Low Phase Noise Divider by 2 VCXO (10MHz to 20MHz)
FEATURES
•
•
•
•
•
•
•
Integrated voltage-controlled crystal oscillator
circuitry (VCXO) (pull range 380ppm minimum).
VCXO tuning range: 0V - V
DD
V.
Uses inexpensive fundamental-mode parallel
resonant crystals (from 20 to 40MHz).
Integrated divider by 2: output range of 10MHz
to 20MHz.
2.5V or 3.3V supply voltage.
Selectable High Drive (30mA) or Standard Drive
(10mA) output.
Available in 8-Pin TSSOP or SOIC.
PIN CONFIGURATION
XOUT
N/C
VCON
GND
1
8
XIN
OE^
VDD
CLK
ABV0252
2
3
4
7
6
5
Note: ^ denotes internal pull up
OUTPUT RANGE
DESCRIPTION
DIVIDER
FREQUENCY
RANGE
10 - 20MHz
OUTPUT
BUFFER
CMOS
The ABV0252 is a monolithic low jitter, high per-
formance CMOS VCXO IC Die. It allows the control
of the output frequency with an input voltage
(VCON), using a low cost crystal.
This makes the ABV0252 ideal for a wide range of
applications requiring a VCXO output in the 10MHz
to 20MHz range, using a fundamental crystal ranging
from 20 to 40 MHz.
÷
2
BLOCK DIAGRAM
X IN
XOUT
XTAL
OSC
C LK
V A R IC A P
OE
VCON
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 1
ABV0252
Low Phase Noise Divider by 2 VCXO (10MHz to 20MHz)
PIN DESCRIPTIONS
Name
XOUT
N/C
VCON
GND
CLK
VDD
OE
XIN
Number
1
2
3
4
5
6
7
8
Type
I
-
I
P
O
P
I
I
Description
Crystal output. See Crystal Specifications on page 4.
Not connected.
Voltage Control input.
Ground.
Output clock.
Power supply.
Output enable input. Disables (tri-state) output when low. Internal pull-up
enables output by default if pin is not connected to low.
Crystal input. See Crystal Specifications on page 4.
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS
Supply Voltage
Input Voltage, dc
Output Voltage, dc
Storage Temperature
Ambient Operating Temperature*
Junction Temperature
Lead Temperature (soldering, 10s)
ESD Protection, Human Body Model
SYMBOL
V
DD
V
I
V
O
T
S
T
A
T
J
MIN.
-0.5
-0.5
-65
-40
MAX.
4.6
V
DD
+0.5
V
DD
+0.5
150
85
125
260
2
UNITS
V
V
V
°C
°C
°C
°C
kV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the
device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other con-
ditions above the operational limits noted in this specification is not implied.
*
Note:
Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only.
2. DC Electrical Specifications
PARAMETERS
Supply Current, Dynamic, with
Loaded Outputs
Operating Voltage
Output drive current
(High Drive)
Output drive current
(Standard Drive)
Short Circuit Current
VCXO Control Voltage
SYMBOL
I
DD
V
DD
I
OH
I
OL
I
OH
I
OL
VCON
CONDITIONS
F
XIN
= 20 - 52MHz
Output load of 10pF
V
OH
= V
DD
-0.4V, V
DD
=3.3V
V
OL
= 0.4V, V
DD
= 3.3V
V
OH
= V
DD
-0.4V, V
DD
=3.3V
V
OL
= 0.4V, V
DD
= 3.3V
MIN.
TYP.
10
MAX.
UNITS
mA
2.25
30
30
10
10
±50
0
3.63
V
DD
V
mA
mA
mA
mA
mA
V
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 2
ABV0252
Low Phase Noise Divider by 2 VCXO (10MHz to 20MHz)
3. AC Electrical Specifications
PARAMETERS
Input Crystal Frequency
Output Clock Rise/Fall Time
(Standard Drive)
Output Clock Rise/Fall Time
(High Drive)
Output Clock Duty Cycle
SYMBOL
CONDITIONS
0.3V ~ 3.0V with 15 pF load
0.3V ~ 3.0V with 15 pF load
Measured @ 50% V
DD
MIN.
20
TYP.
2.4
1.2
MAX.
