BU2280FV_15 Datasheet, PDF (3/25 Pages) Rohm – Clock Generator for Audio/Video Equipment

BU2280FV
Pin Descriptions
Pin No.
Pin Name
1
VDD1
2
VSS1
3
CLK27M1
4
CLK27M2
5
AVDD
6
AVDD
7
AVSS
8
XTALIN
9
XTALOUT
10
VSS2
11
VDD2
12
CLK33M
13
VSS2
14
VDD2
15
CLK512FS2
16
CLK512FS1
17
DVSS
18
DVSS
19
DVDD
20
CLK384FS
21
OE
22
CLK768FS
23
CTRLFS
24
CLK27M3
Pin Function
Power supply for 27MHz
GND for 27MHz
27.0000MHz Clock output terminal 1
27.0000MHz Clock output terminal 2
Power supply for Analog block
Power supply for Analog block
GND for Analog block
Crystal input terminal
Crystal output terminal
GND for 33MHz
Power supply for 33MHz
33.8688MHz Clock output terminal
GND for 33MHz
Power supply for 33MHz
CTRLFS=OPEN:24.5760MHz, CTRLFS=L:22.5792MHz
CTRLFS=OPEN:24.5760MHz, CTRLFS=L:22.5792MHz
GND for Digital block
GND for Digital block
Power supply for Digital block
CTRLFS=OPEN:18.4320MHz, CTRLFS=L:16.9344MHz
Output enable (with pull-up), OPEN: enable, L:disable
CTRLFS=OPEN:36.8640MHz, CTRLFS=L:33.8688MHz
PIN 15, 16, 20, 22 output selection (with pull-up)
OPEN:24.5760MHz(PIN 15, PIN 16), 18.4320MHz(PIN 20), 36.8640MHz(PIN 22)
L:22.5792MHz(PIN 15, PIN 16), 16.9344MHz(PIN 20), 33.8688MHz(PIN 22)
27.0000MHz Clock output terminal 3
(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 realized.)
Mount 0.1µF capacitors in the vicinity of the IC PINs between PIN 1 (VDD1) and PIN 2 (VSS1), PIN 5-PIN 6 (AVDD) and PIN 7 (AVSS), PIN 10 (VSS2)
and PIN 11 (VDD2), PIN 13(VSS2) and PIN 14 (VDD2), PIN 17-PIN 18 (DVSS) and PIN 19(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 to be supplied to the BU2280FV from the board or to insert a capacitor (of not
more than 1), which bypasses high frequency desired, between the power supply and the GND.
Block Diagram
1/4
XTALIN=27.0000MHz
8:XTALIN
9:XTALOUT
XTAL
OSC
PLL1
1/6
1/8
1/4
PLL2
1/6
1/8
21:OE
23:CTRLFS
(FSEL=OPEN:48.0kHz type
FSEL=L :44.1kHz type)
3:CLK27M1
(27.0000MHz)
4:CLK27M2
(27.0000MHz)
24:CLK27M3
(27.0000MHz)
12:CLK33M
(33.8688MHz)
22:CLK768FS
(CTRLFS=OPEN:36.8640MHz
CTRLFS=L :33.8688MHz)
16:CLK512FS1
(CTRLFS=OPEN:24.5760MHz
CTRLFS=L :22.5792MHz)
15:CLK512FS2
(CTRLFS=OPEN:24.5760MHz
CTRLFS=L :22.5792MHz)
20:CLK384FS
(CTRLFS=OPEN:18.4320MHz
CTRLFS=L :16.9344MHz)
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TSZ22111・15・001
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TSZ02201-0E3E0J500660-1-2
04.Nov.2015 Rev.001