BU3087FV-E Datasheet, PDF (17/26 Pages) Rohm – Built in VCXO,Spread-Spectrum Clock Generator

BU3087FV
Datasheet
●Typical Application Circuit
In the case of Spread-Spectrum Modulation Rate =±0.75% setting, 7Pin_MODSEL1 connects GND, and 8Pin_MODSEL2
connect Power supply directly following the diagram.
In the case of other Modulation Rate setting, should be changed connections as a Table of Spread-Spectrum Modulation (P3).
(In the case of ±0.50% setting, it is no problem that 7Pin_MODSEL1 and 8Pin_MODSEL2 are OPEN Manages.)
3.3V (Typ.)
0.1μF
0.1μF
CL
27MHz Crystal
CL
XIN
AVDD1
AVSS1
VCTRL
AVDD2
AVSS2
MODSEL1
MODSEL2
XOUT
PDB
CLKOUT
VDD
VSS
SSON
TEST
CLK27M
RD
0.1μF
Figure 48. Modulation Rate =±0.75% setting Typical Application Circuit
In the case of Spread-Spectrum OFF setting, 11Pin_SSON connect GND directly as the following diagram.
(In the case of using Spread-Spectrum, it is no problem that 11Pin_SSON are OPEN Manages.)
3.3V (Typ.)
0.1μF
0.1μF
CL
27MHz Crystal
CL
XIN
AVDD1
AVSS1
VCTRL
AVDD2
AVSS2
MODSEL1
MODSEL2
XOUT
PDB
CLKOUT
VDD
VSS
SSON
TEST
CLK27M
RD
0.1μF
Figure 49. Spread-Spectrum OFF setting Typical Application Circuit
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TSZ22111・15・001
17/23
TSZ02201-0E3E0J500040-1-2
17.AUG.2012 Rev.001