2001-04-17 Page
1
MDST-0003-03
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
Applications
= Set-top boxes
= Telecom switching
= HDTV
= MPEG Video clock source
General Description
The Vaishali VT83027 is a single-chip, integrated VCXO and Phase Locked Loop (PLL) clock synthesizer.
The device uses the VCXO and an analog Phase-Locked Loop (PLL) to accept a 13.5 MHz, 14 pF (pull
range of 200 ppm) crystal input, and produce a 27 MHz output. A 0 to 3V control signal is used to fine tune
the output clock frequency in the 100ppm range.
Features
= 3.3V supply operation
= Low jitter PLL Clock Synthesizer
-
= Zero ppm synthesis error
= Uses inexpensive pullable crystal
=
12mA drive capability
= On-chip oscillator with 200 ppm pull
range (100 ppm)
= 8 pin SOIC package
VT83027
27MHz, 3.3V VCXO
(Voltage-Controlled Crystal Oscillator)
Figure 1. Functional Block Diagram
CLK1
VDD2
X2
Load Cap
Control
Low
Phase
Noise
PLL
Output
Buffer
osc
VDD1
13.5 MHz
Pullable
Crystal
VIN
X1
GND1
GND2
Load
Caps
8 pin (150 mil) SOIC
VT83027
X1
X2
VDD1
VIN
GND2
CLK
1
2
3
4
5
6
7
8
GND1
VDD2
Figure 2. Pin Configuration
VT83027
2001-04-17 Page
2
MDST-0003-03
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
Table 1. Pin Description
Name Pin
# Type
Description
X1
1
Xi
Crystal connection. Connect to a 13.5 MHz pullable crystal
VDD1 2
P Core
V
DD
. Connect to 3.3V
VIN
3
I
Voltage input to VCXO. Zero to 3V signal controls the frequency of the
VCXO.
GND2
4
P
Connect to ground.
CLK
5
O
Clock output
VDD2
6
P
Output driver V
DD
. Connect to 3.3V
GND1
7
P
Connect to ground.
X2
8
Xi
Crystal connection. Connect to a13.5 MHz pullable crystal.
Legend: I = Input
O = Output
P = Power supply connection
Xi = Crystal connections.
Table 2. Pullable Crystal Specifications
Parameter Value
Correlation (load) capacitance
14 pF
C0/C1 240
max
ESR
35
max
Operating Temperature
0
C to +70
C
Initial Accuracy
20 ppm
Temperature + Aging Stability
50 ppm
Table 3. Absolute Maximum Ratings
Parameter Conditions
Min
Typ
Max
Units
Supply voltage, V
DD
Referenced to GND
5
V
Inputs and Clock Outputs
Referenced to GND
-0.5
VDD+0.5
V
Soldering Temperature
Max of 10 seconds
260
C
Storage temperature
-65
150
C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only and correct functional operation of the device at these
or any other conditions above those listed in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
VT83027
2001-04-17 Page
3
MDST-0003-03
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063
Table 4. Operating Conditions
Parameter Conditions
Min
Typ
Max
Units
Operating Voltage, V
DD
3.15
3.3
3.45
V
Input High Voltage, V
IH
X1 pin only
2.5
V
Input Low Voltage, V
IL
X1 pin only
0.4
V
Operating Temperature
0
70
C
VCXO control voltage, V
IN
0
3
V
Table 5. DC Electrical Characteristics
T
A
= 0
C to +70
C, V
DD
= 3.15 V to 3.45 V
Symbol Parameter
Condition
Min
Typ
(1)
Max Units
V
OH
Output High Voltage
I
OH
=-12mA 2.4
V
V
OL
Output Low Voltage
I
OL
=12mA
0.4
V
I
IL
Input Low Leakage Current
V
IN
= 0v
-60
A
I
IH
Input High Leakage Current
V
IN
= 3.45v
X1 and V
IN
inputs
60
A
I
OS
Short Circuit Current
Each output
85
mA
C
IN
Input
Capacitance
7
pF
I
DDQ
Quiescent Power Supply Current
No load
18
mA
I
DD
Operating Supply Current
No Load
28
mA
Note
:
1. Typical values are at V
DD
= 3.3V and 25C
Table 6. AC Electrical Characteristics
T
A
= 0
C to +70
C, V
DD
= 3.15 V to 3.45 V
Symbol Parameter Condition
Min
Typ
Max
Units
fosc
Input Crystal Frequency
13.500
MHz
tr
Output Clock Rise Time
0.8 to 2.0V
1.5
ns
tf
Output Clock Fall Time
2.0 to 0.8V
1.5
ns
t
od
Output Clock Duty Cycle
At V
DD
/2 40
60
%
t
jit
(pk- pk)
Maximum Absolute Jitter
(Peak to Peak)
100
ps
Output
pullability
0V
V
IN
3V
100 ppm
Note
:
1. Typical values are at V
DD
= 3.3V and 25C
Ordering Information
Part Number
Marking
Shipping/Packaging
No. of Pins
Package
Temperature
VT83027S1 VT83027S1
Tubes
8
SOIC 0
C to +70
C
VT83027S1X
VT83027S1
Tape & Reel
8
SOIC
0
C to +70
C
VT83027/D
Dice in waffle-pack
0
C to +70
C
VT83027/DW
Dice in wafer form
0
C to +70
C
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