LTC6904HMS8 Linear Technology, LTC6904HMS8 Datasheet

IC OSC PROG I2C DIG LO PWR 8MSOP

LTC6904HMS8

Manufacturer Part Number
LTC6904HMS8
Description
IC OSC PROG I2C DIG LO PWR 8MSOP
Manufacturer
Linear Technology
Type
Oscillator, Siliconr
Datasheets

Specifications of LTC6904HMS8

Frequency
68MHz
Voltage - Supply
2.7 V ~ 5.5 V
Current - Supply
7mA
Operating Temperature
-40°C ~ 125°C
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Count
-
Lead Free Status / Rohs Status
Not Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC6904HMS8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC6904HMS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIO S
5V
TYPICAL APPLICATIO
0.1μF
10k
1kHz to 68MHz Square Wave Output
0.5% (Typ) Initial Frequency Accuracy
Frequency Error <1.1% Over All Settings
10ppm/°C Typical Frequency Drift Over
Temperature
0.1% Resolution
1.7mA Typical Supply Current (f < 1MHz, V
2.7V to 5.5V Single Supply Operation
Jitter <0.4% Typical 1kHz to 8MHz
Easy to Use SPI (LTC6903) or I
Interface
Output Enable Pin
–40°C to 125°C Operation
MS8 Package
Precision Digitally Controlled Oscillator
Power Management
Direct Digital Frequency Synthesis (DDS)
Replacement
Replacement for DAC and VCO
Switched Capacitor Filter Clock
OSC1/CLKIN
OSC2/CLKOUT
MCLR/V
V
V
V
MICROCONTROLLER
DD
SS
SS
PIC16F73
A Microcontroller Controlling Its Clock
P–P
RC3/SCK/SCL
U
RC2/CCP1
RC5/SDO
U
2
C (LTC6904) Serial
GND
SDI
SCK
SEN
POWER-UP CLOCK
FREQUENCY IS 1039Hz
LTC6903
S
= 2.7V)
CLK
CLK
OE
V
+
Port Programmable Oscillator
5V
10Ω
0.01μF
DESCRIPTIO
The LTC
digital frequency sources providing a precision frequency
from 1kHz to 68MHz, set through a serial port. The
LTC6903/LTC6904 require no external components other
than a power supply bypass capacitor, and they operate
over a single wide supply range of 2.7V to 5.5V.
The LTC6903/LTC6904 feature a proprietary feedback
loop that linearizes the relationship between digital control
setting and frequency, resulting in a very simple frequency
setting equation:
Where OCT is a 4-bit digital code and DAC is a 10-bit digital
code.
The LTC6903 is controlled by a convenient SPI compatible
serial interface. The LTC6904 uses an industry standard
I
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 6342817 and 6614313.
2
C compatible interface.
6903 TA01
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
f
=
1μF
2
OCT
®
6903/LTC6904 are low power self contained
2078
2
1kHz - 68MHz Serial
40
30
20
10
1024
0
–1.0
DAC
U
LTC6903/LTC6904
( )
Hz
V
T
f = 1039Hz
443
UNITS
TESTED
A
S
= 3V
= 25°C
LTC6903 Frequency Error
;
–0.5
1
FREQUENCY ERROR (%)
kHz f
Distribution
< <
0
68
MHz
0.5
6903 TA01b
1.0
69034fb
1

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LTC6904HMS8 Summary of contents

Page 1

... The LTC6903 is controlled by a convenient SPI compatible serial interface. The LTC6904 uses an industry standard compatible interface. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6342817 and 6614313 ...

Page 2

... Output Short Circuit Duration (Note 2) ............ Indefinite Operating Temperature Range (Note 3) LTC6903CMS8/LTC6904CMS8 ........... –40°C to 85°C LTC6903IMS8/LTC6904IMS8 ............. –40°C to 85°C LTC6903HMS8/LTC6904HMS8 ......... –40°C to 125°C Specified Temperature Range (Note 4) LTC6903CMS8/LTC6904CMS8 ........... –40°C to 85°C LTC6903IMS8/LTC6904IMS8 ............. –40°C to 85°C LTC6903HMS8/LTC6904HMS8 ......... –40°C to 125°C Storage Temperature Range .................. – ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER t Output Rise Time (10 Output Fall Time (10 POWER REQUIRE E TS range, otherwise specifications are at T SYMBOL ...

Page 4

... Note 3: The LTC6903CMS8, LTC6904CMS8, LTC6903IMS8, and LTC6904IMS8 are guaranteed functional over the operating temperature range of –40°C to 85°C. The LTC6903HMS8 and LTC6904HMS8 are guaranteed functional over the extended operating temperature range of –40°C to 125°C. ...

Page 5

W TYPICAL PERFOR A CE CHARACTERISTICS Peak-to-Peak Jitter vs Frequency 0.1 0.01 0 FREQUENCY (MHz) 6903 G04 Output Spectrum at 20MHz 20 0 –80 15MHz 20MHz 6903 G07 ...

Page 6

LTC6903/LTC6904 W BLOCK DIAGRA + – THEORY OF OPERATIO The LTC6903/LTC6904 contain an internal feedback loop which controls a high frequency square wave VCO operat- ing between 34MHz and 68MHz. The internal feedback loop frequency is set over an octave ...

Page 7

U U APPLICATIO S I FOR ATIO Table 1. Output Frequency Range vs OCT Setting (Frequency Resolution 0.001 • ≥ 34.05MHz 68.03MHz 17.02MHz 34.01MHz 8.511MHz 17.01MHz 4.256MHz 8.503MHz 2.128MHz 4.252MHz 1.064MHz 2.126MHz 532kHz 1063kHz 266kHz 531.4kHz 133kHz 265.7kHz ...

Page 8

LTC6903/LTC6904 U U APPLICATIO S I FOR ATIO Additionally, the LTC6903/LTC6904 is guaranteed to be monotonic when switching between octaves with the OCT setting bits. For example, the frequency output with a DAC setting of “1111111111” and an OCT setting ...

Page 9

U U APPLICATIO S I FOR ATIO Serial Port Register Description OCT[3:0] - Frequency Divider Setting. (See Frequency Setting Section) DAC[9:0] - Master Oscillator Frequency Setting. (See Frequency Setting Section) CNF[1:0] - Output Configuration - This controls outputs CLK and ...

Page 10

LTC6903/LTC6904 U TYPICAL APPLICATIO S 2 LTC6904 I C Interface The LTC6904 communicates with a host (master) using 2 the standard I C 2-wire interface. The Timing Diagram shows the timing relationship of the signals on the bus. The two ...

Page 11

... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... PART NUMBER DESCRIPTION LTC1799 1kHz to 30MHz ThinSOT™ Oscillator LTC6900 1kHz to 20MHz ThinSOT Oscillator LTC6902 Multiphase Oscillator with Spread Spectrum Modulation ThinSOT is a trademark of Linear Technology Corporation Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● + ...

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