LMX2330L datasheet(14/23 Pages) NSC | PLLatinumTM Low Power Dual Frequency Synthesizer for RF Personal Communications

Part No.	LMX2330L

Description	PLLatinumTM Low Power Dual Frequency Synthesizer for RF Personal Communications

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Manufacturer	NSC [National Semiconductor (TI)]

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Functional Description (Continued)

01280608

7-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER)

RF

Divide

N

7

N

6

N

5

N

4

N

3

N

2

N

1

Ratio

A

0

000000

0

1

000000

1

•

••••••

•

127

111111

1

Notes: Divide ratio: 0 to 127

B

≥ A

IF

Divide

N

7

N

6

N

5

N

4

N

3

N

2

N

1

Ratio

A

0

XXX

0

1

XXX

0

1

•

••••••

•

15

XXX

1

X = DON’T CARE condition

11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER)

Divide

N

18

N

17

N

16

N

15

N

14

N

13

N

12

N

11

N

10

N

9

N

8

Ratio

B

3

0000000001

1

4

0000000010

0

•

••••••••••

•

2047

1111111111

1

Note: Divide ratio: 3 to 2047 (Divide ratios less than 3 are prohibited)

B

≥ A

PULSE SWALLOW FUNCTION

f

VCO = [(P xB)+ A]xfOSC/R

f

VCO: Output frequency of external voltage controlled oscillator (VCO)

B:

Preset divide ratio of binary 11-bit programmable counter (3 to 2047)

A:

Preset divide ratio of binary 7-bit swallow counter

(0

≤ A ≤ 127 {RF}, 0 ≤ A ≤ 15 {IF}, A ≤ B)

f

OSC: Output frequency of the external reference frequency oscillator

R:

Preset divide ratio of binary 15-bit programmable reference counter (3 to 32767)

P:

Preset modulus of dual moduIus prescaler (for IF; P = 8 or 16;

for RF; LMX2330L: P = 32 or 64

LMX2331L/32L: P = 64 or 128)

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LMX2330L Datasheet(PDF) 14 Page - National Semiconductor (TI)

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