S1M8831A Samsung Semiconductor, Inc., S1M8831A Datasheet - Page 24

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

S1M8831A/33
Reference Oscillator Input Control
The reference oscillator frequency is provided from an external reference such as TCXO through the OSCin and
OSCx pins. When the OSC bit is LOW, the oscillator input pins( OSCin and OSCx) drive the IF R and RF R
counters separately. When the OSC bit is HIGH, on the other hand, the oscillator input pin OSCin drives the IF R
and RF R counters commonly.
IF_N[22] = LOW
IF_N[22] = HIGH
24
Control Words
PWDN_IF
PWDN_IF
IF_N[20]
IF_N[20]
OSC
0
0
1
1
0
0
1
1
PWDN_RF
PWDN_RF
RF_N[22]
RF_N[22]
Control bits
0
1
0
1
0
1
0
1
IF_N[22]
LOW(powerdown)
LOW(powerdown)
LOW(powerdown)
LOW(powerdown)
Acronym
OSC
OSC
OSC
OSC
OSC
IF
IF
in
in
in
in
separate inputs;
OSCin: for IF,
OSCx: for RF
LOW (0)
LOW(powerdown)
LOW(powerdown)
LOW(powerdown)
LOW(powerdown)
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
OSC
OSC
OSC
OSC
RF
RF
in
in
x
x
for both RF and
through OSCin
common input
HIGH (1)
IF
oscillator input
Comments
reference
control