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6

6 - 7

HMC699LP5(E) Programming Truth Table, Continuous Division Ratios

HMC699LP5(E) Programming

Division

Ratio N

A Counter

Decimal set

swallow s

Decimal set

(LsB)

A0

A1

A2

A3

A4

A5

(LsB)

s0

s1

s2

56

6

0

0

1

1

0

0

0

0

0

0

57

6

1

0

1

1

0

0

0

1

0

0

58

6

2

0

1

1

0

0

0

0

1

0

59

6

3

0

1

1

0

0

0

1

1

0

60

6

4

0

1

1

0

0

0

0

0

1

61

6

5

0

1

1

0

0

0

0

0

1

62

6

6

0

1

1

0

0

0

0

1

1

63

6

7

0

1

1

0

0

0

1

1

1

64

7

0

1

1

1

0

0

0

0

0

0

65

7

1

1

1

1

0

0

0

1

0

0

66

7

2

1

1

1

0

0

0

0

1

0

67

7

3

1

1

1

0

0

0

1

1

0

HMC699LP5 / 699LP5E

v05.0110

7 GHz INTEGER N SYNTHESIZER

CONTINUOUS (N = 56 - 519), NON-CONTINUOUS (N = 16 - 54)

The decimal value of A counter and s counter can be defined as:

A = int (

) - 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

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 (

) - 1 = 1

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.

N

8

18

8

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

Phone: 781-329-4700 • Order online at www.analog.com

Application Support: Phone: 1-800-ANALOG-D