BU3087FV-E Datasheet, PDF (5/26 Pages) Rohm – Built in VCXO,Spread-Spectrum Clock Generator

BU3087FV
Datasheet
●Electrical Characteristics
DC Characteristics
(VDD=3.3V, Ta=25°C, Crystal Frequency=27.000000MHz, at No Load, unless otherwise specified）
Parameter
Output H voltage
Symbol
VOH
Min.
VDD-0.4
Limit
Typ.
－
Max.
－
Unit
Conditions
V IOH=4.0mA
Output L voltage
Operating
Circuit current
Input H current 1
Input H current 2
Input H current 3
Input L current 1
Input L current 2
VOL
IDD
IupH
IdnH
IdirH
IupL
IdnL
－
－
-1.5
35.0
-1.5
-105.5
-1.5
－
45.0
－
70.0
－
-70.0
－
0.4
58.0
1.5
105.5
1.5
-35.0
1.5
V IOL=4.0mA
mA
Output no load,
±0.50% Modulation
PDB, SSON, MODSEL1 Terminal
μA
VIH=VDD
μA MODSEL2, TEST Terminal,VIH=VDD
μA VCTRL Terminal,VIH=VDD
μA ^{PDB, SSON, MODSEL1 Terminal}
VIL=0.0V
μA MODSEL2, TEST Terminal,VIL=0.0V
Input L current 3
IdirL
-1.5
－
1.5
μA VCTRL Terminal,VIL=0.0V
CLKOUT
CLKOUT 74.248144 74.250000 74.251856 MHz VCTRL=1/2VDD
Crystal Pullability
fp
±80
±105
±130
ppm 0≦VCTRL≦VDD ^※1
Spread-Spectrum
Modulation Frequency
Fmod
32.5
34.5
36.5
kHz
Triangular Modulation,
Independently of Modulation Rate
※1 _{This is a guarantee with only IC. It is finished with confirmation to operate with Crystal (DSX321G・8pF load) made in DAISHINKU CORP.}
AC Characteristics
(VDD=3.3V, Ta=25°C, Crystal Frequency=27.000000MHz, Output load=15pF, unless otherwise specified）
Following the table cannot test directly on characteristic when shipment, so it is a design guarantee.
Parameter
Duty
Jitter 1σ
Jitter P-P
Jitter
Cycle-to-Cycle
Rise Time
Symbol
Min.
Duty
45
JsSD
－
JsABS
－
JsCyCy
－
Tr
－
Limit
Typ.
50
35
180
180
1.2
Max.
55
－
－
－
－
Unit
Conditions
%
psec
psec
psec
nsec
Measured at 1/2VDD
Period Jitter 1σ^※2,
in Spread-Spectrum OFF
Period Jitter MIN-MAX value^※2,
in Spread-Spectrum OFF
Cycle-to-Cycle Jitter,
In ±0.50% Modulation
Time between 0.2VDD and 0.8VDD
Fall Time
Lock Up Time
Tf
－
0.7
－
nsec Time between 0.8VDD and 0.2VDD
Tlock
－
－
1
msec ^※3
※２ _{Jitter means center value when using Japan Tektronix : TDS7104 Digital Phosphor Oscilloscope.}
※３ _{Time between voltage supply leads to 3.135V and output clock gets stable.}
●Spread-Spectrum Modulation Waveform
Modulation Waveform is triangular. Modulation Rate is selectable among ±0.25%／±0.50%／±0.75%／±1.00%.
In addition, Modulation Frequency is 34.5kHz without depending on Modulation Rate.
( Figure 4 shows ±0.50% Modulation Waveform. )
74.250000MHz x (100 + 0.5)%
74.250000MHz
74.250000MHz x (100 - 0.5)%
Modulation Frequency； 34.5kHz
Figure 4. Spread-Spectrum Modulation Waveform
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TSZ22111・15・001
5/23
TSZ02201-0E3E0J500040-1-2
17.AUG.2012 Rev.001