52
UNITS
MHz
ns
45
50
55
%
4. Voltage Control Crystal Oscillator
PARAMETERS
VCXO Stabilization Time *
VCXO Tuning Range
CLK output pullability
VCXO Tuning Characteristic
Pull range linearity
VCON input impedance
VCON modulation BW
SYMBOL
T
VCXOSTB
CONDITIONS
From power valid
F
XIN
= 20 - 40MHz;
XTAL C
0
/C
1
< 250
0V
≤
VCON
≤
3.3V
VCON=1.65V
±1.65V
MIN.
TYP.
MAX.
10
UNITS
ms
ppm
ppm
ppm/V
%
kΩ
kHz
500
±200
150
10
80
0V
≤
VCON
≤
3.3V, -3dB
25
Note:
Parameters denoted with an asterisk (*) represent nominal characterization data and are not production tested to any specific limits.
5. Jitter Specifications
PARAMETERS
Period jitter RMS
Period jitter peak-to-peak
Integrated jitter RMS
CONDITIONS
20MHz
20MHz
Integrated 12 kHz to 20 MHz at 20MHz
MIN.
TYP.
2.5
20
1
MAX.
UNITS
ps
ps
ps
6. Phase Noise Specifications
PARAMETERS
Phase Noise relative
to carrier
FREQUENCY
20MHz
@10Hz
-65
@100Hz
-90
@1kHz
-120
@10kHz
-140
@100kHz
-147
UNITS
dBc/Hz
Note: Phase Noise at VCON = 0V – to be measured
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 3
ABV0252
Low Phase Noise Divider by 2 VCXO (10MHz to 20MHz)
7. Crystal Specifications
PARAMETERS
Crystal Resonator Frequency
Crystal Loading Rating
Crystal Pullability
Recommended ESR
SYMBOL
F
XIN
C
L (xtal)
C
0
/C
1 (xtal)
R
E
CONDITIONS
Parallel Fundamental Mode
At Vcon = 1.65V
AT cut
AT cut
MIN.
20
TYP.
MAX.
40
UNITS
MHz
pF
9.5
250
30
-
Ω
Note:
Crystal Loading rating: 9.5pF is the loading the crystal sees from the VCXO chip at VCON = 1.65V. It is assumed that the crystal will be at nomi-
nal frequency at this load. If the crystal requires more load to be at nominal frequency, the additional load must be added externally.
This however may reduce the pull range.
PACKAGE INFORMATION
8 PIN ( dimensions in mm )
Narrow SOIC
Symbol
A
A1
B
C
D
E
H
L
e
Min.
1.47
0.10
0.33
0.19
4.80
3.80
5.80
0.38
Max.
1.73
0.25
0.51
0.25
4.95
4.00
6.20
1.27
1.27 BSC
Min.
-
0.05
0.19
0.09
2.90
4.30
6.20
0.45
TSSOP
Max.
1.20
0.15
0.30
0.20
3.10
4.50
6.60
0.75
0.65 BSC
A1
B
e
C
L
A
D
E
H
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
www.Abracon.com
03/21/05 Page 4
ABV0252
Low Phase Noise Divider by 2 VCXO (10MHz to 20MHz)
ORDERING INFORMATION
For part ordering, please contact our Sales Department:
30332 Esperanza., Rancho Santa Margarita, Ca 92688
Ph: 949-546-8000 Fax: 949-546-8001
PART NUMBER
The order number for this device is a combination of the following:
Device number, Package type and Operating temperature range
ABV0252 (H) X C
PART NUMBER
TEMPERATURE
C=COMMERCIAL
I=INDUSTRAL
PACKAGE TYPE
O=TSSOP , S=SOIC
Optional High Drive
Order Number
ABV0252OC-T
ABV0252OC
ABV0252HOC-T
ABV0252HOC
ABV0252SC-T
ABV0252SC
ABV0252HSC-T
ABV0252HSC
Marking
ABV0252OC
ABV0252OC
ABV0252HOC
ABV0252HOC
ABV0252SC
ABV0252SC
ABV0252HSC
ABV0252HSC
Package Option
TSSOP - Tape and Reel
TSSOP – Tube
TSSOP - Tape and Reel
TSSOP - Tube
SOIC
SOIC
SOIC
SOIC
-
-
-
-
Tape and Reel
Tube
Tape and Reel
Tube
Abracon Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information fur-
nished by Abracon is believed to be accurate and reliable. However, Abracon makes no guarantee or warranty concerning the accuracy of said infor-
mation and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product.
LIFE SUPPORT POLICY:
Abracon’s products are not authorized for use as critical components in life support devices or systems without the express
written approval of the President of Abracon Corporation.
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001
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