S1M8837 Samsung Semiconductor, Inc., S1M8837 Datasheet - Page 23

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

FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
foLD Control
Lock Detector(LD)
There is analog mode for S1M8836/37. The foLD bits, W3[21:18], are used to select the lock detection mode and
to output the selected lock signal through the foLD pin.
The foLD output becomes HIGH with narrow pulsed LOW while both RF and IF PLLs are locked and thereby the
output should be low-pass filtered for a DC locked voltage HIGH.
Control Words
When the PLL is locked and the analog lock detect mode is selected, the foLD output is HIGH, with narrow
pulses LOW.
foLD[3]
foLD
X
X
X
X
0
0
0
0
1
1
1
1
foLD[2]
Control bits
W3[21:18]
0
0
0
0
1
1
1
1
0
0
0
0
foLD[1]
0
0
1
1
0
0
1
1
0
0
1
1
Acronym
foLD
foLD[0]
0
1
0
1
0
1
0
1
0
1
0
1
select LDs monitoring mode of
LOW (0)
internal counters.
RF and IF Analog Lock Detect
Disabled(default LOW)
Reserved Test Mode
Reserved Test Mode
Reserved Test Mode
Reserved Test Mode
Reserved Test Mode
Reserved Test Mode
RF R Counter Output
RF N Counter Output
IF R Counter Output
IF N Counter Output
foLD Output State
HIGH (1)
Lock Detector
(LD), Test mode
Comments
S1M8836/37
23