hmc440qs16g Hittite Microwave Corporation, hmc440qs16g Datasheet - Page 8

• Manufacturer Part Number: hmc440qs16g
• Description: Hbt Digital Phase-freq. Detector, 10 - 1300, Mhz W/ 5-bit Counter, 10 - 2800 Mhz
• Manufacturer: Hittite Microwave Corporation

HMC440QS16G
440QS16GE
/
v02.0705
HBT DIGITAL PHASE-FREQ. DETECTOR,
10 - 1300, MHz w/ 5-BIT COUNTER, 10 - 2800 MHz
6
Applications Information
Simplifi ed Block Diagram of 5-Bit Counter
Asynchronous Programming
The 5-Bit programmable counter counts-down from the programmed value of the data bits to zero and issues an
output pulse at the end of each cycle. Settling time of the programmable 5-Bit counter is defi ned as the maximum
time required for the counter to change the division ratio N to a new value after the data bits have settled. The worst
case settling time occurs if the data bits A0 thru A4 are changing during the load cycle. Under this condition, the
data bits may potentially be erroneous when they are clocked in and in the worst case could be all 1’s, requiring 32
clock cycles until the correct data is re-loaded into the fl ip fl ops. The worst case asynchronous settling time can be
calculated as follows:
T
= 32/f
(For Asynchronous Programming)
SETTLING MAX
IN
As an example, if the input frequency is 1 GHz, the maximum settling time is 32 nS
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