Vaishali Semiconductor VT83027S1X, VT83027S1, VT83027-D, VT83027-DW Datasheet

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 [phone]

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 [phone]

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 VDD. 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 Ω 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, VDD 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.