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LC72121MA View Datasheet(PDF) - SANYO -> Panasonic

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LC72121MA Datasheet PDF : 24 Pages
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IF Counter Operation
LC72121MA
CE
Frequency
measurement time
IFIN
Data with CTE 1
Wait time
Measurement time
GT
Count start
Count end (end-UC)
Applications must first, before starting an IF count operation reset the IF counter by setting CTE in the serial data to 0.
The IF counter operation is started setting CTE in the serial data from 0 to 1. Although the serial data is latched by
dropping the CE pin from high to low, the IF signal input to the IFIN pin must be provided within the wait time from
the point CE goes low. Next, the readout of the IF counter after measurement is complete must be performed while CTE
is still 1, since the counter will be reset if CTE is set to 0.
Note: If IF counting is used, applications must determine whether or not the IF IC SD (station detect) signal is present
in the microcontroller software, and perform the IF count only if that signal is asserted. This is because auto-
search techniques that use IF counting only are subject to incorrect stopping at points where there is no station
due to IF buffer leakage.
Note that the LC72121MA input sensitivity can be controlled with the IFS bit in the serial data. Reduced
sensitivity mode (IFS = 0) must be selected when this IC is used in conjunction with an IF IC that does not
provide an SD output and auto-search is implemented using only IF counting.
IFIN Minimum Sensitivity Standard
IFS data
1 (Normal mode)
0.4 f < 0.5
40mVrms (0.1 to 3mVrms)
0.5 f < 8
40mVrms
Input frequency : f [MHz]
8 f 15
40mVrms(1 to 15mVrms)
0 (Degraded sensitivity mode)
70mVrms(5 to 10mVrms)
70mVrms
70mVrms(30 to 40mVrms)
Note: Values in parentheses are actual performance values that are provided for reference purposes.
No.A2009-17/24
 

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