ics728 Integrated Device Technology, ics728 Datasheet

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ics728

Manufacturer Part Number
ics728
Description
Low Cost 27 Mhz 3.3 Volt Vcxo
Manufacturer
Integrated Device Technology
Datasheet

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Part Number
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Part Number:
ics728MLF
Manufacturer:
NUVOTON
Quantity:
20
LOW COST 27 MHZ 3.3 VOLT VCXO
Description
The ICS728 combines the functions of a VCXO (Voltage
Controlled Crystal Oscillator) and PLL (Phase Locked
Loop) frequency doubler onto a single chip. Used in
conjunction with an external pullable quartz crystal, this
monolithic integrated circuit replaces more costly hybrid
(canned) VCXO devices. The ICS728 is designed primarily
for data and clock recovery applications within end products
such as set-top box receivers.
The ICS728 exhibits a moderate VCXO gain of 110 ppm/V
typical, when used with a high quality external pullable
quartz crystal.
The frequency of the on-chip VCXO is adjusted by an
external control voltage input into pin VIN. Because VIN is a
high impedance input, it can be driven directly from an
PWM RC integrator circuit. Frequency output increases
with VIN voltage input. The usable range of VIN is 0 to 3.3
V.
Block Diagram
IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO
13.5 MHz
Pullable
Crystal
VIN
X1
X2
Controlled
Oscillator
Voltage
Crystal
Frequency
Doubler
PLL
1
Features
Ideal for set-top box applications using 13.5 MHz external
pullable crystal to generate lock 27 MHz clock transport
video clock
On-chip VCXO with guaranteed pull range of ±110 ppm
minimum
VCXO input tuning voltage 0 to 3.3 V
Packaged in 8-pin SOIC (150 mil wide)
Available in Pb (lead) free package
27 MHz
(2x Crystal Frequency)
ICS728
DATASHEET
ICS728
REV B 012505

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ics728 Summary of contents

Page 1

... VCXO devices. The ICS728 is designed primarily for data and clock recovery applications within end products such as set-top box receivers. The ICS728 exhibits a moderate VCXO gain of 110 ppm/V typical, when used with a high quality external pullable quartz crystal. The frequency of the on-chip VCXO is adjusted by an external control voltage input into pin VIN ...

Page 2

... Voltage input to VCXO. Zero to 3.3 V analog input which controls the oscillation frequency of the VCXO. Power Connect to ground. Output Clock output not connect to this pin Power Connect to ground. Input Crystal connection. Connect to the external pullable crystal. 2 Pin Description ICS728 VCXO REV B 012505 ...

Page 3

... CL. To determine the value of the crystal capacitors: 1. Connect VDD of the ICS728 to 3.3 V. Connect pin 3 of the ICS728 to the second power supply. Adjust the voltage on pin 3 to 0V. Measure and record the frequency of the CLK output ...

Page 4

... The value for each of these caps (in pF) is given by: Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS728. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied ...

Page 5

... JA θ Min. Typ. Max. Units 3.15 3.45 2.4 0.4 VDD-0.4 12 ±50 0 3.3 Min. Typ. Max. Units 27 MHz + 110 ppm 120 ppm/V 1.5 1 100 Min. Typ. Max. Units °C/W 150 °C/W 140 °C/W 120 °C/W 40 ICS728 VCXO REV B 012505 ...

Page 6

... YYWW is the last two digits of the year and week that the part was assembled. 3. “LF” denotes Pb (lead) free package. 4. Bottom marking: (origin) Origin = country of origin of not USA. IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO Marking Diagram (Pb free) 8 728MLF ###### YYWW 1 6 VCXO 5 4 ICS728 REV B 012505 ...

Page 7

... ICS728MLF ICS728MLFT Parts that are ordered with a “LF” suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use ...

Page 8

... LOW COST 27 MHZ 3.3 VOLT VCXO Revision History Rev. Originator Date Description of Change A J. Sarma 12/14/04 Release from Prelim to Final; release as General purpose device Sarma 01/25/05 Add marking diagrams; add LF. IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO 8 VCXO ICS728 REV B 012505 ...

Page 9

... ICS728 LOW COST 27 MHZ 3.3 VOLT VCXO Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800 345 7015 +408 284 8200 (outside U.S.) © ...

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