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BU2285FV
Multimedia ICs
Clock generator IC
BU2285FV
BU2285FV is an IC which produces plural clocks required for a DVD system from an external crystal oscillator and a built-in 2-channel PLL. Seven kinds of signals such as 54MHz, 27MHz and 13.5 MHz for a video clock, 33.8688MHz and 16.9342MHz for a CD clock, 33.864MHz and 18.432MHz for a DVD clock can be outputted with low jitter and high S/N.
Applications DVD System
External dimensions (Unit : mm)
7.8 0.2 24 13
Features 1) Available with seven output clock signals 2) All output low jitter (No load 30ps) High S/N (More than 50dB) 3) No need for additional components (BU2285FV has a PLL loop filter inside) 4) 3.3V signal power supply
7.6 0.3 5.6 0.2
1
12
1.15 0.1 0.1
0.15 0.1
0.65
0.22 0.1 0.1
SSOP-B24
Absolute maximum ratings (Ta=25C)
Parameter Applied voltage Input voltage Storage temperature range Power dissipation Symbol VDD VIN Tstg Pd Limits -0.5 to +7.0 -0.5 to VDD+0.5 -30 to +125 630 Unit V V
C
mW
An operation is not guaranteed. In case it is used at Ta=25C or more, 6.3mW is reduced at every 1C. Radiation resistance design is not used. Power dissipation is measured when BU2285FV is placed on the board.
Recommended operating conditions (Ta=25C)
Parameter Supply voltage Input "H" voltage range Input "L" voltage range Operating temperature range Output load Symbol VDD VIH VIL Topr CL Min. 3.0 0.8VDD 0 -5 - Typ. - - - - - Max. 3.6 VDD 0.2VDD 70 15 Unit V V V
C
pF
0.3Min.
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BU2285FV
Multimedia ICs
Block diagram
1/2 1 / 128 Phase Comparator 1 / 375 Low-pass filter 108MHz 1/8 L 36.864MHz CTRL B VCO 1/4 H 27MHz 54MHz
27MHz or 13.5MHz
1 / 40 Phase Comparator 1 / 147 Low-pass filter
VCO
1/4
33.8688MHz
135.4752MHz
1/8
16.9344MHz H : 36.864MHz or L : 33.8688MHz CTRL A H : 18.432MHz or L : 16.9344MHz
1/2 CTRL A
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BU2285FV
Multimedia ICs
Pin descriptions
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 Functions Digital VDD for (33.16) MHz clock output Digital GND for (33.16) MHz clock output 16.934MHz clock output Analog GND Analog VDD Analog VDD Analog GND Standard crystal input Standard crystal output No connection CLKA, CLKB select bit CTRLA=H:36.864MHz, CTRLA=L:33.8688MHz CTRLA=H:18.432MHz, CTRLA=L:16.9344MHz Digital GND for (CLKA, CLKB) clock output Digital VDD for (CLKA, CLKB) clock output 27MHz clock output Digital GND Digital GND Digital VDD CTRLB=H:27MHz, CTRLB=L:13.5MHz Output Enable (open : enable, L : disable) : with pull up 54MHz clock output CLKDAC select bit clock output
VDD 1
1
24
CLK33M
VSS 1
2
23
CTRLB
CLK16M
3
22
CLK54M
AVSS
4
21
OE
AVDD
5
20
CLKDAC
AVDD
6
19
DVDD
AVSS
7
18
DVSS
XTALIN
8
17
DVSS
XTALOUT
9
16
CLK27M
NC
10
15
VDD2
CTRLA
11
14
VSS2
CLKA
12
13
CLKB
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BU2285FV
Multimedia ICs
Input output circuits
Pin No. Equivalent circuit
Input Pin
11,21,23
To inside IC
pull_up resistance about 50k
Output Pin
3,12,13,16, 20,22,24
From inside IC
Crystal Pin
8,9
XTALIN
XTALOUT
To inside IC
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BU2285FV
Multimedia ICs
Electrical characteristics (Unless specified otherwise Ta=25C, VCC=3.3V, crystal frequency=36.864MHz)
Parameter Output "L" voltage Output "H" voltage Power supply current CLK54M CLK27M CLKDAC CLK33M CLK16M CLKA Symbol VOL VOH IDD CLK54M CLK27M CLKDAC_H CLKDAC_L CLK33M CLK16M CLKA_H CLKA_L CLKB Duty Jitter1 Jitter2 Rise time Fall time Output LOCK time CLKB_H CLKB_L Duty Jstd1 Jstd2 tr tf tLOCK Min. - 2.4 - - - - - - - - - - - 45 - - - - - Typ. - - 30 54 27 27 13.5 33.8688 16.9344 36.864 33.864 18.432 16.9344 50 100 400 2.5 2.5 - Max. 0.4 - 50 - - - - - - - - - - 55 - - - - 1 Unit V V mA MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz % psec psec nsec nsec msec IOL=4.0mA IOH=-4.0mA No load XTAL x 375 / 128 / 2 XTAL x 375 / 128 / 4 CTRLB=H, XTAL x 375 / 128 / 4 CTRLB=L, XTAL x 375 / 128 / 8 XTAL x 147 / 40 / 4 XTAL x 147 / 40 / 8 CTRLA=H, XTAL output CTRLA=L, XTAL x 147 / 40 / 4 CTRLA=H, XTAL / 2 output CTRLA=L, XTAL x 147 / 40 / 8 1/2VDD test Short term itter 1sigma Min.- Max. level Time between 0.2VDD to 0.8VDD Time between 0.2VDD to 0.8VDD Conditions
Jitter is meen value when using Time Interval Analyzer with 10,000 sampling. Time between voltage supply lead to 3.0V and output clock gets stable. Start up time of power supply sources satisfy this rated value at every time, case.
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BU2285FV
Multimedia ICs
Application example
1
0.1F
VDD 1
CLK33M
24
33.8688MHz
2
VSS 1
CTRLB
23
L or NC (pull-up)
16.9344MHz
3
CLK16M
CLK54M
22
54MHz
4
0.1F
AVSS
OE
21
L or NC (pull-up)
5
AVDD
CLKDAC
20
13.5MHz or 27MHz
BU2285FV
6
0.1F
AVDD
DVDD
19
0.1F
7
AVSS
DVSS
18
8
XTALIN
DVSS
17
9
XTALOUT
CLK27M
16
27MHz
10
NC
VDD2
15
0.1F
L or NC(pull-up) 33.8688MHz or 36.864MHz
11
CTRLA
VSS2
14
12
CLKA
CLKB
13
16.9344MHz or 18.432MHz
Operating notes The BU2285FV is basically placed on the board. Decoupling capacitance (0.1F) need to be placed between Pin6 (AVDD) and Pin7 (AVSS). Also Decoupling capacitance (0.1F) need to be placed between Pin1 (VDD1) and Pin2 (VSS1), Pin4 (AVSS) and Pin5 (AVDD), Pin14 (VSS2) and Pin15 (VDD2), Pin18 (DVSS) and Pin19 (DVDD). To obtain accurate frequency , capacitance( pF) need to be placed between Pin8 (XTALIN) and Pin7 (AGND), Pin9 (XTALOUT) and Pin7 (AGND). Tantalum capacitance (10 to 100F), ferrite beads may need to be placed to prevent power supply drop in certain boards case. To reduce high frequency noise, selected bypass capacitors (1 at problem high frequency) maybe used for power pin as close to BU2285FV as possible.
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Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0

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