Datasheet
Built in VCXO,
Spread-Spectrum Clock Generator
BU3087FV
●Description
BU3087FV has built in VCXO that is necessary for the
Digital-TV signal reception.
Connecting 27MHz crystal oscillator generates clock
signals to 74.25MHz for Hi-Vision.
BU3087FV has built in Spread-Spectrum function too.
●Features
3225 size crystal is usable
ON / OFF of Spread-Spectrum is selectable
Four kinds of Modulation-Rate is selectable
（±0.25%
/
±0.50%
/
±0.75%
/
±1.00%）
Triangular Modulation
●Applications
Digital-TV, STB, TV-Tuner
●Key
Specifications
Crystal Pullability
Modulation Frequency
Cycle-to-Cycle Jitter
Operating Current
Operating Temperature
●Package
SSOP-B16
±105ppm
(Typ.)
34.5kHz (Typ.)
180psec (Typ.)
45mA (Typ.)
-10℃ to +75℃
(Typ.)
(Typ.)
(Max.)
5.00mm x 6.40mm x 1.35mm
SSOP-B16
●Typical
Application Circuit
3.3V (Typ.)
CL
27MHz Crystal
CL
RD
XIN
AVDD1
0.1μF
AVSS1
VCTRL
AVDD2
0.1μF
AVSS2
MODSEL1
MODSEL2
XOUT
PDB
CLKOUT
VDD
VSS
SSON
TEST
CLK27M
0.1μF
Figure 1. Typical Application Circuit
(Caution) CL and RD in Typical Application Circuit should be optimized as to using crystal and board condition.
○Product
structure：Silicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
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○This
product is not designed protection against radioactive rays
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TSZ02201-0E3E0J500040-1-2
17.AUG.2012 Rev.001
BU3087FV
●Block
Diagram
Datasheet
7:MODSEL1
with Pull-up
8:MODSEL2
with Pull-down
11:SSON
with Pull-up
10:TEST
with Pull-down
15:PDB
with Pull-up
Control
Logic
Spread-Spectrum
14:CLKOUT
PLL
4:VCTRL
1:XIN
VCXO
16:XOUT
9:CLK27M
Figure 2. Block Diagram
●Pin
Configuration
1
2
3
4
5
6
7
8
XIN
AVDD1
AVSS1
VCTRL
AVDD2
AVSS2
MODSEL1
MODSEL2
XOUT
PDB
CLKOUT
VDD
VSS
SSON
TEST
CLK27M
16
15
14
14
12
11
10
9
Figure 3.Pin Configuration (TOP VIEW)
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© 2012 ROHM Co., Ltd. All rights reserved.
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BU3087FV
●Pin
Function
PIN No.
1
2
3
4
5
6
7
PIN Name
XIN
AVDD1
AVSS1
VCTRL
AVDD2
AVSS2
MODSEL1
Crystal Input terminal
Power supply for VCXO
GND for VCXO
VCXO control input terminal
Power supply for PLL-Analog
GND for PLL-Analog
Spread-Spectrum Modulation control terminal
(Refer to Table of Spread-Spectrum Modulation)
with pull-up
Spread-Spectrum Modulation control terminal
(Refer to Table of Spread-Spectrum Modulation)
with pull-down
27.000000MHz Output
Test terminal, with pull-down
Function
Datasheet
8
9
10
11
12
13
14
15
16
MODSEL2
CLK27M
TEST
SSON
VSS
VDD
CLKOUT
PDB
XOUT
Spread-Spectrum ON／OFF choice（H：ON、L：OFF）, with pull-up
GND for PLL-Digital
Power supply for PLL-Digital
74.250000MHz Output
Power-down control terminal, with pull-up
Crystal Output terminal
●Table
of Spread-Spectrum Modulation（1Pin_XIN
input frequency =27.000000MHz）
In the case of 11Pin_SSON=H, outputs it according to the following table.
MODSEL2
L
L
H
H
MODSEL1
L
H
L
H
CLKOUT
74.250000MHz ±0.25% Modulation
74.250000MHz ±0.50% Modulation
74.250000MHz ±0.75% Modulation
74.250000MHz ±1.00% Modulation
In the case of 11Pin・SSON=L, outputs unmodulated clock.
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© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0E3E0J500040-1-2
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BU3087FV
●Absolute
Maximum Ratings
(Ta=25°C)
Parameter
Supply voltage
Input Voltage
Storage Temperature
range
Power dissipation
※
1
Datasheet
Symbol
VDD
VIN
Tstg
PD
Ratings
-0.3 to 4.0
-0.3 to VDD+0.3
-55 to 125
690
※
1
Unit
V
V
°C
mW
A measure value at mounting on 70mm x 70mm x 1.6mm glass epoxy substrate.
In the case of exceeding Ta=25°C, 6.9mW should be reduced per 1°C.
●Recommended
Operating Ratings
Parameter
Supply voltage
Input ”H” Voltage
Input ”L” Voltage
Operating Temperature
Frequency Control
Voltage
Output load
※
1
Symbol
VDD
VIH
VIL
topr
Vc
CL
Ratings
3.135 to 3.465
0.8VDD to VDD
0.0 to 0.2VDD
-10 to 75
0.0 to VDD
15 (MAX)
Unit
V
V
V
°C
V
pF
In case of Output load exceeds previous value , consideration should be adapted Rise Time and Fall Time for condition of use.
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BU3087FV
●Electrical
Characteristics
DC Characteristics
(VDD=3.3V, Ta=25°C, Crystal Frequency=27.000000MHz, at No Load, unless otherwise specified）
Parameter
Output H voltage
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
Input L current 3
CLKOUT
Crystal Pullability
Spread-Spectrum
Modulation Frequency
※
1
Datasheet
Symbol
VOH
VOL
IDD
IupH
IdnH
IdirH
IupL
IdnL
IdirL
Limit
Min.
VDD-0.4
－
－
-1.5
35.0
-1.5
-105.5
-1.5
-1.5
Typ.
－
－
45.0
－
70.0
－
-70.0
－
－
Max.
－
0.4
58.0
1.5
105.5
1.5
-35.0
1.5
1.5
Unit
V
V
mA
μA
μA
μA
μA
μA
μA
IOH=4.0mA
IOL=4.0mA
Conditions
Output no load,
±0.50% Modulation
PDB, SSON, MODSEL1 Terminal
VIH=VDD
MODSEL2, TEST Terminal,VIH=VDD
VCTRL Terminal,VIH=VDD
PDB, SSON, MODSEL1 Terminal
VIL=0.0V
MODSEL2, TEST Terminal,VIL=0.0V
VCTRL Terminal,VIL=0.0V
※
1
CLKOUT 74.248144 74.250000 74.251856
fp
Fmod
±80
32.5
±105
34.5
±130
36.5
MHz VCTRL=1/2VDD
ppm 0≦VCTRL≦VDD
kHz
Triangular Modulation,
Independently of Modulation Rate
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
Fall Time
Lock Up Time
※２
※３
Symbol
Duty
JsSD
JsABS
JsCyCy
Tr
Tf
Tlock
Limit
Min.
45
－
－
－
－
－
－
Typ.
50
35
180
180
1.2
0.7
－
Max.
55
－
－
－
－
－
1
Unit
%
psec
psec
psec
nsec
nsec
msec
Conditions
Measured at 1/2VDD
Period Jitter 1σ
※
,
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
Time between 0.8VDD and 0.2VDD
※
3
2
Jitter means center value when using Japan Tektronix : TDS7104 Digital Phosphor Oscilloscope.
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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© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0E3E0J500040-1-2
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