LTC6905HS5-100 datasheet, PDF - EEWORLD Datasheet

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LTC6905HS5-100: DescriptionFixed Frequency SOT-23 Oscillator; CategoryPassive components oscillator; File Size136KB，8 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC6905HS5-100 Overview

Fixed Frequency SOT-23 Oscillator

LTC6905HS5-100 Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SOT
package instruction	PLASTIC, SOT-23, 5 PIN
Contacts	5
Manufacturer packaging code	S5
Reach Compliance Code	_compli
ECCN code	EAR99
maximum descent time	0.5 ns
Frequency Adjustment - Mechanical	NO
frequency stability	20%
JESD-609 code	e0
Installation features	SURFACE MOUNT
Nominal operating frequency	100 MHz
Maximum operating temperature	125 °C
Minimum operating temperature	-40 °C
Oscillator type	CMOS
Output load	5 pF
physical size	2.9mm x 1.75mm x 1.0mm
longest rise time	0.5 ns
Maximum supply voltage	5.5 V
Minimum supply voltage	2.7 V
surface mount	YES
maximum symmetry	52.5/47.5 %
Terminal surface	Tin/Lead (Sn/Pb)

LTC6905HS5-100 Preview

LTC6905-XXX Series

Fixed Frequency

SOT-23 Oscillator

FEATURES

■

DESCRIPTIO

No External Components to Set Frequency

Frequency Error

±0.5%

Typical

Fast Start-Up Time: 100µs Typical

±20ppm/°C

Temperature Stability

Output Enable Provided

Includes Divide by 1, 2 or 4

Rise Time: 0.5ns, C

= 5pF

Timing Jitter: <0.8% Typical

50%

±2.5%

Duty Cycle

= 8mA Typical (f

OSC

= 100MHz, C

= 5pF)

CMOS Output Drives 600Ω Load

Single Supply 2.7V to 5.5V

Low Profile (1mm) ThinSOT

Package

The LTC

6905-XXX series of parts are precision, fixed

frequency, silicon oscillators designed to minimize board

space while maximizing accuracy and ease of use.

Programmed at the factory to a fixed frequency, the

LTC6905-XXX series of parts need no external trim com-

ponents. An internal three-state divider allows for division

of the master clock by 1, 2 or 4, providing 3 frequencies

(for each device).

The LTC6905-XXX series operate with a single 2.7V to

5.5V power supply and provide a rail-to-rail, 50% duty

cycle, square wave output. The OE pin will disable the

output when brought low and synchronously enable the

output when brought high, avoiding pulse slivers.

The four products of the LTC6905-XXX family are:

LTC6905-133: f

OSC

= 133MHz, 66.7MHz, 33.3MHz

LTC6905-100: f

OSC

= 100MHz, 50MHz, 25MHz

LTC6905-96: f

OSC

= 96MHz, 48MHz, 24MHz

LTC6905-80: f

OSC

= 80MHz, 40MHz, 20MHz

The LTC6905-XXX series of parts are designed with a factory

trim option to modify the divider ratios from 1, 2, 4 to 8, 16,

32. A second trim option allows for additional master clock

frequencies. For the alternate divider ratios and unlisted

frequencies, contact LTC marketing.

APPLICATIO S

■

Data Clocks for High Reliability Applications

High Vibration, High Acceleration Environments

Replacement for Fixed Crystal and Ceramic

Oscillators

, LTC and LT are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6614313, 6342817.

TYPICAL APPLICATIO

Typical Distribution of Frequency Error, T

= 25°C

= 3V

Basic Connection

OSC

= 133MHz

UNITS

0.1µF

OUT

LTC6905-133

GND

DIV

6905x TA01

÷1

÷4

÷2

OPEN

–1

–0.5

0.0

0.5

% FREQUENCY ERROR

6905x TA02

6905xf

LTC6905-XXX Series

ABSOLUTE

(Note 1)

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

TOP VIEW

GND 2

OE 3

4 DIV

5 OUT

Supply Voltage (V

) to GND ........................– 0.3V to 6V

DIV to GND .................................... – 0.3V to (V

+ 0.3V)

OE to GND ..................................... – 0.3V to (V

+ 0.3V)

Output Short-Circuit Duration (Note 6) ........... Indefinite

Operating Temperature Range (Note 8)

LTC6905C .......................................... – 40°C to 85°C

LTC6905I ............................................ – 40°C to 85°C

LTC6905H ........................................ – 40°C to 125°C

Specified Temperature Range (Note 8)

