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AK1546 Datasheet(PDF) 11 Page - Asahi Kasei Microsystems |
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AK1546 Datasheet(HTML) 11 Page - Asahi Kasei Microsystems |
11 / 39 page ![]() [AK1546] 8. Block Functional Descriptions 1. Frequency Setup The following formula is used to calculate the frequency setting for the AK1546. Frequency setting (external VCO output frequency) = FPFD × N Where : N : Dividing number N = [ (P × B) + A ] FPFD : Phase detector frequency FPFD = [REFIN] pin input frequency / R counter dividing number P : Prescaler Value (See < Address2>:{Pre[1:0]}) B : B (Programmable) counter value (See <Address1>:{B[12:0]}) A : A (Swallow) counter value (See <Address1>:{A[5:0]}) Calculation example The output frequency of external reference frequency oscillator is 10MHz, and FPFD is 200kHz and VCO frequency is 2460MHz. AK1546 setting : R (Reference counter)=10000000/200000 = 50 (<Address0>:{R[13:0]}= “50”) P=32 (<Address2>:{PRE[1:0]}=”10Bin”) B=384 (<Address1>:{B[12:0]}=”384”) A=12 (<Address1>:{A[5:0]}=”12”) Frequency setting = 200kHz × [ (32×384) + 12] = 2460MHz Lower limit for setting consecutive dividing numbers In the AK1546, it is impossible to set consecutive dividing numbers below the lower limit. The lower limit is calculated by the following formula; Nmin=P 2-P For example, in the case of P=16, it can be set 240 and over as consecutive dividing numbers. MS1388-E-00 11 2012/3 |
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