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BU2365FV
Technical Note
3/16
www.rohm.com
2009.04- Rev.A
2009 ROHM Co., Ltd. All rights reserved.
Δf/f0
Hi-Z
L
H
0ppm
+60ppm
－60ppm
+15ppm
－15ppm
Vc
+30ppm
－30ppm
+45ppm
－45ppm
fH
fC
fL
※1 Period-Jitter 1
σ
This parameter represents standard deviation (=1
σ) on cycle distribution data at the time when the output clock cycles are
sampled 1000 times consecutively with the TDS7104 Digital Phosphor Oscilloscope of Tektronix Japan, Ltd.
※2 Period-Jitter MIN-MAX
This parameter represents a maximum distribution width on cycle distribution data at the time when the output clock cycles
are sampled 1000 times consecutively with the TDS7104 Digital Phosphor Oscilloscope of Tektronix Japan, Ltd.
※3 Output Lock-Time
This parameter represents elapsed time after power supply turns ON to reach a voltage of 3.0 V, after the system is
switched from Power-Down state to normal operation state, or after the output frequency is switched, until it is stabilized at
a specified frequency, respectively.
※4 Frequency stability
f0 : This parameter means an optimum frequency at T=25℃(27.000000 MHz), which represents a value of a single piece
of IC. Since no consideration is given to the stability of the crystal oscillator, it should be separately studied according to
the system in use.
※5 Frequency sensitivity/Frequency sensitivity linearity
These parameters represents that the frequency falls within the area shown in Fig. 2 in the control circuit of control voltage
shown in Fig. 1. It shows the value of IC itself. Since no consideration is given to the stability of the crystal oscillator, it
should be separately studied according to the system in use.
※Common – Recommended crystal oscillators
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=30Ωand Crystal oscillator load CL=10pF. Consequently, in order to use the BU2365FV, the said crystal oscillator is
recommended.
Fig.1 Control Circuit of Control Voltage
Frequency sensitivity dispersion range
:
fL = -45±15ppm, fC = 0±15ppm, fH = 45±15ppm
However, frequency sensitivity linearity
:
-10ppm≦(fH - fC) -( fC - fL) ≦+10ppm
Fig. 2 Frequency Sensitivity Dispersion Range
※6 Buffer skew
This parameter is only functional when the BUF_OUT1 and the BUF_OUT2 are driven at the same load capacitance.
R2
Vc
BU2365FV
R1：R2=1：0.875
R1
10Pin： VCTRL
9Pin
： VDD_V
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