BU2385KN Datasheet, PDF (4/5 Pages) Rohm – Clock generator for digital still camera

Multimedia ICs
BU2385KN
zElectrical characteristics (Unless otherwise noted, Ta=25°C, V_CC=3.3V)
While crystal shows 28.636363MHz, XTAL_SEL=H, in case of 14.31818MHz, TXAL_SEL=L
Parameter
Symbol Min.
Typ.
Max. Unit
Power supply current
IDD
-
40
50
mA No load
Conditions
output frequency
CLK1 FS2:H FS3:H
Fclk1-1
−
96.016044
−
FS2:H FS3:L
Fclk1-2
−
71.877274
−
FS2:L FS3:L
Fclk1-3
−
114.54546
−
FS2:L FS3:H
Fclk1-4
−
90.314686
−
CLK2 FS2:L FS3:L
Fclk2-1
−
96.016044
−
FS2,3:HL LH HH Fclk2-2
−
48.008022
−
REFCLK FS1:H
Fref1-1
−
14.318182
−
FS1:L
Fref1-2
−
17.734450
−
Duty1 at under 100MHz
Duty1
45
50
55
MHz
MHz
MHz
MHz
MHz
MHz
%
Xtal _* (228/17)/2
Xtal _* (251/25)/2
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
Duty2 at upper 100MHz
Duty2
−
50
−
% Measured at 1/2VDD
Rise time
Tr
−
2.5
−
nsec Time between 0.2VDD and 0.8VDD
Fall time
Tf
−
2.5
−
nsec Time between 0.2VDD and 0.8VDD
Period Jitter 1σ
P-J1σ
−
30
−
psec ∗1
Period Jitter MIN-MAX
P-J
MINMAX
−
180
−
psec ∗2
Output Lock time
Tlock
−
−
1
msec ∗3
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
48.008022MHz
96.016044MHz
AVDD
AVDD
AVSS
XIN
XOUT
BU2385KN
QFN−20
VDD1
VDD1
VSS1
CLK2ON
CLK1_OUT
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.
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