參數(shù)資料
型號(hào)： LTC6904MPMS8#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 1/14頁(yè)
文件大?。?/td> 0K
描述： IC OSC SILICON 68MHZ 8MSOP
標(biāo)準(zhǔn)包裝： 50
類型： 振蕩器 - 硅
頻率： 1kHz ~ 68MHz
電源電壓： 2.7 V ~ 5.5 V
電流 - 電源： 7mA
工作溫度： -55°C ~ 125°C
封裝/外殼： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
包裝： 管件
供應(yīng)商設(shè)備封裝： 8-MSOP
安裝類型： 表面貼裝
LTC6903/LTC6904
1
69034fe
Typical applicaTion
FeaTures
applicaTions
DescripTion
1kHz to 68MHz Serial
Port Programmable Oscillator
TheLTC6903/LTC6904arelowpowerselfcontaineddigital
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.
TheLTC6903/LTC6904featureaproprietaryfeedbackloop
that linearizes the relationship between digital control set-
ting and frequency, resulting in a very simple frequency
setting equation:
f
Hz
DAC
kHzf
MHz
OCT
=
<<
2
2078
2
1024
168
()
–
;
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.
A Microcontroller Controlling Its Clock
n
Precision Digitally Controlled Oscillator
n
Power Management
n
Direct Digital Frequency Synthesis (DDS)
Replacement
n
Replacement for DAC and VCO
n
Switched Capacitor Filter Clock
n
1kHz to 68MHz Square Wave Output
n
0.5% (Typ) Initial Frequency Accuracy
n
Frequency Error <1.1% Over All Settings
n
10ppm/°C Typical Frequency Drift Over
Temperature
n
0.1% Resolution
n
1.7mA Typical Supply Current (f < 1MHz, VS = 2.7V)
n
2.7V to 5.5V Single- Supply Operation
n
Jitter <0.4% Typical 1kHz to 8MHz
n
Easy to Use SPI (LTC6903) or I2C (LTC6904) Serial
Interface
n
Output Enable Pin
n
–55°C to 125°C Operation
n
MS8 Package
PIC16F73
MICROCONTROLLER
VDD
VSS
RC2/CCP1
VSS
RC5/SDO
RC3/SCK/SCL
LTC6903
0.01F
GND
SDI
SCK
SEN
POWER-UP CLOCK
FREQUENCY IS 1039Hz
V+
5V
10
10k
5V
OE
CLK
69034 TA01
CLK
OSC2/CLKOUT
OSC1/CLKIN
MCLR/VP–P
1F
0.1F
FREQUENCY ERROR (%)
–1.0
UNITS
40
30
20
10
0
–0.5
69034 TA01b
0
0.5
1.0
VS = 3V
TA = 25°C
f = 1039Hz
443
UNITS
TESTED
LTC6903 Frequency Error
Distribution
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 6342817 and 6614313.
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