KB8821 datasheet(13/21 Pages) SAMSUNG

13 / 21 page

PRELIMINARY SPECIFICATION (V1.5)

FREQUENCY SYNTHESIZER

KB8821/22/23

99-06-15

FUNCTIONAL DESCRIPTION- Continued

Pulse Swallow Function

fVCO=[ ( P X B ) + A ] x fOSCin / R

fVCO : External VCO output frequency

P : Preset modulus of dual modulus prescaler

(for KB8821/22 RF:P=64 or 128,

for KB8823 RF:P=32 or 64,

for IF: P=8 or 16)

B : 11-bit main counter division ratio (3

≤ B ≤ 2047)

A : 7-bit swallow counter division ratio

(for RF: 0

≤ Α ≤ 127, for IF: 0 ≤ Α ≤ 15, Α ≤ B)

fOSCin : External reference frequency(from external oscillator)

R : 15-bit reference counter division ratio (3

≤ R ≤ 32767)

Program Mode

♦ Mode Select Truth Table

* The charge pump output current of ICPo LOW = 1/4 × ICPo HIGH.

R16

R17

R18

R19

R20

IF Phase

Detector Polarity

IF ICPo

IF CPoIF

High Impedance

RF Phase

Detector Polarity

RF ICPo

RF CPoIF

High Impedance

Phase Detector Polarity

CPoIF High Impedance

ICPo

IF Prescaler

RF Prescaler

KB8821/22

(KB8823)

Pwdn

Negative

Normal Operation

Low

8/9

64/65

(32/33)

Pwr Up

Positive

High Impedance

High

16/17

128/129

(64/65)

Pwr Dn

N19

N20

IF Prescaler

Pwdn IF

RF Prescaler

Pwdn RF

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