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PDF LTC6903 Data sheet ( Hoja de datos )
| Número de pieza | LTC6903 | |
| Descripción | (LTC6903 / LTC6904) 1kHz - 68MHz Serial Port Programmable Oscillator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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( 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
10Ω
0.01µF
1µF
6903 TA01
www.DataSheet4U.com
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 (%)
www.DataSheet4U.com
6903 TA01b
69034fa
1
1 page  
LTC6903/LTC6904
TYPICAL PERFOR A CE CHARACTERISTICS
Peak-to-Peak Jitter vs Frequency
10 V+ = 3V
1
0.1
0.01
0.1
1 10
FREQUENCY (MHz)
100
6903 G04
Supply Current vs Output
Frequency
10
9
8
7
6
5
4 V+ = 5V
3
2 V+ = 3V
1
0
0.001
0.01 0.1 1 10
FREQUENCY (MHz)
100
6903 G05
Output Spectrum at 20MHz
20
Output Waveform at 68MHz
0
Output Resistance vs Supply
Voltage
60
50
40
30
20
10
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
6903 G06
Output Waveform at 20MHz
–80
15MHz
20MHz
25MHz
6903 G07
CL = 10pF
V+ = 3V
5ns/DIV
3468 G08
CL = 10pF
V+ = 3V
10ns/DIV
3468 G09
PI FU CTIO S
GND (Pin 1): Negative Power Supply (Ground). Should be
tied directly to a ground plane for best performance.
SDI ( Pin 2 ): Serial Data Input. Data for serial transfer is
presented on this pin.
SCK (Pin 3): Serial Port Clock. Input, positive edge trig-
gered. Clocks serial data in on rising edge.
SEN (Pin 4): Serial Port Enable (6903 Only). Input, active
LOW. Initiates serial transaction when brought LOW,
finalizes transaction when brought HIGH after 16 clocks.
ADR (Pin 4): Serial Port Address (6904 Only). Sets the I2C
serial port address.
CLK (Pin 5): Auxiliary Clock Output. Frequency set by
serial port.
CLK (Pin 6): Main Clock Output. Frequency set by serial
port.
OE (Pin 7): Asynchronous Output Enable. CLK and CLK are
set LOW when this pin is LOW.
V+ (Pin 8): Positive Power Supply. This supply must be
kept free from noise and ripple. It should be bypassed
directly to a ground plane with a quality 0.1µF capacitor.
Additional bypass may be necessary for operation at high
frequency or under larger loads.
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5 Page 
PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
LTC6903/LTC6904
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.42 ± 0.038
(.0165 ± .0015)
TYP
0.65
(.0256)
BSC
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
8 7 65
0.52
(.0205)
REF
0.254
(.010)
DETAIL “A”
0° – 6° TYP
4.90 ± 0.152
(.193 ± .006)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
GAUGE PLANE
0.18
(.007)
0.53 ± 0.152
(.021 ± .006)
DETAIL “A”
1 234
1.10
(.043)
MAX
SEATING
PLANE
0.22 – 0.38
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
(.009 – .015)
TYP 0.65
(.0256)
BSC
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.86
(.034)
REF
0.127 ± 0.076
(.005 ± .003)
MSOP (MS8) 0204
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.
69034fa
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC6903.PDF ] | |
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