BU2285FV [ROHM]
Clock generator IC; 时钟发生器IC
| 型号： | BU2285FV |
| 厂家： | 
ROHM |
| 描述： | Clock generator IC |
| 文件： | 总7页 (文件大小：65K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
zApplications
zExternal dimensions (Unit : mm)
DVD System
7.8 ± 0.2
24
13
zFeatures
1) Available with seven output clock signals
2) All output low jitter (No load 30ps)
High S/N (More than 50dB)
1
12
±
0.15 0.1
0.65
0.22 ± 0.1
3) No need for additional components
(BU2285FV has a PLL loop filter inside)
4) 3.3V signal power supply
0.1
SSOP-B24
zAbsolute maximum ratings (Ta=25°C)
Parameter
Applied voltage
Symbol
Limits
−0.5 to +7.0
−0.5 to VDD+0.5
−30 to +125
630
Unit
V
VDD
Input voltage
V
IN
V
Storage temperature range
Tstg
Pd
°C
mW
Power dissipation
An operation is not guaranteed.
In case it is used at Ta=25°C or more, 6.3mW is reduced at every 1°C.
Radiation resistance design is not used.
Power dissipation is measured when BU2285FV is placed on the board.
zRecommended operating conditions (Ta=25°C)
Parameter
Symbol
Min.
Typ.
−
Max.
3.6
Unit
Supply voltage
V
DD
IH
IL
3.0
V
V
Input "H" voltage range
Input "L" voltage range
Operating temperature range
Output load
V
0.8VDD
0
−
VDD
V
−
0.2VDD
70
V
Topr
−5
−
°C
pF
CL
−
−
15
1/6
BU2285FV
Multimedia ICs
zBlock diagram
54MHz
27MHz
1 / 2
1 / 128
VCO
Phase
Comparator
Low-pass
filter
1 / 4
1 / 8
108MHz
1 / 375
27MHz
or
13.5MHz
H
L
36.864MHz
CTRL B
1 / 40
33.8688MHz
16.9344MHz
1 / 4
1 / 8
VCO
Phase
Comparator
Low-pass
filter
135.4752MHz
1 / 147
H : 36.864MHz
or
L : 33.8688MHz
CTRL A
CTRL A
H : 18.432MHz
or
L : 16.9344MHz
1 / 2
2/6
BU2285FV
Multimedia ICs
zPin descriptions
Functions
Digital VDD for (33.16) MHz clock output
Digital GND for (33.16) MHz clock output
16.934MHz clock output
Analog GND
Pin No.
Pin name
1
2
VDD1
V
SS
1
3
CLK16M
AVSS
4
5
AVDD
Analog VDD
6
AVDD
Analog VDD
7
AVSS
Analog GND
8
XTALIN
XTALOUT
NC
Standard crystal input
Standard crystal output
No connection
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
CLKA, CLKB select bit
CTRLA
CLKA
CLKB
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
VSS
2
VDD2
CLK27M
DVSS
Digital GND
DVSS
Digital GND
DVDD
Digital VDD
CTRLB=H:27MHz, CTRLB=L:13.5MHz
Output Enable (open : enable, L : disable) : with pull up
54MHz clock output
CLKDAC
OE
CLK54M
CTRLB
CLK33M
CLKDAC select bit
clock output
VDD 1
1
2
3
4
5
6
7
8
9
24 CLK33M
23 CTRLB
22 CLK54M
21 OE
VSS 1
CLK16M
AVSS
AVDD
20 CLKDAC
19 DVDD
18 DVSS
17 DVSS
16 CLK27M
15 VDD2
14 VSS2
AVDD
AVSS
XTALIN
XTALOUT
NC 10
CTRLA 11
CLKA 12
13 CLKB
3/6
BU2285FV
Multimedia ICs
zInput output circuits
Pin No.
Equivalent circuit
Input Pin
11,21,23
To inside IC
pull_up resistance
about 50kΩ
Output Pin
3,12,13,16,
20,22,24
From inside IC
Crystal Pin
8,9
XTALIN
XTALOUT
To inside IC
4/6
BU2285FV
Multimedia ICs
zElectrical characteristics (Unless specified otherwise Ta=25°C, VCC=3.3V, crystal frequency=36.864MHz)
Parameter
Output "L" voltage
Output "H" voltage
Power supply current
CLK54M
Symbol
VOL
Min.
−
Typ.
−
Max.
0.4
−
Unit
V
Conditions
IOL=4.0mA
IOH=−4.0mA
No load
VOH
2.4
−
−
V
IDD
30
50
−
mA
XTAL × 375 / 128 / 2
CLK54M
CLK27M
CLKDAC_H
CLKDAC_L
CLK33M
CLK16M
CLKA_H
CLKA_L
CLKB_H
CLKB_L
Duty
−
54
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
%
XTAL × 375 / 128 / 4
CLK27M
−
27
−
CTRLB=H, XTAL × 375 / 128 / 4
CTRLB=L, XTAL × 375 / 128 / 8
XTAL × 147 / 40 / 4
−
27
−
CLKDAC
−
13.5
33.8688
16.9344
36.864
33.864
18.432
16.9344
50
−
CLK33M
CLK16M
−
−
XTAL × 147 / 40 / 8
−
−
CTRLA=H, XTAL output
CTRLA=L, XTAL × 147 / 40 / 4
CTRLA=H, XTAL / 2 output
CTRLA=L, XTAL × 147 / 40 / 8
1/2VDD test
−
−
CLKA
CLKB
−
−
−
−
−
−
Duty
45
−
55
−
Jitter1
Short term itter 1sigma
Min.− Max. level
Jstd1
100
psec
psec
nsec
nsec
msec
Jitter2
Jstd2
−
400
−
Rise time
Fall time
Output LOCK time
Time between 0.2VDD to 0.8
V
V
DD
DD
tr
−
2.5
−
Time between 0.2VDD to 0.8
tf
−
2.5
−
tLOCK
−
−
1
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.
5/6
BU2285FV
Multimedia ICs
zApplication example
1
2
3
4
5
6
7
8
9
VDD 1
VSS 1
CLK33M 24
CTRLB 23
CLK54M 22
OE 21
33.8688MHz
0.1µF
L or NC (pull-up)
54MHz
CLK16M
AVSS
16.9344MHz
L or NC (pull-up)
0.1µF
13.5MHz or 27MHz
AVDD
CLKDAC 20
DVDD 19
DVSS 18
DVSS 17
CLK27M 16
VDD2 15
VSS2 14
AVDD
0.1µF
0.1µF
AVSS
XTALIN
XTALOUT
27MHz
10 NC
0.1µF
L or NC(pull-up)
11 CTRLA
12 CLKA
33.8688MHz or
36.864MHz
CLKB 13
16.9344MHz or
18.432MHz
zOperating notes
The BU2285FV is basically placed on the board.
Decoupling capacitance (0.1µF) need to be placed between Pin6 (AVDD) and Pin7 (AVSS).
Also Decoupling capacitance (0.1µF) 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 100µF), ferrite beads may need to be placed to prevent power supply drop in certain boards
case.
To reduce high frequency noise, selected bypass capacitors (≤1Ω at problem high frequency) maybe used for power pin
as close to BU2285FV as possible.
6/6
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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