S1M8821 Samsung Semiconductor, Inc., S1M8821 Datasheet - Page 16

• Manufacturer Part Number: S1M8821
• Description: Interger Rf/if Dual Pll Frequency Synthesizer
• Manufacturer: Samsung Semiconductor, Inc.

S1M8821/22/23
Pulse Swallow Function
Program Mode
•
* The charge pump output current of I
16
0
1
C1
f
f
P : Preset modulus of dual modulus prescaler
B : 11-bit main counter division ratio (3
A : 7-bit swallow counter division ratio
f
R : 15-bit reference counter division ratio (3
0
0
VCO
VCO
OSCin
Mode Select Truth Table
(for S1M8821/22 RF:P=64 or 128,
(for RF: 0
Phase Detector Polarity
=[ ( P X B ) + A ] x f
: External VCO output frequency
: External reference frequency(from external oscillator)
C2
0
1
Negative
Positive
C1
A
1
1
127,
Detector Polarity
Detector Polarity
OSCin
RF Phase
IF Phase
C2
for IF: 0
0
1
R16
/ R
CPoIF High Impedance
Normal Operation
High Impedance
CPo
A
LOW = 1/4
15, A
for S1M8823 RF:P=32 or 64,
B
2047)
R
RF Prescaler
IF Prescaler
B)
32767)
RF I
IF I
N19
R17
I
CPo
CPo
CPo
HIGH.
High
I
Low
CPo
IF Prescaler
High Impedance
High Impedance
16/17
8/9
for IF: P=8 or 16)
RF CPoIF
IF CPoIF
R18
Pwdn RF
Pwdn IF
128/129 (64/65)
N20
64/65 (32/33)
RF Prescaler
INTERGER RF/IF DUAL PLL
S1M8821/22
(S1M8823)
R19
RF
LD
LD
IF
Pwr Up
Pwr Dn
Pwdn
R20
RF
Fo
Fo
IF