722MLFT [IDT]

Clock Generator, 28MHz, CMOS, PDSO8, 0.150 INCH, LEAD FREE, SOIC-8;


型号：	722MLFT
厂家：	INTEGRATED DEVICE TECHNOLOGY
描述：	Clock Generator, 28MHz, CMOS, PDSO8, 0.150 INCH, LEAD FREE, SOIC-8 时钟光电二极管外围集成电路晶体
文件：	总7页 (文件大小：172K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DATASHEET

LOW COST 27 MHZ 3.3 VOLT VCXO

ICS722

Description

Features

The ICS722 is a low cost, low-jitter, high-performance 3.3

volt VCXO designed to replace expensive discrete VCXOs

modules. The on-chip Voltage Controlled Crystal Oscillator

accepts a 0 to 3.3 V input voltage to cause the output

clocks to vary by over ±±00 ppm. Using IDT’s patented

VCXO techniques, the device uses an inexpensive external

pullable crystal in the range of ±6.2 to 28 MHz to produce a

VCXO output clock at that same frequency.

• Packaged in 8-pin SOIC (Pb free, RoHS compliant)

• Operational frequency range of ±6.2 MHz to 28 MHz

• Uses an inexpensive external crystal

• On-chip patented VCXO with pull range of 230 ppm

(minimum)

• VCXO tuning voltage of 0 to 3.3 V

• Operating voltage of 3.3 V

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

• ±2 mA output drive capability at TTL levels

• Advanced, low-power, sub-micron CMOS process

IDT manufactures the largest variety of Set-Top Box and

multimedia clock synthesizers for all applications. Consult

IDT to eliminate VCXOs, crystals, and oscillators from your

board.

Block Diagram

VDD

VIN

Voltage

16.2-28MHz

Pullable

Controlled

Crystal

16.2-28MHz Clock

(REFOUT)

Crystal

Oscillator

GND

IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO

ICS722

REV C 051310

ICS722

LOW COST 27 MHZ 3.3 VOLT VCXO

VCXO

Pin Assignment

X 1

V D D

V I N

X 2

D C

G N D

R E F O U T

I C S 7 2 2

8 - P i n ( 1 5 0 m i l ) S O I C

Pin Descriptions

Number

Name

Type

Pin Description

Input

Crystal connection. Connect to the external pullable crystal.

VDD

VIN

Power Connect to +3.3 V (0.0±µf decoupling capacitor recommended).

Input

Voltage input to VCXO. Zero to 3.3 V signal which controls the

VCXO frequency.

GND

Power Connect to ground.

REFOUT

Output VCXO CMOS level clock output matches the nominal frequency of

the crystal.

—

Do not connect anything to this pin.

Input

Crystal connection. Connect to a external pullable crystal.

IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO

ICS722

REV C 051310

ICS722

LOW COST 27 MHZ 3.3 VOLT VCXO

VCXO

as possible and should be on the same side of the PCB as

the ICS722. There should be no via’s between the crystal

pins and the X± and X2 device pins. There should be no

signal traces underneath or close to the crystal. See

application note MAN05.

External Component Selection

The ICS722 requires a minimum number of external

components for proper operation.

Decoupling Capacitors

Crystal Tuning Load Capacitors

A decoupling capacitor of 0.0±µF should be connected

between VDD and GND on pins 2 and 4 as close to the

ICS722 as possible. For optimum device performance, the

decoupling capacitor should be mounted on the component

side of the PCB. Avoid the use of vias in the decoupling

circuit.

The crystal traces should include pads for small fixed

capacitors, one between X± and ground, and another

between X2 and ground. Stuffing of these capacitors on the

PCB is optional. The need for these capacitors is

determined at system prototype evaluation, and is

influenced by the particular crystal used (manufacture and

frequency) and by PCB layout. The typical required

capacitor value is ± to 4 pF.

Series Termination Resistor

When the PCB trace between the clock output and the load

is over ± inch, series termination should be used. To series

terminate a 50Ωtrace (a commonly used trace impedance),

place a 33Ωresistor in series with the clock line, as close to

the clock output pin as possible. The nominal impedance of

the clock output is 20Ω.

The procedure for determining the value of these capacitors

can be found in application note MAN05.

Quartz Crystal

The ICS722 VCXO function consists of the external crystal

and the integrated VCXO oscillator circuit. To assure the

best system performance (frequency pull range) and

reliability, a crystal device with the recommended

parameters (shown below) must be used, and the layout

guidelines discussed in the following section shown must be

followed.

The oscillation frequency of a quartz crystal is determined

by its “cut” and by the load capacitors connected to it. The

ICS722 incorporates on-chip variable load capacitors that

“pull” (change) the frequency of the crystal. The crystal

specified for use with the ICS722 is designed to have zero

frequency error when the total of on-chip + stray

capacitance is

±4 pF.

