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| BU2285FV_08 Datasheet, PDF (13/17 Pages) Rohm – DVD-Audio Reference Clock Generator for Audio/Video Appliance | |||
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âExample of application circuit
âBU2285FV
0.1uF
16.9344MHz
0.1uF
0.1uF
OPEN:48.0kHz type
L :44.1kHz type
36.8640MHz
or 33.8688MHz
1:VDD1
2:VSS1
3:CLK16M
4:AVSS
5:AVDD
6:AVDD
7:AVSS
8:XTALIN
9:XTALOUT
10:NC
11:CTRLA
12:CLKA
Fig.85
24:CLK33M
23:CTRLB
22:CLK54M
21:OE
20:CLKDAC
19:DVDD
18:DVSS
17:DVSS
16:CLK27M
15:VDD2
14:VSS2
13:CLKB
33.8688MHz
OPEN:27.0000MHz
L
:13.5000MHz
54.0000MHz
OPEN:Enable
L :Disable
27.0000MHz
or 13.5000MHz
0.1uF
27.0000MHz
0.1uF
18.4320MHz
or 16.9344MHz
Pin function
PIN No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
PIN name
VDD1
VSS1
CLK16M
AVSS
AVDD
AVDD
AVSS
XTALIN
XTALOUT
NC
CTRLA
CLKA
CLKB
VSS2
VDD2
CLK27M
DVSS
DVSS
DVDD
CLKDAC
OE
CLK54M
CTRLB
CLK33M
PIN function
33MHz system power supply
33MHz system GND
16.9344MHz output
Analog GND
Analog power supply
Analog power supply
Analog GND
Crystal input terminal
Crystal output terminal
NC
CLKA or B output selection (with pull-up)
CTRLA=OPEN:36.8640MHz, CTRLA=L:33.8688MHz
CTRLA=OPEN:18.4320MHz, CTRLA=L:16.9344MHz
CLKA, B GND
CLKA, B power supply
27.0000MHz output
Digital GND
Digital GND
Digital power supply
CTRLB=OPEN:27.0000MHz, CTRLB=L:13.5000MHz
Output enable (with pull-up), OPEN:enable, L:disable
54.0000MHz output
CLKDAC output selection(with pull-up)
33.8688MHz output
Note) Basically, mount ICs to the printed circuit board for use. (If the ICs are not mounted to the printed circuit board, the characteristics of ICs
may not be fully demonstrated.)
Mount 0.1ïF capacitors in the vicinity of the IC PINs between 1PIN (VDD1) and 2PIN (VSS1), 4PIN (AVSS) and 5PIN (AVDD), 6PIN (AVDD) and
7PIN (AVSS), 14PIN (VSS2) and 15PIN (VDD2), and 17PIN/18PIN (DVSS) and 19PIN (DVDD), respectively.
Depending on the conditions of the printed circuit board, 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 BU2285FV from the printed circuit board or to insert
a capacitor (of 1ï or less), which bypasses high frequency desired, between the power supply and the GND terminal.
13/16
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