0.35µm 20MHZ-170MHZ FSPLL
µ
AL2007LA
GENERAL DESCRIPTION
The AL2007LA is a Phase-Locked Loop (PLL) frequency synthesizer constructed in CMOS on single monolithic
structure. The PLL macrofunctions provide frequency multiplication capabilities.
The output clock frequency Fout is related to the reference input clock frequency Fin by the following equation:
Fout = ( m*Fin ) / ( p* 2S)
Where, Fout is the output clock frequency. Fin is the reference input clock frequency. m,p and s are the values for
programmable dividers. AL2007LA consists of a phase/Frequency Detector(PFD), a Charge Pump an External
Loop Filter, a Voltage Controlled Oscillator(VCO), a 6bit Pre-divider, an 8bit Main divider and 2bit Post Scaler as
shown in Figure1.
FEATURES
— 0.35um CMOS device technology
— 3.3 Volt Single power supply
— VCO frequency range: 60~170MHz
— Output frequency range: 20~170MHz
— Jitter ±150ps
— Duty ratio 40% to 60% at 170MHz
— Frequency changed by programmable divider
— Power down mode
IMPORTANT NOTICE
Please contact SEC application engineer to confirm the proper selection of M,P,S value.
FUNCTIONAL BLOCK DIAGRAM
Fin
Pre Divider
P
PFD
Charge
Pump
Loop
Filter
(External)
VCO
Post Scaler
S
Fout
Main Divider
M
Figure 1. Phase Lockd Loop Block Diagram
1
SAMSUNG [ SAMSUNG SEMICONDUCTOR ]
