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LTC6903IMS8 Datasheet

  • LTC6903IMS8

  • 1kHz - 68MHz Serial Port Programmable Oscillator

  • 12頁(yè)

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LTC6903/LTC6904
1kHz - 68MHz Serial
Port Programmable Oscillator
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
1kHz to 68MHz Square Wave Output
0.5% (Typ) Initial Frequency Accuracy
Frequency Error <1.1% Over All Settings
10ppm/擄C Typical Frequency Drift Over
Temperature
0.1% Resolution
1.7mA Typical Supply Current (f < 1MHz, V
S
= 2.7V)
2.7V to 5.5V Single Supply Operation
Jitter <0.4% Typical 1kHz to 8MHz
Easy to Use SPI (LTC6903) or I
2
C (LTC6904) Serial
Interface
Output Enable Pin
鈥?0擄C to 125擄C Operation
MS8 Package
The LTC
廬
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:
2078(Hz)
f
=
2
OCT
鈥?/div>
;1kHz
<
f
<
68MHz
DAC
錚?/div>
錚?/div>
錚?/div>
2 鈥?/div>
錚?/div>
錚?/div>
1024
錚?/div>
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
2
C compatible interface.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U.S. Patent Numbers 6342817 and 6614313.
APPLICATIO S
s
s
s
s
s
Precision Digitally Controlled Oscillator
Power Management
Direct Digital Frequency Synthesis (DDS)
Replacement
Replacement for DAC and VCO
Switched Capacitor Filter Clock
TYPICAL APPLICATIO
A Microcontroller Controlling Its Clock
40
5V
MICROCONTROLLER
OSC1/CLKIN
OSC2/CLKOUT
MCLR/V
P鈥揚(yáng)
RC5/SDO
RC3/SCK/SCL
RC2/CCP1
GND
SDI
LTC6903
SCK
SEN
CLK
1碌F
CLK
0.01碌F
PIC16F73
POWER-UP CLOCK
FREQUENCY IS 1039Hz
0
鈥?.0
10
V
+
OE
10鈩?/div>
V
S
= 3V
T
A
= 25擄C
f = 1039Hz
443
30 UNITS
TESTED
10k
UNITS
20
5V
0.1碌F
V
DD
V
SS
V
SS
6903 TA01
U
LTC6903 Frequency Error
Distribution
0
0.5
鈥?.5
FREQUENCY ERROR (%)
1.0
6903 TA01b
U
U
69034fa
1

LTC6903IMS8 產(chǎn)品屬性

  • LTC6903-04

  • 50

  • 集成電路 (IC)

  • 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器

  • -

  • 振蕩器 - 硅

  • -

  • 1kHz ~ 68MHz

  • 2.7 V ~ 5.5 V

  • 7mA

  • -40°C ~ 85°C

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）

  • 管件

  • 8-MSOP

  • 表面貼裝

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