INTERGER RF/IF DUAL PLL

S1M8821/22/23

15

Programmable Counter(N Counter)

If the Control Bits are 10(IF) or 11(RF), data is transferred from the 20-bit shift register into the N-latch. N Counter

consists of 7-bit swallow counter(A counter) and 11-bit main counter(B counter). Serial data format is shown below.

•

7-Bit Swallow Counter Division Ratio(A Counter)

•

11-Bit Main Counter Division Ratio(B Counter)

Division ratio : 3 to 2047

RF

IF

Division

Ratio(A)

N

7

N

6

N

5

N

4

N

3

N

2

N

1

Division

Ratio(A)

N

7

N

6

N

5

N

4

N

3

N

2

N

1

0

0000000

0

X

X

X

0000

1

0000001

1

X

X

X

0001

•

•••••••

•

•••••••

127

1111111

15

X

X

X

1111

Division ratio : 0 to 127

B

> A

Division ratio : 0 to 15

B > A

X = DON’T CARE condition

Division

Ratio

N

18

N

17

N

16

N

15

N

14

N

13

N

12

N

11

N

10

N

9

N

8

3

00000000011

4

00000000100

•

•••••••••••

2047

11111111111

C1

C2

N

1

N

2

N

3

N

4

N

5

N

6

N

7

N

8

N

9

N

10

N

11

N

12

N

13

N

14

N

15

N

16

N

17

N

18

N

19

N

20

LSB

MSB

Program Modes

Division Ratio of the N Counter, N

Control Bits