BU2374FV Datasheet, PDF (5/8 Pages) Rohm – VCO + phase comparator IC for PLL system

Multimedia ICs
BU2374FV
!Electrical characteristics (Unless otherwise noted,Ta=25°C, VCC=3.3V)
Parameter
VCO section
VCO_OUT Output H voltage
VCO_OUT Output L voltage
input current (VCO_INHIBIT, SELECT)
input impedance (VCO_IN)
Symbol
Min.
Typ.
Max.
VOH
3.0
−
−
VOL
−
−
0.3
IIH, IIL
−
−
−+¹
Zi
−
10
−
VCO current consumption (inhibit)
IDD(INH)
−
−
1
VCO current consumption (normal operation) IDD(vco)
−
VCO control voltage
VI(vco_in) 0.5
VCO frequency range
frange
37
Bias Resistor range
Rbias
2.0
Frequency sersibility
β1
−
Output duty
Duty
45
Output Rise-time
tr
−
Output Fall-time
tf
−
∗ 1 Value of design
Bias R=2.0kΩ 37MHz to 54MHz
guarantee
Bias R=2.4kΩ 45MHz to 58MHz
(all guarantee range) _{Bias R=3.0kΩ 53MHz to 60MHz}
∗ 2 Frequency sersibility { f1(VCOIN=2.0V)−f2(VCOIN=1.0V)} / 1.0V
∗ 3 When FSEL is H and output frequency is 1/4, culculate
12.5
−
−
VDD−0.5
−
60
−
3.0
23
−
50
55
2.5
−
2.5
−
Unit
V
V
µA
MΩ
µA
mA
V
MHz
KΩ
MHz/V
%
nsec
nsec
Conditions
IOH=−2.0mA
IOL=2.0mA
at VCO_INHIBIT=VDD
PFD_INHIBIT=VDD
Output 50MHz
∗1
∗2
at 1/2 VDD point
Time is from VDD ∗ 0.2 to vdd ∗ 0.8
Time is from VDD ∗ 0.8 to vdd ∗ 0.2
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