ROHM BU2385KN

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.
zExternal dimensions (Unit : mm)
1.1+
− 0.15
0.6 +0.15
−0.3
3−
4.2+
−0.1
4.0+
−0.1
11
10
16
6
20
1
0.
20
−+0
.
1
+
−0 0.2
.4
4.2+
−0.1
4.0+
−0.1
5
25
.
+−0
35
0.
0.
zFeatures
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
5
0.20+
−0.05
0.05 M
0.2+
−0.05
0.5
12
12
0.01+0.03
−0.007
0.6+
−0.1
0.8+
−0.15
zApplications
Digital still camera
0.05
QFN20V
zAbsolute maximum ratings (Ta=25°C)
Symbol
Limits
Unit
Applied voltage
Parameter
VDD
−0.5 to +7.0
V
Input voltage
VIN
−0.3 to VDD+0.3
V
Storage temperature range
Tstg
−30 to +125
C
Pd
530
mW
Power dissipation
∗ 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.
zRecommended operating conditions (Ta=25°C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
VDD
3.0
−
3.6
V
Input H voltage range
VIH
0.8VDD
−
VDD
V
V
Input L voltage range
Operation temperature range
Output maximum load
VIL
0.0
−
0.2VDD
Topr
−5
−
+70
C
CL
−
−
15
pF
1/4
BU2385KN
Multimedia ICs
TEST2
REF_CLK
VDD2
VSS2
CLK2OUT
zBlock diagram
20
19
18
17
16
AVDD
1
15 VDD1
AVDD
2
14 VDD1
AVSS
3
XIN
4
12 CKL2ON
XOUT
5
11 CLK1_OUT
Back View
6
7
8
9
10
TEST1
XTAL_SEL
FS3
FS2
FS1
13 VSS1
zExplanation for terminal function
PIN No.
PIN NAME
Function
1
AVDD
Analog VDD
2
AVDD
Analog VDD
3
AVSS
Analog GND
4
XIN
Standard crystal input
5
XOUT
Standard crystal output
6
TEST 1
Input for test mode
(normally open)
7
XTAL_SEL
Crystal select
H : 28.636363MHz
8
FS3
CLK1,2 output select
with pull up
9
FS2
CLK1,2 output select
with pull up
10
FS1
REFCLK output select
with pull up
11
CLK1OUT
71.877274M / 90.314686M /
96.016044M / 114.54546M clock output
12
CLK2ON
CLK2 output control
H : enable
L : disable
13
VSS 1
GND for CLK 1, 2 clock output and Logic circuit
14
VDD 1
VDD for CLK 1, 2,clock output and Logic circuit
15
VDD 1
VDD for CLK 1, 2,clock output and Logic circuit
16
CLK2OUT
96.016044M / 48.008022M clock output
17
VSS 2
REF_CLK GND
18
VDD 2
REF_CLK VDD
19
REF_CLK
14.318182M / 17.734450M clock output
20
TEST2
Input for test mode
(normally open)
with pull−down
with pull up
L : 14.318182MHz
with pull up
with pull−down
2/4
BU2385KN
Multimedia ICs
zPIN Input / Output equivalent circuit
PIN No.
Equival circuit
Input PIN
7, 8, 9, 10,
12
with pull−up
(6 : TEST1, 20 : TEST2
with pull down)
To inside IC
Output PIN
11, 16, 19
From inside IC
Crystal PIN
4, 5
XTALIN
XTALOUT
To inside IC
3/4
BU2385KN
Multimedia ICs
zElectrical characteristics (Unless otherwise noted, Ta=25°C, VCC=3.3V)
While crystal shows 28.636363MHz, XTAL_SEL=H, in case of 14.31818MHz, TXAL_SEL=L
Parameter
Symbol
IDD
Min.
-
Typ.
40
Max.
50
CLK1 FS2:H FS3:H
Fclk1-1
−
96.016044
−
FS2:H FS3:L
Fclk1-2
−
71.877274
−
FS2:L FS3:L
Fclk1-3
−
−
MHz
Fclk1-4
−
−
Xtal * (224/14)/2
FS2:L FS3:H
114.54546
90.314686
Fclk2-1
−
96.016044
−
Xtal * (164/13)/2
CLK2 FS2:L FS3:L
MHz
MHz
Fclk2-2
−
−
MHz
Fref1-1
−
−
Xtal * (228/17)/4
REFCLK FS1:H
48.008022
14.318182
MHz
FS1:L
Fref1-2
−
−
MHz
Crystal direct output
Xtal * (706/57)/10
Duty1 at under 100MHz
Duty1
45
17.734450
50
55
%
Measured at 1/2VDD
Duty2 at upper 100MHz
Duty2
−
50
−
%
Rise time
Tr
−
2.5
−
nsec
Measured at 1/2VDD
Time between 0.2VDD and 0.8VDD
Fall time
Tf
−
2.5
−
nsec
Time between 0.2VDD and 0.8VDD
P-J1σ
−
30
−
psec
∗1
P-J
MINMAX
−
180
−
psec
∗2
−
−
1
msec
∗3
Power supply current
Unit
mA
Conditions
No load
output frequency
FS2,3:HL LH HH
Period Jitter 1σ
Period Jitter MIN-MAX
Output Lock time
Tlock
Xtal * (228/17)/2
Xtal * (251/25)/2
Xtal * (228/17)/2
Note) When input frequency is 14.31818MHz, output frequency is above rated value.
∗1 Period Jitter 1σ
: 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.
zApplication circuit
14.318182MHz
17.734450MHz
CLK2OUT
VSS2
VDD2
REF_CLK
TEST2
48.008022MHz
96.016044MHz
AVDD
VDD1
AVDD
VDD1
BU2385KN
QFN−20
AVSS
VSS1
FS1
FS2
CLK1_OUT
FS3
XOUT
XTAL_SEL
CLK2ON
TEST1
TEST1
XIN
114.54546MHz
96.016044MHz
71.877274MHz
90.016044MHz
Note) BU2385KN is placed on the board normally.
A decoupling capacitor (0.1µF) 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.
4/4
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