AK1541_17 Datasheet, PDF (3/37 Pages) Asahi Kasei Microsystems – 20 to 600Mhz Delta-Sigma Fractional-N Frequency Synthesizer

3. Block Diagram
[AK1541]
REFIN
CLK
DATA
LE
LDO
R COUNTER
8bit
REGISTER
24bit
PHASE
FREQENCY
DETECTOR
ΔΣ
18bit
N DIVIDER
PULSE
SWALLOW
COUNTER
LOCK DETECT
CHARGE PUMP 1
CHARGE PUMP 2
(For Fast Lock Up)
FAST
COUNTER
13bit
RFINP
+
RFINN
-
PRESCALER
4/5,8/9,16/17
BIAS
CP
CPZ
SWIN
LD
Fig. 1 Block Diagram
MS1043-E-05
3
2013/03