Recommended Crystal Parameters:

Initial Accuracy at 25°C

Temperature Stability

Aging

Load Capacitance

Shunt Capacitance, C0

C0/C± Ratio

±20 ppm

±30 ppm

±20 ppm

±4 pf

7 pF Max

250 Max

35 Ω Max

Equivalent Series Resistance

The external crystal must be connected as close to the chip

IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO

ICS722

REV C 051310

ICS722

LOW COST 27 MHZ 3.3 VOLT VCXO

VCXO

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS722. These ratings, which are

standard values for IDT 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.

Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical

parameters are guaranteed only over the recommended operating temperature range.

Item

Rating

Supply Voltage, VDD

All Inputs and Outputs

7 V

-0.5 V to VDD+0.5 V

0 to +70° C

Ambient Operating Temperature

Storage Temperature

-65 to +±50° C

260°C

Soldering Temperature

Recommended Operation Conditions

Parameter

Min.

Typ.

Max.

+70

Units

° C

Ambient Operating Temperature

Power Supply Voltage (measured in respect to GND)

Reference crystal parameters

–

+3.±5

+3.45

Refer to page 3

DC Electrical Characteristics

VDD=3.3 V ±±% , Ambient temperature 0 to +70°C, unless stated otherwise

Parameter

Symbol

Conditions

Min.

3.±45

2.4

Typ.

Max.

Units

Operating Voltage

VDD

3.465

Output High Voltage

Output Low Voltage

= -±2 mA

= ±2 mA

= -4 mA

0.4

Output High Voltage (CMOS

Level)

VDD-0.4

Operating Supply Current

Short Circuit Current

IDD

No load

±50

VIN, VCXO Control Voltage

3.3

IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO

ICS722

REV C 051310

ICS722

LOW COST 27 MHZ 3.3 VOLT VCXO

VCXO

AC Electrical Characteristics

VDD = 3.3 V ±±%, Ambient Temperature 0 to +70° C, unless stated otherwise

Parameter

Output Frequency

Crystal Pullability

VCXO Gain

Symbol

Conditions

Min. Typ. Max. Units

±6.2

MHz

ppm

ppm/V

0V< VIN < 3.3 V, Note ±

+ ±±5

VIN = VDD/2 + ± V, Note ±

±20

Output Rise Time

Output Fall Time

0.8 to 2.0 V, C =±5 pF

±.5

2.0 to 0.8 V, C =±5 pF

Output Clock Duty

Cycle

Measured at ±.4 V, C =±5 pF

Maximum Output

Jitter, short term

C =±5 pF

±±0

Note ±: External crystal device must conform with Pullable Crystal Specifications listed on page 3.

Thermal Characteristics

Parameter

Symbol

Conditions

Min.

Typ. Max. Units

Thermal Resistance Junction to

Ambient

Still air

±50

±40

±20

° C/W

± m/s air flow

3 m/s air flow

Thermal Resistance Junction to Case

Marking Diagram

722MLF

######

YYWW

Notes:

±. ###### is the lot number.

2. 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 if not USA.

IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO

ICS722

REV C 051310

ICS722

LOW COST 27 MHZ 3.3 VOLT VCXO

VCXO

Package Outline and Package Dimensions (8-pin SOIC)

Package dimensions are kept current with JEDEC Publication No. 95

Millimeters

Min Max

Inches

Min Max

Symbol

A±

±.35

±.±0

0.33

0.±9

4.80

3.80

±.75

0.25

0.5±

0.25

5.00

4.00

0.0532 0.0688

0.0040 0.0098

0.0±3

0.0075 0.0098

.±890 .±968

0.020

INDEX

AREA

0.±497 0.±574

0.050 Basic

±.27 Basic

5.80

0.25

0.40

0°

6.20

0.50

±.27

8°

0.2284 0.2440

0.0±0

0.0±6

0°

0.020

0.050

8°

h x 45

A±

- C -

SEATING

PLANE

.10 (.004)

Ordering Information

Part / Order Number

722MLF

Marking

see page 5

Shipping Packaging

Tubes

Package

8-pin SOIC

Temperature

0 to +70° C

722MLFT

Tape and Reel

“LF” denotes Pb (lead) free package.

While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) 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. No

other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications

such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not

recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT

does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.

IDT™ / ICS™ LOW COST 27 MHZ 3.3 VOLT VCXO

ICS722

REV C 051310

ICS722

LOW COST 27 MHZ 3.3 VOLT VCXO

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

For Tech Support

www.idt.com/go/clockhelp

Corporate Headquarters

Integrated Device Technology, Inc.

www.idt.com

Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered

trademarks used to identify products or services of their respective owners.

Printed in USA

722MLFT [IDT]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E