BU2365FV_08 Datasheet, PDF (14/17 Pages) Rohm – Clock Generator with Built-in VCXO for Audio/Video Equipments

●Application Circuit
1:VDD54M
L：33.8688MHz
OPEN：36.8640MHz
2:VSS54M
3:FSEL
4:TEST
5:AVDD
6:AVSS
7:XTAL_IN
27.0000MHz
8:XTAL_OUT
9:VDD_V
0.0V～VDD
10:VCTRL
11:VSS_V
27.0000MHz
12:VCXO_OUT
24:CLK54M
23:OE
22:CLK768FS
21:VDD
20:VSS
19:CLK384FS
18:CLK512FS
17:VDD_B
16:BUF_IN
15:VSS_B
14:BUF_OUT1
13:BUF_OUT2
54.0000MHz
(CL=15pF)
OPEN=enable
L=power down
FSEL=L：33.8688MHz
FSEL=OPEN：36.864MHz
(CL=32pF)
18.432MHz
(CL=32pF)
24.576MHz
(CL=15pF)
27.0000MHz
27.0000MHz
(CL=50pF)
27.0000MHz
(CL=50pF)
Fig.82
Note)
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2)
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5)
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8)
Basically, mount ICs to the substrate for use. If the ICs are not mounted to the substrate, the characteristics of ICs may
not be fully demonstrated.
Mount 0.1uF capacitors in the vicinity of the IC pins between 1PIN (VDD54M) and 2PIN (VSS54M), 5PIN (AVDD) and
6PIN (AVSS), 9PIN (VDD_V) and 11PIN (VSS_V), 17PIN (VDD_B) and 15PIN (VSS_B), and 21PIN (VDD) and 20PIN
(VSS), respectively.
For the fine-tuning of frequencies, insert several numbers of pF in the 7PIN and 8PIN to GND.
The electrical characteristics have been all evaluated with the use of the crystal oscillator NX5032GA (Spec. No.
EXS00A-00278) manufactured by NIHON DEMPA KOGYO CO., LTD., under the conditions of Limiting resistance
Rd=30Ω and Load CL=10pF. Consequently, in order to use the BU2365FV, the said crystal oscillator is recommended.
As to the jitters, the TYP values vary with the substrate, power supply, output loads, noises, and others. Besides, for the
use of the BU2365FV, the operating margin should be thoroughly checked.
Depending on the conditions of the substrate, mount an additional electrolytic capacitor between the power supply and
GND terminal.
For EMI protection, it is effective to put ferrite beads in the origin of power supply to be fed to the BU2365FV from the
substrate or to insert a capacitor (of 1Ω or less impedance), which bypasses high frequency desired, between the
power supply and the GND terminal.
Even though we believe that the example of the application circuit is worth of a recommendation, please be sure to
thoroughly recheck the characteristics before use.
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