HMC440QS16G Datasheet, PDF (8/10 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
Applications Information
Simplified Block Diagram of 5-Bit Counter
10
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 defined 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 flip flops. The worst case asynchronous settling time can be calculated as follows:
T_{SETTLING MAX} = 32/f_IN (For Asynchronous Programming)
As an example, if the input frequency is 1 GHz, the maximum settling time is 32 nS
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