LTC6905C ............................................... 0°C to 70°C

LTC6905I ............................................ – 40°C to 85°C

LTC6905H ........................................ – 40°C to 125°C

Storage Temperature Range ................. – 65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

S5 PACKAGE

5-LEAD PLASTIC SOT-23

JMAX

= 125°C,

= 150°C/W

ORDER PART NUMBER

LTC6905CS5-133

LTC6905IS5-133

LTC6905HS5-133

LTC6905CS5-100

LTC6905IS5-100

LTC6905HS5-100

LTC6905CS5-96

LTC6905IS5-96

LTC6905HS5-96

LTC6905CS5-80

LTC6905IS5-80

LTC6905HS5-80

S5 PART MARKING*

LTBPM

LTBPK

LTBPJ

LTBPH

*The temperature grade is identified by a label on the shipping container.

ELECTRICAL CHARACTERISTICS

SYMBOL

∆f

PARAMETER

Frequency Accuracy (Notes 2, 7)

The

●

denotes the specifications which apply over the full specified

temperature range, otherwise specifications are at T

= 25°C or as noted. OE = DIV = V

, V

= 2.7V to 3.6V, R

= 15k, C

= 5pF, unless

otherwise noted. All voltages are with respect to GND.

CONDITIONS

LTC6905C-XXX

= 25°C, V

= 3V

0°C < T

< 70°C

LTC6905I-XXX

25°C < T

< 85°C

– 40°C < T

< 85°C

LTC6905H-XXX

25°C < T

< 125°C

– 40°C < T

< 125°C

= 5V

MIN

TYP

±0.5

●

MAX

±1.0

±1.5

±1.8

±2.9

±2.3

±2.9

UNITS

ppm/°C

%/V

ppm/√kHr

●

±1.5

●

∆f/∆T

∆f/∆V

Freq Drift Over Temp (Note 2)

Freq Drift Over Supply (Notes 2, 7)

Timing Jitter (Note 3)

Long-Term Stability of Output Frequency

Duty Cycle

= 2.7V to 3.6V

±20

0.5

0.8

300

●

47.5

2.7

52.5

5.5

Operating Supply Range

6905xf

W W

LTC6905-XXX Series

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

Power Supply Current

The

●

denotes the specifications which apply over the full specified

temperature range, otherwise specifications are at T

= 25°C or as noted. OE = DIV = V

, V

= 2.7V to 3.6V, R

= 15k, C

= 5pF, unless

otherwise noted. All voltages are with respect to GND.

CONDITIONS

DIV = V

(÷ 1), V

= 3.6V

LTC6905-133

LTC6905-100

LTC6905-96

LTC6905-80

DIV = 0 (÷ 4), V

= 3.6V

LTC6905-133

LTC6905-100

LTC6905-96

LTC6905-80

●

– 0.15

●

MIN

TYP

3.5

MAX

0.2

UNITS

µA

DIV

High Level DIV or OE Pins Input Voltage

Low Level DIV or OE Pins Input Voltage

DIV Input Current (Note 4)

OE Input Current (Note 4)

High Level Output Voltage (Note 4)

DIV = V

DIV = 0V

OE = V

OE = 0V

= 5.5V

= 2.7V

= 5.5V

= – 1mA

= – 4mA

= – 1mA

= – 4mA

= 1mA

= 4mA

= 1mA

= 4mA

●

– 40

– 11

–11

●

5.25

5.20

2.5

2.3

5.45

5.30

2.6

2.5

0.05

0.2

0.1

0.4

0.5

0.25

0.3

0.5

Low Level Output Voltage (Note 4)

= 5.5V

= 2.7V

, t

OUT Rise/Fall Time (Note 5)

Note 1:

Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2:

Frequency accuracy is tested with DIV = V

(÷1). Other divide

ratios are guaranteed by design.

Note 3:

Jitter is the ratio of the peak-to-peak distribution of the period to

the mean of the period. This specification is based on characterization and

is not 100% tested.

Note 4:

To conform with the Logic IC Standard convention, current out of

a pin is arbitrarily given as a negative value.

Note 5:

Output rise and fall times are measured between the 10% and

90% power supply levels.

Note 6:

A heat sink may be required to keep the junction temperature

below the absolute maximum when the output is shorted indefinitely.

Note 7:

The LTC6905 is optimized for the performance with a 3V power

supply voltage. Refer to Typical Performance Characteristics curves in this

data sheet for additional information regarding the LTC6905 voltage

coefficient, especially between 4.5V and 5.5V. Please consult LTC

Marketing for parts optimized for 5V operation.

