HMC699LP5_10 Datasheet, PDF (7/12 Pages) Hittite Microwave Corporation – 7 GHz INTEGER N SYNTHESIZER CONTINUOUS (N = 56 - 519), NON-CONTINUOUS (N = 16 - 54)

HMC699LP5 / 699LP5E
v05.0110
7 GHz INTEGER N SYNTHESIZER
CONTINUOUS (N = 56 - 519), NON-CONTINUOUS (N = 16 - 54)
HMC699LP5(E) Programming
The decimal value of A counter and S counter can be defined as:
A = int
(
N
8
)
-
1
and S = N - 8 (A + 1)
where N = 16 to 519
For a valid division ratio N, the A counter and S counter must satisfy the condition: A +1 ≥ S
6
Therefore, N = 16 to 54 will result into non-continuous division ratio
and N = 56 to 519 will be continuous division ratio.
Example: Given a reference frequency, Fref = 11 MHz, and VCO output frequency, Fvco = (198 to 297) MHz, results
in N = 18 to 27. The decimal value of A counter and S counter for N = 18 will be:
A = int ( ¹⁸ ) - 1 = 1
8
and S = 18 - 8 (1 + 1) = 2
Since the calculated value of A and S satisfy the condition of A + 1 ≥ S, the N = 18 is usable division ratio.
The division ratio, N = 23, however, will result in A = 1 and S = 7. Under the condition A +1 ≥ S, the division ratio N =
23 is not usable.
In this example, the division ratio, N = 19 to 23 cannot be programmed and therefore, the frequency range of 209 MHz
to 253 MHz cannot be used.
6-7
HMC699LP5(E) Programming Truth Table, Continuous Division Ratios
Division
Ratio N
56
57
58
59
60
61
62
63
64
65
66
67
A Counter
Swallow S
(LSB)
(LSB)
Decimal Set
Decimal Set
A0
A1
A2
A3
A4
A5
S0
S1
S2
6
0
0
1
1
0
0
0
0
0
0
6
1
0
1
1
0
0
0
1
0
0
6
2
0
1
1
0
0
0
0
1
0
6
3
0
1
1
0
0
0
1
1
0
6
4
0
1
1
0
0
0
0
0
1
6
5
0
1
1
0
0
0
0
0
1
6
6
0
1
1
0
0
0
0
1
1
6
7
0
1
1
0
0
0
1
1
1
7
0
1
1
1
0
0
0
0
0
0
7
1
1
1
1
0
0
0
1
0
0
7
2
1
1
1
0
0
0
0
1
0
7
3
1
1
1
0
0
0
1
1
0
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