CF5020 series
High-Frequency, 3rd Overtone Crystal Oscillator Module ICs
OVERVIEW
The CF5020 series are high-frequency, 3rd overtone crystal oscillator module ICs. They incorporate an oscilla-
tor circuit and an output buffer that operate at high frequency on a single chip. The oscillator circuit employs
CMOS inverters and a built-in damping resistor R
D
, reducing the crystal current compared with existing
devices. The damping resistor R
D
is fabricated using NPC’s unique high-precision thin-film resistor technol-
ogy, which suppresses oscillator characteristic variations due to changes in temperature and voltage to a mini-
mum. The CF5020 series can be utilized to construct stable, high-frequency, 3rd overtone crystal oscillators.
FEATURES
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R
D
built-in to reduce crystal current in the oscilla-
tor circuit
2.25 to 3.6V operating supply voltage range
Recommended operating frequency range
(varies with version)
• 2.5V operation: 60 to 155MHz
• 3.0V operation: 60 to 170MHz
– 40 to 85
°
C operating temperature range
Oscillator capacitors with excellent frequency
response built-in
Feedback resistors with good temperature charac-
teristics built-in
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Standby function
• High impedance in standby mode, oscillator stops
Low standby current
• Power-saving pull-up resistor built-in
Oscillation detector function
CMOS output duty level (1/2VDD)
50
±
5% output duty (at 1/2VDD)
30pF output load (3.3V operation)
Molybdenum-gate CMOS process
Chip form (CF5020AL
×
)
APPLICATIONS
I
Crystal oscillator modules (3rd overtone oscillation)
SERIES CONFIGURATION
Recommended operating
frequency range
*1
[MHz]
gm ratio
2.5V operation 3.0V operation
CF5020ALA
CF5020ALB
CF5020ALC
CF5020ALD
60 to 80
70 to 115
105 to 135
110 to 155
60 to 90
80 to 125
115 to 145
135 to 170
0.6
0.8
1.0
1.0
Oscillator circuit constants
Built-in capacitance Feedback Damping
resistance resistance
C
G
[pF] C
D
[pF]
Rf [k
Ω
]
R
D
[
Ω
]
4
3
1
1
7
3
3
5
2.5
4.5
3.3
2.2
200
57
CMOS
57
57
Yes
High
impedance
INHN
input
level
Standby mode
Oscillator
stop
function
Output
state
Version
*1. The recommended operating frequency is a yardstick value derived from the crystal used for NPC characteristics authentication. However, the oscilla-
tor frequency band is not guaranteed. Specifically, the characteristics can vary greatly due to crystal characteristics and mounting conditions, so the
oscillation characteristics of components must be carefully evaluated.
ORDERING INFORMATION
Device
CF5020AL
×
–2
Package
Chip form
NIPPON PRECISION CIRCUITS INC.—1
NPC [ NIPPON PRECISION CIRCUITS INC ]
