Datasheet

AD9510 Data Sheet
Rev. B | Page 26 of 56
PLL WITH EXTERNAL VCO AND BAND-PASS
FILTER FOLLOWED BY CLOCK DISTRIBUTION
An external band-pass filter (BPF) can be used to improve the
phase noise and spurious characteristics of the PLL output. This
option is most appropriate to optimize cost by choosing a less
expensive VCO combined with a moderately priced filter. Note
that the BPF is shown outside of the VCO-to-N divider path,
with the BP filter outputs routed to CLK1. Save some power by
shutting off unused functions, and by powering down any unused
clock channels (see the Register Map and Description section).
Figure 32. AD9510 with VCO and BPF Filter
05046-012
R
N
PFD
STATUS
CHARGE
PUMP
LVDS/CMOS
DIVIDE
LVDS/CMOS
DIVIDE
LVPECL
DIVIDE
LVPECL
DIVIDE
LVPECL
DIVIDE
LVPECL
DIVIDE
LVDS/CMOS
DIVIDE
LVDS/CMOS
DIVIDE
∆ T
∆
T
SERIAL
PORT
FUNCTION
V
REF
AD9510
PLL
REF
CLK1 CLK2
REFERENCE
INPUT
REFIN
LOOP
FILTER
VCO
BPF
CLOCK
OUTPUTS