AK1590 Datasheet, PDF (3/36 Pages) Asahi Kasei Microsystems – 1GHz Delta-Sigma Fractional-N Frequency Synthesizer

3. Block Diagram
[AK1590]
LDO
REFIN
R COUNTER
8bit
CLK
DATA
LE
REGISTER
24bit
NUM + OFFSET
ΔΣ
18bit
INT
SUM
N DIVIDER
PULSE
SWALLOW
COUNTER
RFINP
+
RFINN
-
PRESCALER
4/5, 8/9,16/17
PHASE
FREQENCY
DETECTOR
LOCK DETECT
CHARGE PUMP 1
CHARGE PUMP 2
(For Fast Lock Up)
FAST
COUNTER
13bit
BIAS
CP
CPZ
SWIN
LD
Fig. 1 Block Diagram
MS1478-E-01
3
2013/2