S1M8831A Samsung Semiconductor, Inc., S1M8831A Datasheet - Page 16

• Manufacturer Part Number: S1M8831A
• Description: Fractional-n Rf/integer-n If Dual Pll Frequency Synthesizer
• Manufacturer: Samsung Semiconductor, Inc.

S1M8831A/33
— Counter reset mode resets R & N counters.
— IF charge pump current can be selected to high current (8X) or low current (1X) mode.
— In the Speedy Lock mode, the OUT0 and OUT1 pins can be utilized as synchronous switches between active
— For using a programmable CMOS output, the CMOS output bit(RF_N[20]=L) should be activated and then
16
OSC
IF_CTL_WORD
IF_CP_WORD
RF_CTL_WORD
CMOS
RF_CP_WORD
foLD
Control Words
low and tri-state. The Speedy Lock mode activates the OUT0 and OUT1 pins to be connected to GROUND
with a low impedance (< 150 ) while a high charge pump gain ( S 8X) is selected and otherwise to the
TRISTATE.
the desired logic level should be programmed with the control bits RF_N[18] for OUT0 and RF_N[19] for
OUT1.
Control bits
RF_N[17:14]
RF_N[5:2]
RF_N[23]
RF_N[22]
RF_N[21]
RF_N[20]
RF_N[19]
RF_N[18]
RF_N[13]
IF_N[22]
IF_N[21]
IF_N[20]
IF_N[19]
IF_N[18]
IF_N[17]
RF_CNT_RST Normal operation
RF_PFD_POL Negative slope
IF_CNT_RST
IF_PFD_POL
Speedy_Lock
IF_CP_GAIN
RF_CP_LVL
Frac-N_SEL
PWDN_RF
PWDN_IF
Acronym
PWDN
OUT1
OUT0
OSC
foLD
Separate inputs;
OSCin: for IF,
OSCx: for RF
Normal operation
Power up
Asynchronous
power down
1X
Negative slope
Power up
Integer-N mode
CMOS output
Voltage LOW
Voltage LOW
Select 16-level charge pump current
(RF charge pump gain for control
codes in detail)
Select LDs and monitoring mode of
internal counters. (foLD control for
control codes in detail)
LOW (0)
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
Common input
through OSCin for
both RF and IF
IF counter reset
Power down
Synchronous
power down
8X
Positive slope
RF counter reset
Power down
Fractional-N
mode
Speedy Lock
mode
Voltage HIGH
Voltage HIGH
Positive slope
HIGH (1)
Reference
oscillator input
control
IF
IF
RF and IF
IF charge pump
IF PFD
RF
RF
RF; PLL mode
selection
pin #23
pin #24
RF charge pump
RF PFD
Lock Detector
(LD), test mode
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