Vaishali Semiconductor VT83201S1X, VT83201-DW, VT83201S1, VT83201-D Datasheet
C
VT83201
3.3V Low Phase Noise VCXO
(Voltage-Controlled Crystal Oscillator)
and PLL Clock Synthesizer
Applications
•= DSL clock source
•= Set-top boxes
•= Telecom switching
General Description
The Vaishali VT83201 is a single-c hip, integrated VCXO and Phase Locked Loop (PLL) clock synthesizer.
The device uses the VCXO and an analog Phase-Loc ked Loop (PLL) to ac cept a 10 MHz to 20 MHz, 30pF
(pull range of 200 ppm ) crystal input, in order to produce either one or two output clock s. A 0 to 3V c ontrol
signal is used to fine tune the output clock frequency in the ±100ppm range. Select inputs S0 and S1 ar e
used for frequency and output selection.
Features
•= 3.3V supply operation
•= Packaged in 16-pin SOIC package
•= Replaces separate VCXO and multiplier
•= Uses inexpensive pullable crystal
•= On-chip VCXO with 200 ppm pull range (±100 ppm)
•= MPEG Video clock source
•= HDTV
•= 5V-tolerant control inputs
•= Zero ppm synthesis error in both
clocks
Figure 1. Functional Block Diagram
VIN
10-20 MHz
Pullable
Crystal
X2
X1
Load Cap Control
Load
Caps
VDD1 VDD2
Low
Phase
osc
Noise
PLL
Output
Buffer
Output
Buffer
LK1
CLK2
2001-04-12 Page 1 MDST-0011-01
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
S1:S0
www.vaishali.com
OE
VT83201
Figure 2. Pin Configuration
VT83201
16 pin SOIC
X1
V
DD
V
DD
VIN
GND
GND
GND
OE
1
1
2
3
1
4
5
6
7
8
16
15
14
13
12
11
10
X2
NC
S1
GND
CLK2
VDD2
S0
9
CLK1
Table 1. Pin Description
Name Pin # Type Description
X1 1 XI Crystal connection. Connect to a pullable crystal of 10–20 MHz
VDD1 2,3 P Core VDD. Connect to 3.3V
VIN 4 I Voltage input to VCXO. Zero to 3V signal controls the frequency of the VCXO.
GND 5,6, 7,13 P Connect to ground.
OE 8 I Active HIGH Output enable . Outputs in Hi-Z state when LOW
CLK1 9 O Clock output #1 per Table 2.
S0 10 I Select input #0. Selects output per Table 2
VDD2 11 P Output VDD. Connect to 3.3V
CLK2 12 O Clock output #2 per Table 2
S1 14 I Select input #1. Selects outputs per Table 2
NC 15 - There is no internal connection to this pin.
X2 16 XO Crystal connection. Connect to a pullable crystal of 10 MHz – 20 MHz.
Legend: I = Input
O = Output
P = Power supply connection
XI, XO = Crystal connections.
2001-04-12 Page 2 MDST-0011-01
www.Vaishali.com
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
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