S1M8837 Samsung Semiconductor, Inc., S1M8837 Datasheet - Page 22

• Manufacturer Part Number: S1M8837
• Description: Fractional-n Rf/integer-n If Dual Pll
• Manufacturer: Samsung Semiconductor, Inc.

S1M8836/37
IF Power down mode table
Programmable Counter Reset Control
Counter Reset mode resets R & N counters.
RF Fractional-N selection
CMOS Output Control
In the Speedy Lock mode, the OUT0 and OUT1 pins can be utilized as synchronous switches between active low
and a 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( 8X) is selected and otherwise to a tri-state. For using a
programmable CMOS output, the CMOS output bit(W2[21]= LOW) should be activated and then the desired logic
level should be programmed with the control bits W2[19] for OUT0 and W2[20] for OUT1.
22
RF_CTL_WORD
RF_CTL_WORD
IF_CTL_WORD
Control Words
Control Words
Control Words
CMOS
W1[20]
0
0
1
1
Control bits
Control bits
Control bits
W4[19]
W1[21]
W4[21]
W2[21]
W2[20]
W2[19]
W1[19]
Frac_N_SEL
Acronym
0
1
0
1
RF_CNT_RST
IF_CNT_RST
Speedy Lock
Acronym
Acronym
OUT1
OUT0
LOW (0)
reserved
IF PLL active
IF PLL active, only charge pump to TRISTATE
Asynchronous power down
Synchronous power down
normal operation
normal operation RF counter reset
CMOS output
voltage LOW
voltage LOW
LOW (0)
LOW (0)
Fractional-N mode
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
Power down mode status
HIGH (1)
IF counter reset
voltage HIGH
voltage HIGH
Speedy Lock
HIGH (1)
HIGH (1)
mode
RF;PLL mode
selection
Comments
Comments
Comments
pin #23
pin #24
RF
IF