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BU2385KN
Multimedia ICs
Clock generator for digital still camera
BU2385KN
BU2385KN is a clock generator IC that can generate multiple frequencies (clocks) from one oscillator. Excellent jitter characteristic is achieved through the built-in high-performance 3-channel PLL. High-quality sound and image equivalent to the oscillating module are the result of this feature. Clocks can be easily changed for other applications. The internal dividing control allows the frequency to be switched outside.
Applications Digital still camera
External dimensions (Unit : mm)
1.1+ 0.15 - 0.6 +0.15 -0.3
3-
Features 1) Multiple frequency clock signals can be generated by the built-in 3-channel PLL through connecting crystal oscillator. 2) QFN20V package 3) 3.3V single power supply 4) For crystal 14.318182MHz * 28.636363MHz 5) No need additional components. (BU2385KN have PLL loop filter in side).
15
4.2+0.1 - 4.0+0.1 -
11 10
0.
5
20 -+0 .
1
+ -0 0.2 .4
4.2+0.1 - 4.0+0.1 -
0.
16
1
5
0.5
0.2+0.05 -
0.20+0.05 -
0.05 M
12
12
QFN20V
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 -0.3 to VDD+0.3 -30 to +125 530 Unit V V C mW
An operation is not guaranteed. In case it is used at Ta=25 C or more, 5.3mW is reduced at every 1 C. Radiation resistance design is not used. Power dissipation is measured when BU2385KN is placed in the board.
Recommended operating conditions (Ta=25C)
Parameter Supply voltage Input H voltage range Input L voltage range Operation temperature range Output maximum load Symbol VDD VIH VIL Topr CL Min. 3.0 0.8VDD 0.0 -5 - Typ. - - - - - Max. 3.6 VDD 0.2VDD +70 15 Unit V V V C pF
0.01+0.03 -0.007 0.6+0.1 - 0.8+0.15 -
. +-0 35 25 0.
20
6
0.05
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BU2385KN
Multimedia ICs
Block diagram
REF_CLK TEST2 CLK2OUT VDD2 VSS2
20
19
18
17
16
AVDD AVDD AVSS XIN XOUT
1 2 3 4 5
15 VDD1 14 VDD1
Back View
13 VSS1 12 CKL2ON 11 CLK1_OUT
6
TEST1
7
XTAL_SEL
8
FS3
9
FS2
10
FS1
Function with pull-down with pull up L : 14.318182MHz with pull up with pull up with pull up
Explanation for terminal function
PIN No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PIN NAME AVDD AVDD AVSS XIN XOUT TEST 1 XTAL_SEL FS3 FS2 FS1 CLK1OUT CLK2ON VSS 1 VDD 1 VDD 1 CLK2OUT VSS 2 VDD 2 REF_CLK TEST2 Analog VDD Analog VDD Analog GND Standard crystal input Standard crystal output Input for test mode (normally open) Crystal select H : 28.636363MHz CLK1,2 output select CLK1,2 output select REFCLK output select
71.877274M / 90.314686M / 96.016044M / 114.54546M clock output CLK2 output control H : enable L : disable with pull up
GND for CLK 1, 2 clock output and Logic circuit VDD for CLK 1, 2,clock output and Logic circuit VDD for CLK 1, 2,clock output and Logic circuit 96.016044M / 48.008022M clock output REF_CLK GND REF_CLK VDD 14.318182M / 17.734450M clock output Input for test mode (normally open) with pull-down
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BU2385KN
Multimedia ICs
PIN Input / Output equivalent circuit
PIN No. Input PIN 7, 8, 9, 10, 12 with pull-up (6 : TEST1, 20 : TEST2 with pull down)
To inside IC
Equival circuit
Output PIN 11, 16, 19
From inside IC
Crystal PIN 4, 5
XTALIN
XTALOUT To inside IC
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BU2385KN
Multimedia ICs
Electrical characteristics (Unless otherwise noted, Ta=25C, VCC=3.3V)
While crystal shows 28.636363MHz, XTAL_SEL=H, in case of 14.31818MHz, TXAL_SEL=L
Parameter Power supply current output frequency CLK1 FS2:H FS3:H FS2:H FS3:L FS2:L FS3:L FS2:L FS3:H CLK2 FS2:L FS3:L FS2,3:HL LH HH REFCLK FS1:H FS1:L Duty1 at under 100MHz Duty2 at upper 100MHz Rise time Fall time Period Jitter 1 Period Jitter MIN-MAX Output Lock time
Symbol IDD Fclk1-1 Fclk1-2 Fclk1-3 Fclk1-4 Fclk2-1 Fclk2-2 Fref1-1 Fref1-2 Duty1 Duty2 Tr Tf P-J1
P-J MINMAX
Min. - - - - - - - - 45 - - - - - -
Typ. 40 96.016044 71.877274 114.54546 90.314686 96.016044 48.008022 14.318182 17.734450 50 50 2.5 2.5 30 180 -
Max. 50 - - - - - - - - 55 - - - - - 1
Unit mA
Conditions No load Xtal * (228/17)/2 Xtal * (251/25)/2
MHz MHz MHz MHz MHz MHz % % nsec nsec psec psec msec
Xtal * (224/14)/2 Xtal * (164/13)/2 Xtal * (228/17)/2 Xtal * (228/17)/4 Crystal direct output Xtal * (706/57)/10 Measured at 1/2VDD Measured at 1/2VDD Time between 0.2VDD and 0.8VDD Time between 0.2VDD and 0.8VDD 1 2 3
Tlock
1 Period Jitter 1 : This value is the standard deviation of an output period when using Time Interval Analyzer with 10,000 sampling. 2 Period Jitter MIN-MAX : This value is the max range of an output period when using Time Interval Analyzer with 10,000 sampling. 3 Output Lock time : Time between voltage supply leads to 3.0V and output clock gets stable.
Note) When input frequency is 14.31818MHz, output frequency is above rated value.
Application circuit
14.318182MHz 17.734450MHz 48.008022MHz 96.016044MHz
CLK2OUT
VDD1 VDD1 VSS1 CLK2ON CLK1_OUT
REF_CLK
TEST2
VDD2
AVDD AVDD AVSS XIN XOUT
BU2385KN QFN-20
VSS2
XTAL_SEL
TEST1 TEST1
114.54546MHz 96.016044MHz 71.877274MHz 90.016044MHz
FS3
FS2
Note) BU2385KN is placed on the board normally. A decoupling capacitor (0.1F) needs to be placed between Pin1,2 and Pin3, Pin13 and Pin14,15, Pin17 and Pin18. The decoupling capacitor is as close to the above pins as possible.
FS1
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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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