S1M8821 Samsung Semiconductor, Inc., S1M8821 Datasheet - Page 17

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

INTERGER RF/IF DUAL PLL
•
Depending on VCO characteristics, R16 bit should be set as follows :
VCO characteristics are positive like (1) : R16 HIGH
VCO characteristics are negative like (2) : R16 LOW
•
Phase Detector Polarity
foLD (Pin10) Output Truth Table
— When the PLL is locked and a lock detect mode is selected, the foLD output is HIGH, with narrow pulses
— Counter Reset mode resets R & N counters.
— The high speed lock mode sets the foLD output pin to be connected to ground with a low impedance
(RF LD)
RF R19
LOW.
( 110 ).
0
0
1
1
0
0
0
0
0
0
1
1
(IF LD)
IF R19
0
1
0
1
0
0
1
1
0
1
0
1
RF R20
(RF fo)
0
0
0
0
0
1
0
1
1
1
1
1
IF R20
(IF fo)
0
0
0
0
1
0
1
0
1
1
1
1
Disabled (default LOW)
IF Lock Detect
RF Lock Detect
RF and IF Lock Detect
IF Reference Divider Output
RF Reference Divider Output
IF Programmable Divider Output
RF Programmable Divider Output
High Speed Lock mode
IF Counter Reset
RF Counter Reset
RF and IF Counter Reset
foLD Output State
VCO Characteristics
VCO Input Voltage
S1M8821/22/23
(2)
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