AK1573 Datasheet, PDF (4/42 Pages) Asahi Kasei Microsystems – Low Noise Integrated VCO

[AK1573/AK1573B/AK1573C]
6.1. Block Diagram
6. Block Diagram and Functions
REFIN Buffer
REFIN
R COUNTER
14 bit
PHASE
FREQUENCY
DETECTOR
LOCK
DETECT
LD
SWALLOW
COUNTER
6 bit
PROGRAMMABLE
COUNTER
13 bit
CLK
DATA
LE
Digital
Control
Interface
LDO
PRESCALER
8/9, 16/17, 32/33, 64/65
N COUNTER
VBG
CHARGE
PUMP
FAST
COUNTER
TANK
1, 1/2, 1/4,
1/8, 1/16,
1/32, 1/64
BIAS
CP
Loop
Filter
VCNT
SCAP
RFOUT_P
RFOUT_N
Figure.1 Block Diagram
6.2. Functions
Block
N counter
VCO Divider
R counter
VCO
(Voltage Controlled Oscillator)
PFD(Phase Frequency Detector)
Charge Pump
Function
It is composed of prescaler, Swallow Counter and
Programmable Counter. VCO output signal is divided by N and
passed to phase frequency detector (PFD).
It divides VCO output signal and passes it to output
buffer. Dividing ratio of 1, 2, 4, 8, 16, 32 and 64 can be selected.
It divides a reference signal by R and passes it to
phase frequency detector (PFD).
It generates a signal of the frequency corresponding to a voltage
inputted to VCNT pin.
It outputs a signal corresponding to phase difference between N
counter and R counter.
Sweep or pull-in a current corresponding to a signal from PFD.
015009351-E-00
-4-
2015/8