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PDF BU2373FV Data sheet ( Hoja de datos )
| Número de pieza | BU2373FV | |
| Descripción | High Performance VCOs | |
| Fabricantes | ROHM Semiconductor | |
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Video Accessory ICs
High Performance VCOs
for Image Sampling
BU2373FV,BU2374FV
No.11069EBT07
●Description
General-purpose VCO Series ICs (BU2373FV and BU2374FV) have a built-in VCO and phase comparator and facilitate the
configuration of a PLL system through the external connection of a LPF and frequency divider.
Furthermore, in order to facilitate the loop constant settings of the PLL system, the application manual has been enhanced to
ensure studies on the application.
●Features
1) The VCO enables midpoint settings within the range of oscillation through the external resistance.
2) The rising edge trigger type of phase comparator is built in.
3) Power-down mode setting can be made independently with the VCO and the phase comparator.
4) The VCO output frequency division can be selected on the SELECT pin.
5) Compact SSOP-B14 Package is adopted.
●Applications
CRT, LCD monitor, and CD-RW
●Line up matrix
VDD=3.0V
Supply voltage VDD=3.3V
VDD=5.0V
Frequency
range
VDD=3.0V
VDD=3.3V
VDD=5.0V
VCO-Frequency dividing mode
Operating temperature range
Package
BU2373FV
○
○
○
37～60MHz
37～65MHz
43～100MHz
1/2
-20～75℃
SSOP-B14
BU2374FV
－
○
－
－
37～60MHz
－
1/4
-20～75℃
SSOP-B14
●Absolute maximum ratings (Ta=25℃)
Symbol
Ratings
Supply voltage
VDD
-0.5～7.0
Input voltage
VIN -0.5～VDD+0.5
Storage temperature range
Tstg
-30～125
Power dissipation Pd 400
*1 Operating is not guaranteed.
*2 In the case of exceeding Ta = 25℃, 4.0mW should be reduced per 1℃.
*3 The radiation-resistance design is not carried out.
*4 Power dissipation is measured when the IC is mounted to the printed circuit board.
Unit
V
V
℃
mW
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© 2011 ROHM Co., Ltd. All rights reserved.
1/18
2011.08 - Rev.B
1 page  
BU2373FV,BU2374FV
Technical Note
●Reference data
(BU2373FV－Temperature Fluctuation Data)
100 100
80 80
60 60
40
20
0
0.0
From top:T=25℃
T=-20℃
T=75℃
0.5 1.0 1.5 2.0 2.5
Control Voltage：VI[V]
3.0
Fig.10 Control Voltage – Output Frequency
(VDD=3.0V,Rbias=1.5KΩ)
40
From top:T=75℃
20
T=25℃
T=-20℃
0
0.0
0.5 1.0 1.5 2.0 2.5
Control Voltage：VI[V]
3.0
Fig.11 Control Voltage – Output Frequency
(VDD=3.0V,Rbias=1.8KΩ)
100
80
60
40
From top:T=75℃
20
T=25℃
T=-20℃
0
0.0
0.5 1.0 1.5 2.0 2.5
Control Voltage：VI[V]
3.0
Fig.12 Control Voltage – Output Frequency
(VDD=3.0V,Rbias=2.0 KΩ)
100
80
60
40
From top:T=75℃
20
T=25℃
T=-20℃
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
Control Voltage：VI[V]
Fig.13 Control Voltage – Output Frequency
(VDD=3.3V,Rbias=1.6KΩ)
100
80
60
40
From top:T=75℃
20 T=25℃
T=-20℃
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
Control Voltage：VI[V]
Fig.14 Control Voltage – Output Frequency
(VDD=3.3V,Rbias=2.0KΩ)
100
80
60
40
From top:T=75℃
20 T=25℃
T=-20℃
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
Control Voltage：VI[V]
Fig.15 Control Voltage – Output Frequency
(VDD=3.3V,Rbias=2.2KΩ)
150
125
100
75
50
25
0
0.0
From top:T=75℃
T=25℃
T=-20℃
1.0 2.0 3.0 4.0
Control Voltage：VI[V]
5.0
Fig.16 Control Voltage – Output Frequency
(VDD=5.0V,Rbias=1.6KΩ)
150
125
100
75
50
25
0
0.0
From top:T=75℃
T=25℃
T=-20℃
1.0 2.0 3.0 4.0
Control Voltage：VI[V]
5.0
Fig.17 Control Voltage– Output Frequency
(VDD=5.0V,Rbias=2.4KΩ)
150
125
100
75
50
25
0
0.0
From top:T=75℃
T=25℃
T=-20℃
1.0 2.0 3.0 4.0
Control Voltage：VI[V]
5.0
Fig.18 Control Voltage – Output Frequency
(VDD=5.0V,Rbias=2.7KΩ)
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/18
2011.08 - Rev.B
5 Page 
BU2373FV,BU2374FV
Technical Note
●Description of operations
VCO Block
Our VCO block consists of ring oscillators using 5-step reverse Amp. Setting the 2PIN: SELECT to “H” makes it possible to
set the system to output frequency dividing mode. (The frequency is divided to 1/2 on the BU2373FV, while 1/4 on the
BU2374FV.) 50% of the frequency is guaranteed even to the duty at this time.
Furthermore, setting the 10Pin: VCO_INHIBIT to “H” makes it possible to set the system to power-down mode. While in
power-down mode, the VCO_OUT output is fixed to “L”, thus achieving reduction in Analog consumption current
approximately by 80%.
In addition, through the adjustment of external resistance value for the BIAS terminal on 13Pin, the fine adjustment of
output frequency can be made.
(VCO I/O Characteristics)
frequency
(MHz)
It is possible to adjust
center frequency with bias-
res is tor
0
Fig.52
VCO_IN (V)
* The VCO built in the BU2373FV has been designed to provide the lowest frequency sensitivity when using the VCO_IN
at about VDD/2. To make use of the VCO, it is recommended to adjust the BIAS resistance so that the voltage of the
VCO_IN will reach VDD/2.
(Configuration of VCO Block)
VCOIN
Bias
block
VCO_INHIBIT
Level
Shifter
L
1/2 1/2
H
SELECT
Fig.53
VCO_OUT
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© 2011 ROHM Co., Ltd. All rights reserved.
11/18
2011.08 - Rev.B
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet BU2373FV.PDF ] | |
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