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PDF CF5074B Data sheet ( Hoja de datos )
| Número de pieza | CF5074B | |
| Descripción | VCXO Module IC | |
| Fabricantes | Nippon Precision Circuits | |
| Logotipo |  |
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CF5074B
VCXO Module IC with Built-in Varicap
OVERVIEW
The CF5074B is VCXO module IC with built-in varicap diodes. The integrated varicap diode BiCMOS pro-
cess allows the device to be fabricated on a single chip. A newly developed oscillator circuit features reduced
drive level of crystal and wide pullrange. A VCXO module can be constructed with just the connection of a
crystal unit, making the devices ideal as surface-mounted, compact VCXO modules.
FEATURES
I 2.25 to 3.6V operating supply voltage range
I 50MHz to 80MHz operating frequency range
I Varicap diode built-in
I Oscillation start-up detector function
I CMOS output duty level
I 4mA (min) output drive capability
I 15pF output load
I Standby function
• High impedance in standby mode
I BiCMOS process
I Chip form (CF5074B)
APPLICATIONS
I VCXO modules
ORDERING INFORMATION
Device
CF5074B−1
CF5074B−3
Package
Chip form
SEIKO NPC CORPORATION —1
1 page  
MEASUREMENT CIRCUITS
Measurement Circuit 1
CF5074B
Measurement Circuit 4
When measuring VOL
When measuring VOH
VDD
VC
INHN
TESN
VSS
Q
V
A
Measurement Circuit 2
A
Crystal
VDD
XT INHN
XTN
VC
VSS
Q
VC = 0.5VDD, INHN = open, crystal oscillation
Measurement Circuit 3
IXT A
VXTN V
IXTN A
VXT V
VDD
XT
XTN
VC
VSS
VDD
XT
XTN
VC
VSS
(VDD − VXTN)
RVC1 =
IXT
(VDD − VXT)
RVC2 =
IXTN
RVC3 =
VXTN
IXT
Measurement Circuit 5
Signal
Generator
C1
R1
XT VDD INHN
VC
VSS
Q
VDD
RUP1 = VDD (VRUP = VSS)
IRUP
(VDD − 0.7VDD)
RUP2 =
(VRUP = 0.7VDD)
IRUP
INHN
VC
VSS
A
IRUP
V
VRUP
XT input signal: 10MHz, 1.0Vp-p
C1 = 0.001µF, R1 = 50Ω, VC = 0.5VDD
Measurement Circuit 6
VC = 0.5VDD
VDD
INHN
VC
VSS
Q
A
VC = 1/2VDD
SEIKO NPC CORPORATION —5
5 Page 
Output Waveform
Measurement equipment
I Oscilloscope: 54855A (Agilent)
CF5074B
VDD = 2.5V, 15pF load, VC = 1.25V
VDD = 3.3V, 15pF load, VC = 1.65V
SEIKO NPC CORPORATION —11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CF5074B.PDF ] | |
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