HMC440QS16G Datasheet, PDF (9/10 Pages) Hittite Microwave Corporation – HBT DIGITAL PHASE-FREQUENCY DETECTOR, 10 - 1300 MHz, w/ INTEGRATED 5-BIT COUNTER, 10 - 2800 MHz

v00.0403
HMC440QS16G
MICROWAVE CORPORATION
HBT DIGITAL PHASE-FREQUENCY DETECTOR,
10 - 1300 MHz, w/ INTEGRATED 5-BIT COUNTER, 10 - 2800 MHz
10
Synchronous Programming
For applications which can not tolerate a momentary undefined division ratio, which normally occurs while changing the
data bits (A0-A4) at random, synchronous programming can be used. Data is loaded into the counter on every rising
edge of the clock which occurs while the output (OUT) is “HIGH”. The typical minimum setup and hold times are shown
in the table below as a function of frequency. For precision applications, the rising edge of the complementary output
may be used to latch the new data bits (A0-A4), so that all bits are settled before the next load cycle.
T_{SETTLING MAX} = N/f_IN (For Synchronous Programming)
Where N is the desired division ratio, and f_IN = Input Frequency (Hz)
Parameter
t
SETUP
t_HOLD
0.5 GHz
200 ps
700 ps
1 GHz
200 ps
300 ps
2 GHz
200 ps
120 ps
Programmable Divider Timing Requirements
for Synchronous Programming
OUT
OUT
A0-A4
IN
CURRENT DATA
t
SU
t
HOLD
Rising Edge to
Clock New Data
NEW DATA
Data Load
Rising Edge
10 - 116
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