mc145156 Lansdale Semiconductor, Inc., mc145156 Datasheet - Page 31

• Manufacturer Part Number: mc145156
• Description: Pll Frequency Synthesizer Family
• Manufacturer: Lansdale Semiconductor, Inc.

LANSDALE Semiconductor, Inc.
higher order bits above “a” ignored) combined into a single
binary counter of n + a bits in length (n = number of divider
stages in the ÷N counter). The MSB of this “hypothetical”
counter is to correspond to the MSB of ÷ N and the LSB is to
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3. Assume the ÷N counter and the ÷A counter (with all the
DEVICE A
NOTE: ML12009, ML12011, and ML12013 are pin equivalent.
MC10131
MC10138
ML12015, ML12016, and ML12017 are pin equivalent.
DEVICE
B
Figure 13. Dual–Modulus Values
DEVICE A
ML12009
÷
÷
20/
50/
÷
÷
www.lansdale.com
21
51
÷
÷
ML12011
32/
80/
correspond to the LSB of ÷ A. The system divide value, N T ,
now results when the value of N T in binary is used to program
the “new” n + a bit counter.
achievable (shown in Figure 13).
DEVICE B
÷
÷
By using the two devices, several dual–modulus values are
33
81
MC
÷
÷
ML12013
100/
40/
÷
÷
41
101
ML1451xx
Issue A