Note 8:

The LTC6905C-XXX is guaranteed functional over the operating

temperature range and is guaranteed to meet specified performance from

0°C to 70°C. The LTC6905C-XXX is designed, characterized and expected

to meet specified performance from –40°C to 85°C but is not tested or QA

sampled at these temperatures. The LTC6905I-XXX is guaranteed to meet

specified performance from –40°C to 85°C.

6905xf

LTC6905-XXX Series

TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current vs Frequency

SUPPLY CURRENT (mA)

5.5V

2.7V

÷4

÷2

÷1

FREQUENCY ERROR (%)

FREQUENCY (MHz)

6905x G01

OUT

vs V

1.00

1.20

OUTPUT RESISTANCE (Ω)

÷1

PERCENTAGE ERROR (%)

0.20

0.80

JITTER (%)

2.5

3.5

4.5

SUPPLY VOLTAGE (V)

5.5

60 80 100 120 140 160 180

FREQUENCY (MHz)

6905x G05

LTC6905-80 Output Operating at

20MHz, V

= 3V

0.75V/DIV

U W

÷1

100

6905x G04

Frequency Error vs Supply Voltage

2.50

2.00

LTC6905-133

1.50

1.00

0.50

–0.50

LTC6905-100

LTC6905-96

LTC6905-80

2.5

3.5

4.5

SUPPLY VOLTAGE (V)

5.5

6905x G09

150

200

Jitter vs Frequency

1.0

0.8

÷4

÷2

Frequency vs Temperature

0.6

0.4

0.2

–0.2

–0.4

–0.6

–0.8

–1.0

–40 –20

20 40 60 80 100 120

TEMPERATURE (°C)

6905x G08

0.60

0.40

LTC6905-133 Output Operating at

133MHz, V

= 3V

0.75V/DIV

10ns/DIV

6905x G06

2.5ns/DIV

6905x G07

6905xf

LTC6905-XXX Series

PI FU CTIO S

(Pin 1):

Voltage Supply (2.7V

≤

5.5V). This supply

must be kept free from noise and ripple. It should be

bypassed directly to the GND (Pin 2) with a 0.1µF capacitor

or higher.

GND (Pin 2):

Ground. Should be tied to a ground plane for

best performance.

OE (Pin 3):

Output Enable. Pull to V+ or leave floating to

enable the output driver (Pin 5). Pull low to disable the

output. The output is disabled asynchronously. Pulling OE

pin low will immediately disable the output. Pulling the OE

pin high will bring the output high on the next low to high

transition of the clock. This eliminates pulse slivers.

DIV (Pin 4):

Divider-Setting Input. This three-state input

selects among three divider settings. Pin 4 should be tied

to V

for the

÷1

setting, the highest frequency range. Float-

ing Pin 4 divides the master oscillator by 2. Pin 4 should

be tied to GND for the

÷4

setting, the lowest frequency range.

To detect a floating DIV pin, the LTC6905 attempts to pull

the pin toward midsupply. This is realized with two internal

current sources, one tied to V

and Pin 4 and the other one

tied to ground and Pin 4. Therefore, driving the DIV pin high

requires sourcing approximately 15µA. Likewise, driving

DIV low requires sinking 15µA. When Pin 4 is floated, it

should be bypassed by a 1nF capacitor to ground or it should

be surrounded by a ground shield to prevent excessive cou-

pling from other PCB traces.

OUT (Pin 5):

Oscillator Output. This pin can drive 5kΩ

and/or 5pF loads. For heavier loads, refer to the Applica-

tions Information section.

BLOCK DIAGRA

SET

–

GND

–

BIAS

RES

GND

Table 1. LTC6905-XXX Frequency Settings

DIV SETTING

V+

OPEN

GND

LTC6905-133

133.33MHz

66.66MHz

33.33MHz

LTC6905-100

100MHz

50MHz

25MHz

LTC6905-96

96MHz

48MHz

24MHz

LTC6905-80

80MHz

40MHz

20MHz

RES

= 1V

±5%

– V

SET

)

PROGRAMMABLE

DIVIDER

(N = 1, 2 OR 4)

MASTER OSCILLATOR

DIVIDER

SELECT

THREE-STATE

INPUT DETECT

15µA

DIV

OSC

OUT

RES

GAIN = 1

–

15µA

6905x BD

6905xf

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