BU2365FV ROHM Co. Ltd., BU2365FV Datasheet

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BU2365FV

Manufacturer Part Number
BU2365FV
Description
Clock Generator With Built-in Vcxo
Manufacturer
ROHM Co. Ltd.
Datasheet
High-performance Clock Generator Series
Clock Generators
with built-in VCXO
for A/V Equipment
BU2365FV
●Description
●Features
●Applications
*1 Operation is not guaranteed.
*2 Reduce by 8.2mW/°C over 25°C
*3 This IC is not designed to be radiation-resistant.
*4 Power dissipation is measured when the IC is mounted to the printed circuit board.
Parameter
Supply voltage
Input voltage
Storage temperature range
Power dissipation
The ROHM Clock Generator is an IC allowing for the generation of multiple clocks by a single chip through the connection of a
single crystal oscillator. The BU2365FV incorporates the ROHM’s unique PLL technology to provide the generation of multiple
high C/N clocks necessary for the DVD recorder system. This Clock Generator has the built-in high-precision VCXO function
and allows for high-precision synchronization with DVD Video clocks. It also has a built-in buffer having high driving force and
allows the supply of multiple 27MHz Video clocks for the system, thus providing the reduced number of the system
components.
1) The unique PLL technology allows for the generation of high C/N clocks.
2) Built-in high precision VCXO, which is essential for the DVD recorder system
3) Built-in buffer having high driving force (Load capacity/output CL=50pF, 27MHz drive, 1×input / 2×outputs)
4) Built-in half pulse clock protection [HPC]
5) Built-in power down function, Icc=0 uA(typ.)
6) SSOP-B24 package
7) Single power supply of 3.3 V
DVD recorder
Absolute maximum ratings(Ta=25℃)
Symbol
TECHNICAL NOTE
VDD
Tstg
VIN
PD
-0.3~VDD+0.3
-0.3~7.0
-30~125
Limit
820
Unit
mW
Ver.B Oct.2005

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BU2365FV Summary of contents

Page 1

... The ROHM Clock Generator allowing for the generation of multiple clocks by a single chip through the connection of a single crystal oscillator. The BU2365FV incorporates the ROHM’s unique PLL technology to provide the generation of multiple high C/N clocks necessary for the DVD recorder system. This Clock Generator has the built-in high-precision VCXO function and allows for high-precision synchronization with DVD Video clocks ...

Page 2

Parameter Supply voltage Input H voltage Input L voltage Operating temperature Output load 22Pin / 19Pin CL_CLK768FS/384FS 13Pin , 14Pin CL_BUFOUT 18Pin / 24Pin CL_CLK512FS/54M ● Electrical characteristics VDD=3.3V, Ta=25℃, Crystal frequency (XTAL_IN)=27.000000MHz load, unless ...

Page 3

... The electrical characteristics shown above have been all evaluated with the use of the crystal oscillator NX5032GA (Spec. No. EXS00A-00278) manufactured by NIHON DEMPA KOGYO CO., LTD., under the conditions of Limiting resistance Rd=30Ω and Crystal oscillator load CL=10pF. Consequently, in order to use the BU2365FV, the specified crystal oscillator is recommended. ...

Page 4

Fig.3 33.8688MHz output waveform VDD=3.3V,CL=32pF 5.0nsec/div Fig.6 36.864MHz output waveform VDD=3.3V,CL=32pF 10.0nsec/div Fig.9 18.432MHz output waveform VDD=3.3V,CL=32pF 5.0nsec/div Fig.12 24.576MHz output waveform VDD=3.3V,CL=15pF 500psec/div Fig.4 33.8688MHz Period-Jitter VDD=3.3V,CL=32pF 500psec/div Fig.7 36.864MHz Period-Jitter VDD=3.3V,CL=32pF 500psec/div Fig.10 ...

Page 5

Fig.15 54MHz output waveform VDD=3.3V,CL=15pF 5.0nsec/div Fig.18 BUF_OUT(27MHz) output waveform VDD=3.3V,CL=50pF 5.0nsec/div Fig.21 VCXO_OUT(27MHz) output waveform VDD=3.3V,CL=4pF 5.0nsec/div Fig.24 Buffer skew output waveform VDD=3.3V,CL=50pF 500psec/div Fig.16 54MHz Period-Jitter VDD=3.3V,CL=15pF 500psec/div Fig.19 BUF_OUT(27MHz) Period-Jitter VDD=3.3V,CL=50pF 500psec/div ...

Page 6

Temperature and Supply voltage variations data VDD=2.9V 49 VDD=3.3V 48 VDD=3. - 100 Temperature:T [℃] Fig.27 33.8688MHz Temperature-Duty 100 90 80 ...

Page 7

Temperature and Supply voltage variations data VDD=3.3V 51 VDD=2.9V VDD=3. - Temperature : ℃ ] Fig.37 18.432MHz Temperature-Duty ...

Page 8

Temperature and Supply voltage variations data VDD=2.9V 51 VDD=3.3V 50 VDD=3. - 100 Temperature : ℃ ] Fig.47 54MHz ...

Page 9

... This data represents the central frequency as a deviation to the optimum frequency of 27.000000MHz. 100 -20 VDD=3.3V -40 -60 -80 -100 0 0.55 1.1 1.65 2.2 2.75 3.3 Control Voltage:Vc [V] Fig.64 27MHz VCXO Control voltage – Frequency data ●Reference data (BU2365FV consumption current - Temperature and Supply voltage variations data) 100 95 90 VDD=3.7V 85 VDD=3.3V 80 VDD=2. - ...

Page 10

Long Term Jitter data) This data represents Period-Jitter at the 1000th cycle. 2.0nsec/div Fig.67 33.8688MHz Long Term Jitter ●Reference data (Period-Jitter MIN-MAX This data represents the output load up to two times as high as the ...

Page 11

Pin assignment 3Pin:FSEL PLL1 7Pin:XTAL_IN 27.0000MHz VCXO PLL0 Crystal 8Pin:XTAL_OUT 10Pin:VCTRL PLL2 H:PLL ON L:PLL OFF 23Pin:OE 16Pin:BUF_IN (27MHz) Fig.77 Block diagram ●Pin function Pin No. Pin Name 1 VDD54M Power supply for CLK54M output 2 VSS54M GND ...

Page 12

... Output phase relation The Audio clocks (CLK768FS, CLK384FS, and CLK512FS) of the BU2365FV are designed to be out of the phase from each output in order to provide low jitter and noise levels. Generating CLK384FS (18.432 MHz): A two-phase clock is generated for CLK768FS (36.864 MHz): The CLK768FS1 and CLK768FS2 with the phase relation to the PLL2 output (VCO=147 ...

Page 13

Outline ●Equivalent circuit PIN No. Equivalent circuit of I/O 3,23 (With pull-up) 4 (With pull-down Fig.81 PIN No. 13,14, 18,19, 22,24 To the inside the ...

Page 14

... Depending on the conditions of the substrate, mount an additional electrolytic capacitor between the power supply and GND terminal. 7) For EMI protection effective to put ferrite beads in the origin of power supply to be fed to the BU2365FV from the substrate or to insert a capacitor (of 1Ω or less impedance), which bypasses high frequency desired, between the power supply and the GND terminal ...

Page 15

Use 1. Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage , temperature range of operating conditions, etc., can break down devices, thus making impossible to identify breaking mode such as a short ...

Page 16

Part No. Type SSOP-B24 <Dimension> 7.8 ± 0 0.15 ± 0.1 0.1 0.65 0.22 ± 0.1 The contents described herein are correct as of October, 2005 The contents ...

Page 17

Appendix 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 ...

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