divider synchronously
Both ExtSLIP and ExtSYNC bits should not be ‘1’ at the same time
Use 1 for sinusoidal / non-LVPECL AC coupled inputs
Use 0 for natural low-noise path, 1 enables the fine delay
1 bypass the on-chip regulator, 0 enable the on-chip regulator
Table 13. Reg 05h - General Purpose Output
Bit
Name
Width Default
Description
[2:0] GPO Select
0: 0
1: 1
2: slip req
2
0
3: 0
4: sync req
5: sync delayed
6: waiting for clock pulse (post sync)
7: spare
[3]
Force GPO Pin on GPO only
1
0
no automux to serial data output
[4]
Force GPO Pin on SDO only
1
0
no automux to GPO selected data PRIORITY
[5]
Force GPO Pin to HiZ
1
0
Force GPO pin to HiZ
[8:6] Reserved
3
0
Table 14. Reg 06h - SPI Triggers
Bit
Name
Width
[0]
SPI SYNC Signal
1
[1]
SPI SLIP Signal
1
[2]
Output Launch Phase
1
[8:3] Reserved
6
Default
1
0
0
0
Description
0 - holds divider in reset, 1 allows startup
A 0 to 1 level change is sensed by the input clock, and causes a full input
cycle-slip. The signal must be maintained for > 4 Tvco input clock cycles before
brought low.
0: Falling Edge (Early)
1: Rising Edge (Late)
To delay the output by 1/2 cycle you can switch from early to late. To go back, you
must force N-1 full cycle slips, and switch back from late to early.
Table 15. Reg 07 - Delay Lines
Bit
Name
Width
[5:0] Delay Line Setpoint
6
[8:6] Reserved
3
Default
4
0
Description
Delay = Setpoint *20 ps + 300 ps (Max of 300 -> 1500 ps)
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