V C X O “G” series
What is a VCXO ?
Logic: TTL / CMOS
Wave Form: Square
Crystal
MERCURY
Since 1973
Unlike regular clock oscillator which has fixed output frequency, the output
frequency of a
VCXO
(also known as “frequency
modulator”)
can be tuned
±50~±200 ppm up or down from the nominal frequency by varying the
control voltage on the voltage control pin. Varactor, a voltage variable
capacitance tuning diode, is used to achieve this purpose.
Amplifier
Output
Varactor
Applications of VCXO include (PLL) phase lock loop, SONET/ATM, set-top
boxes, MPEG , audio-video modulations, video game consoles and HDTV sets.
Product Summary:
Package Code
Thru-Hole Types
G14
G8
500 kHz ~ 170 MHz
500 kHz ~ 170 MHz
4 pin DIL full size
4 pin DIL half size
Frequency Range
Assembly Technique
Voltage Control
Package Size (mm) [inches]
12.8 x 20.2 x 5.88H
[0.504 x 0.795 x 0.231]
12.8 x 12.8 x 5.88H
[0.504 x 0.504 x 0.231]
12.8 x 20.2 x 7.6H
[0.504 x 0.795 x 0.300]
12.8 x 12.8 x 7.6H
[0.504 x 0.504 x 0.300]
9.6 x 11.4 x 1.85H
[0.378 x 0.449 x 0.073]
9.6 x 11.4 x 2.5H
[0.378 x 0.449 x 0.098]
9.6 x 11.4 x 2.5H
[0.378 x 0.449 x 0.098]
9.6 x 11.4 x 4.7H
[0.378 x 0.449 x 0.185]
9.6 x 11.4 x 4.7H
[0.378 x 0.449 x 0.185]
5.0 x 7.0 x 1.7H
[0.197 x 0.275 x 0.067]
5.0 x 7.0 x 1.7H
[0.197 x 0.275 x 0.067]
5.0 x 7.5 x 2.65H
[0.197 x 0.295 x 0.104]
Surface Mount Types – Gull Wing
G24
G18
500 kHz ~ 170 MHz
500 kHz ~ 170 MHz
Gull wing version of G14
Gull wing version of G8
Surface Mount Types – Leadless
G61
G62
G42
G64
G44
G57
G576
G575
500 kHz ~ 170 MHz
500 kHz ~ 170 MHz
500 kHz ~ 170 MHz
500 kHz ~ 170 MHz
500 kHz ~ 170 MHz
2 MHz ~ 60 MHz
2 MHz ~ 60 MHz
500 KHz ~ 170 MHz
6 pad FR4 Leadless
6 pad FR4 Leadless
4 pad FR4 Leadless
6 pad FR4 Leadless
4 pad FR4 Leadless
4 pad Ceramic Leadless
6 pad Ceramic Leadless
6 pad Leadless
MERCURY www.mercury-crystal.com
Taiwan: TEL (886)-2-2695-7099, FAX (886)-2-2695-7473, e-mail:
sales-tw@mercury-crystal.com
U.S.A.: TEL (1)-909-466-0427, FAX (1)-909-466-0762, e-mail:
sales-us@mercury-crystal.com
MERCURY
Page 1 of 6
Date: Dec. 1, 2001
Rev. 0
V C X O “G” series
Logic: TTL / CMOS
Wave Form: Square
MERCURY
Since 1973
“G” series General Specifications
T
A
=+25°C, V
DD
= At specified voltage, CL=15 pF
3.3 V System
V
DD
= +3.3 V D.C. ±5%
Control Voltage Center (Vc)= +1.65 V
Voltage code is “3"
To tune to the nominal frequency with
Vc = 1.65 V±0.2V
500 kHz ~ 100 MHz
500 kHz ~ 90 MHz
5.0 V System
V
DD
=+5.0 V D.C.±5%
Control Voltage Center (Vc) = +2.5 V
Voltage code is "5"
To tune to the nominal frequency with
Vc = 2.5V V±0.2V
500 kHz ~ 156 MHz
500 kHz ~ 140 MHz
Input Voltage (V
DD
)
Initial Frequency Accuracy (at+25°C)
Commercial temperature
Frequency
(0°C to +70°C)
Range
Industrial temperature
(-40°C to +85°C)
TTL
Output Voltage HIGH “1”
CMOS
TTL
Output Voltage LOW “0”
CMOS
Frequency Pulling Range
Frequency Stability
(1)
Commercial temp. range (code “C”)
Frequency Stability
(1)
Industrial temp. range (code “
I
”)
Output Load
Rise Time (Tr) and
Fall Time (Tf)
Duty Cycle
Start-up Time (Ts)
Linearity
Slope Polarity (Transfer Function)
Current Consumption
Modulation Bandwidth (±3 dB)
Input Impedance
Storage Temperature
Aging
Jitter, one sigma, 155.520 MHz, +5 V
(1)
