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Número de pieza | CF5074A | |
Descripción | VCXO Module ICs | |
Fabricantes | Nippon Precision Circuits | |
Logotipo | ||
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CF5074A
VCXO Module IC with Built-in Varicap
OVERVIEW
The CF5074A 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 (CF5074A)
APPLICATIONS
I VCXO modules
ORDERING INFORMATION
Device
CF5074A−1
CF5074A−3
Package
Chip form
SEIKO NPC CORPORATION —1
1 page CF5074A
SWITCHING CHARACTERISTICS
VDD = 2.25 to 3.6V, VC = 0.5VDD, VSS = 0V, Ta = –40 to +85°C unless otherwise noted.
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Parameter
Output rise time
Output fall time
Output duty cycle
Output disable delay time
Output enable delay time
Symbol
Conditions
tr1
Measurement circuit 2, load circuit 1,
0.2VDD → 0.8VDD, Ta = 25°C, CL = 15pF
tf1
Measurement circuit 2, load circuit 1,
0.8VDD → 0.2VDD, Ta = 25°C, CL = 15pF
Measurement circuit 2, VDD = 2.5V
Duty load circuit 1, Ta = 25°C,
CL = 15pF
VDD = 3.3V
tPLZ Measurement circuit 5, load circuit 1,
tPZL Ta = 25°C, CL ≤ 15pF
Min
–
–
40
45
–
–
Rating
Typ
2.5
2.5
50
50
–
–
Max
4
4
60
55
100
100
Unit
ns
ns
%
%
ns
ns
FUNCTIONAL DESCRIPTION
Standby Function
When INHN goes LOW, the device is in standby mode. The Q output becomes high impedance and the oscilla-
tor circuit continues running.
INHN
HIGH (or open)
LOW
Q
fO
High impedance
Oscillator
Operating
Operating
Power-saving Pull-up Resistor
The INHN pin pull-up resistance changes in response to the input level (HIGH or LOW). When INHN is tied
LOW, the pull-up resistance becomes large, reducing the current consumed by the resistance. When INHN is
left open, the pull-up resistance becomes small, such that even if the input is affected by external noise the out-
puts are stable due to INHN being tied HIGH by the pull-up resistor.
Oscillation Start-up Detector Function
The devices also feature an oscillation start-up detector circuit. This circuit functions to disable the outputs
until the oscillation starts. This prevents unstable oscillator output at oscillator start-up when power is applied.
SEIKO NPC CORPORATION —5
5 Page |
Páginas | Total 9 Páginas | |
PDF Descargar | [ Datasheet CF5074A.PDF ] |
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