LTC6903CMS8#TRPBF Linear Technology, LTC6903CMS8#TRPBF Datasheet

IC OSC PROGRAM SPI SERIAL 8-MSOP

LTC6903CMS8#TRPBF

Manufacturer Part Number
LTC6903CMS8#TRPBF
Description
IC OSC PROGRAM SPI SERIAL 8-MSOP
Manufacturer
Linear Technology
Type
Oscillator, Siliconr
Datasheet

Specifications of LTC6903CMS8#TRPBF

Frequency
68MHz
Voltage - Supply
2.7 V ~ 5.5 V
Current - Supply
7mA
Operating Temperature
-40°C ~ 85°C
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Count
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC6903CMS8#TRPBFLTC6903CMS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC6903CMS8#TRPBF
Manufacturer:
FOXCONN
Quantity:
1 000
FeaTures
applicaTions
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Typical applicaTion
0.1µF
5V
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
–55°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
RC2/CCP1
RC5/SDO
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
10
0.01µF
DescripTion
The LTC
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 set-
ting 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
L, LT, LTC, 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.
2
C compatible interface.
6903 TA01
f
=
1µF
2
®
OCT
6903/LTC6904 are low power self contained digital
 
2078
2
1kHz – 68MHz Serial
40
30
20
10
1024
0
–1.0
DAC
LTC6903/LTC6904
( )
V
T
f = 1039Hz
443
UNITS
TESTED
Hz
S
A
= 25°C
= 3V
 
LTC6903 Frequency Error
;
–0.5
1
FREQUENCY ERROR (%)
kHz f
Distribution
< <
0
68
MHz
0.5
6903 TA01b
1.0
69034fc


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LTC6903CMS8#TRPBF Summary of contents

Page 1

... The LTC6903 is controlled by a convenient SPI compatible serial interface. The LTC6904 uses an industry standard compatible interface. L, LT, LTC, 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

... LTC6903IMS8/LTC6904IMS8 ............... –40°C to 85°C LTC6903HMS8/LTC6904HMS8 .......... –40°C to 125°C Storage Temperature Range ................... –65°C to 150°C Lead Temperature (Soldering, 10sec) ................... 300°C orDer inFormaTion LEAD FREE FINISH TAPE AND REEL LTC6903CMS8#PBF LTC6903CMS8#TRPBF LTC6903IMS8#PBF LTC6903IMS8#TRPBF LTC6903HMS8#PBF LTC6903HMS8#TRPBF LTC6904CMS8#PBF LTC6904CMS8#TRPBF LTC6904IMS8#PBF LTC6904IMS8#TRPBF ...

Page 3

T SYMBOL PARAMETER f Minimum Operating Frequency MIN ∆f/∆T Frequency Drift Over Temperature Frequency Drift Over Supply ∆f/∆V Long-Term Frequency Stability Timing Jitter (See Graph) Duty Cycle R Output Resistance OUT V ...

Page 4

LTC6903/LTC6904 Timing characTerisTics range, otherwise specifications are at T SYMBOL PARAMETER t Min Clock Low Time CKLO t Min Setup Time – SDI to SCK su t Min Hold Time – SCK to SDI hLD t Min Latch Time – ...

Page 5

Typical perFormance 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 25MHz 6903 G07 pin FuncTions GND (Pin 1): Negative ...

Page 6

LTC6903/LTC6904 block Diagram + – DAC Theory oF operaTion The LTC6903/LTC6904 contain an internal feedback loop which controls a high frequency square wave VCO oper- ating between 34MHz and 68MHz. The internal feedback loop frequency is set ...

Page 7

Table 1. Output Frequency Range vs OCT Settling (Frequency Resolution 0.001 • ≥ f < 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 66.5kHz 132.9kHz 33.25kHz ...

Page 8

LTC6903/LTC6904 applicaTions inFormaTion 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 of “1100” will always be ...

Page 9

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 CLK according to Table 2. LTC6903 ...

Page 10

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

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

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

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