Programmable Oscillator. LTC6903 Datasheet

LTC6903 Oscillator. Datasheet pdf. Equivalent

Part LTC6903
Description (LTC6903 / LTC6904) 1kHz - 68MHz Serial Port Programmable Oscillator
Feature ( DataSheet : www.DataSheet4U.com ) LTC6903/LTC6904 1kHz - 68MHz Serial Port Programmable Oscillato.
Manufacture Linear Technology
Datasheet
Download LTC6903 Datasheet

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Recommendation Recommendation Datasheet LTC6903 Datasheet




LTC6903
( DataSheet : www.DataSheet4U.com )
LTC6903/LTC6904
1kHz - 68MHz Serial
Port Programmable Oscillator
FEATURES
s 1kHz to 68MHz Square Wave Output
s 0.5% (Typ) Initial Frequency Accuracy
s Frequency Error <1.1% Over All Settings
s 10ppm/°C Typical Frequency Drift Over
Temperature
s 0.1% Resolution
s 1.7mA Typical Supply Current (f < 1MHz, VS = 2.7V)
s 2.7V to 5.5V Single Supply Operation
s Jitter <0.4% Typical 1kHz to 8MHz
s Easy to Use SPI (LTC6903) or I2C (LTC6904) Serial
Interface
s Output Enable Pin
s –40°C to 125°C Operation
s MS8 Package
U
APPLICATIO S
s Precision Digitally Controlled Oscillator
s Power Management
s Direct Digital Frequency Synthesis (DDS)
Replacement
s Replacement for DAC and VCO
s Switched Capacitor Filter Clock
DESCRIPTIO
The LTC®6903/LTC6904 are low power self contained
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:
f
=
2OCT
2078(Hz)
2 – 1D0A2C4
;1kHz
<
f
<
68MHz
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
I2C compatible interface.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U.S. Patent Numbers 6342817 and 6614313.
TYPICAL APPLICATIO
10k
5V
0.1µF
A Microcontroller Controlling Its Clock
MICROCONTROLLER
OSC1/CLKIN
OSC2/CLKOUT
MCLR/VP–P RC5/SDO
RC3/SCK/SCL
VDD RC2/CCP1
VSS
VSS
PIC16F73
5V
GND V+
SDI
LTC6903
OE
SCK CLK
SEN CLK
POWER-UP CLOCK
FREQUENCY IS 1039Hz
10
0.01µF
1µF
6903 TA01
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LTC6903 Frequency Error
Distribution
40 VS = 3V
TA = 25°C
f = 1039Hz
30
443
UNITS
TESTED
20
10
0
–1.0 –0.5
0
0.5 1.0
FREQUENCY ERROR (%)
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6903 TA01b
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LTC6903
LTC6903/LTC6904
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to GND) .............................. 6V
Maximum Voltage on any Pin
........................... (GND – 0.3V) VPIN (V+ + 0.3V)
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 .................. –65°C to 150°C
Lead Temperature (Soldering, 10sec)................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
GND 1
SDI 2
SCK 3
SEN/ADR* 4
TOP VIEW
8 V+
7 OE
6 CLK
5 CLK
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 200°C/W
LTC6903CMS8
LTC6903IMS8
LTC6903HMS8
LTC6904CMS8
LTC6904IMS8
LTC6904HMS8
MS8 PART MARKING*
* SEN (LTC6903)
ADR (LTC6904)
LTABN
LTAES
*The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V+ = 2.7V to 5.5V, GND = 0V, unless otherwise noted.
SYMBOL
fi
f
fMAX
fMIN
f/T
f/V
ROUT
VOH
VOL
PARAMETER
Initial Frequency Accuracy
Total Frequency Accuracy (Note 7)
Maximum Operating Frequency
Minimum Operating Frequency
Frequency Drift Over Temperature
Frequency Drift Over Supply
Long Term Frequency Stability
Timing Jitter
(See Graph)
Duty Cycle
Output Resistance
High Level Output Voltage
Low Level Output Voltage
CONDITIONS
f = 1.039kHz, V+ = 3V, CLOAD = 5pF
Single Output Active:
Over All Settings, V+ = 2.7V, CLOAD = 5pF
Over All Settings, V+ = 5.5V, CLOAD = 5pF
LTC6903CMS8, LTC6904CMS8:
Over All Settings, V+ = 2.7V, CLOAD = 5pF
Over All Settings, V+ = 5.5V, CLOAD = 5pF
LTC6903HMS8, LTC6903IMS8,
LTC6904HMS8, LTC6904IMS8:
Over All Settings, V+ = 2.7V, CLOAD = 5pF
Over All Settings, V+ = 5.5V, CLOAD = 5pF
1.039kHz to 8.5MHz
1.039kHz to 68MHz
1.039kHz to 1MHz
1.039kHz to 68MHz
CLK, CLK Pins, V+ = 2.7V
V+ = 5.5V, 4mA Load
V+ = 2.7V, 4mA Load
V+ = 5.5V, 1mA Load
V+ = 2.7V, 1mA Load
V+ = 5.5V, 4mA Load
V+ = 2.7V, 4mA Load
V+ = 5.5V, 1mA Load
V+ = 2.7V, 1mA Load
MIN
q
q
q
q
q 49
q 4.8
q2
q 5.2
q 2.3
q
q
q
q
TYP MAX
±0.75
0.5 1.1
0.5 1.6
0.5 1.65
0.5 2
UNITS
%
%
%
%
%
0.5 1.9
0.5 2.2
%
%
68 MHz
1.039
kHz
10 ppm/°C
0.05 %/V
300 ppm/kHr
0.4 %
1%
50 51
50
%
%
45
5.3 V
2.3 V
5.45 V
2.55 V
0.15 0.3
0.25 0.45
V
V
0.05 0.15
0.05 0.2
V
V
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