TTL
CMOS
TTL
CMOS
TTL
CMOS
2.4 V min.
2.4 V min.
2.97 min.
Vcc – 0.5 min.
0.4 V max.
0.4 V max.
0.33 max.
0.5 V max.
From ±30 ppm to ±150 ppm
From ±80 ppm to ±200 ppm
Control Voltage Range: 0.3 V to 3.0 V
Control Voltage Range: 0.5 V to 4.5 V
“A”: ±25 ppm over 0°C to +70°C
“B”:±50 ppm over 0°C to +70°C
“C”:±100 ppm over 0°C to +70°C
For non-standard please give desired frequency stability after the “C”.
For example “C20” is ±20 ppm over 0 to +70°C
“D”:±25 ppm over -40°C to +85° (not available on all packages)
“E”:±50 ppm over -40°C to +85°C
“F”:±100 ppm over -40°C to +85°C
For non-standard please give desired frequency stability after the “
I
”.
For example “
I
20” is ±20 ppm over -40 to +85°C
5 ~ 10 TTL gates
15 ~ 50 pF
5 n Sec. max; 2 n Sec. typical. Measured between 0.4V to 2.4V
(RL=390
Ω;
CL=15 pF)
5 n Sec. max; 2 n Sec. typical. Measured between 10% to 90%V
DD
(CL=15 pF)
40% min. 60 % max. (measured at +1.4 V)
40% min. 60 % max. (measured at 50% V
DD
)
10 m Sec. max. 5 m Sec. typical
10% max.; 6% typical
Monotonic and Positive:
Increasing control voltage always increases output
frequency. Negative slope is also available.
15 ~ 45 mA (frequency dependent)
10 kHz min.
10 kΩ at 10 kHz min.
-40°C to +85°C
±5 ppm per year max.
25 ps typical, 28 ps max.
Inclusive of 25°C tolerance, operating temperature range, ±10% input voltage variation, load change, aging, shock and
vibration.
MERCURY
Page 2 of 6
Date: Dec. 1, 2001
Rev. 0
V C X O “G” series
Ordering Information:
G --
Input
Voltage
“3” for +3.3V
“5” for +5.0V
Part Number Examples:
3G44B-120T-54.000
Output Waveform:
Tr
V
OH
Tf
Package
Code
Logic: TTL / CMOS
Wave Form: Square
Desired pulling
range in ± ppm
Frequency
Stability
Choose from
A,B,C,
D,E,F,or
custom
Pulling
Range
Range
Code
MERCURY
Since 1973
Frequency
in MHz
Nominal
Frequency
"M" for maximum
"N" for minimum
"T" for typical (tolerance is ±20%)
represents 54.0 MHz VCXO in G44 package, frequency stability is ±50
ppm from 0°C to +70°C, pullability is ±120 ppm typical, +3.3 V.
Transfer Function:
Typical response of 5G14C-150N-27.000
TTL CMOS
+150
+100
+50
0
-50
-100
-150
Freq. Deviation
(ppm)
2.4V 90%V
DD
(at +25°C, postive transfer)
1.4V 50%V
DD
V
OL
T
H
T
Duty Cycle = (T
H
/ T)x100%
0
.4V 10%V
DD
0.5
1.5
2.5
3.5
4.5
Control Voltage (V)
" ------ " : Theoretical 0% non-linearity
SSB Phase Noise:
dBc/ Hz
-60
-70
-80
-90
-100
-110
-120
-130
155.520 MHz at +3.3V
G series
GL series
-140
10 Hz
98
87
76
65
54
43
32
21
10
9
-100 Hz
1 kHz
10 kHz
offset
100 kHz
MERCURY
Page 3 of 6
Date: Dec. 1, 2001
Rev. 0
Programming Basics
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