LTC6903 Linear Technology, LTC6903 Datasheet

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LTC6903

Manufacturer Part Number
LTC6903
Description
(LTC6903 / LTC6904) 1kHz - 68MHz Serial Port Programmable Oscillator
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIO S
5V
TYPICAL APPLICATIO
0.1 F
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
–40 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
U
RC2/CCP1
RC5/SDO
U
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
0.01 F
DESCRIPTIO
The LTC
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:
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
U.S. Patent Numbers 6342817 and 6614313.
2
C compatible interface.
6903 TA01
, LTC and LT are registered trademarks of Linear Technology Corporation.
f
1 F
2
OCT
®
6903/LTC6904 are low power self contained
2078
2
1kHz - 68MHz Serial
40
30
20
10
1024
0
–1.0
DAC
U
LTC6903/LTC6904
( )
Hz
V
T
f = 1039Hz
443
UNITS
TESTED
A
S
= 3V
= 25 C
LTC6903 Frequency Error
;
–0.5
1
FREQUENCY ERROR (%)
kHz f
Distribution
0
68
MHz
www.DataSheet4U.com
0.5
6903 TA01b
1.0
69034fa
1

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LTC6903 Summary of contents

Page 1

... OCT f 2 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 compatible interface. , LTC and LT are registered trademarks of Linear Technology Corporation. ...

Page 2

... Operating Temperature Range (Note 3) LTC6903CMS8/LTC6904CMS8 ........... – LTC6903IMS8/LTC6904IMS8 ............. – LTC6903HMS8/LTC6904HMS8 ......... – 125 C Specified Temperature Range (Note 4) LTC6903CMS8/LTC6904CMS8 ........... – LTC6903IMS8/LTC6904IMS8 ............. – LTC6903HMS8/LTC6904HMS8 ......... – 125 C Storage Temperature Range .................. – 150 C Lead Temperature (Soldering, 10sec)................... 300 C ...

Page 3

... SEN, SCK, SDI Pins I Digital Input Leakage IN SEN, SCK, SDI Pins CHARACTERISTICS range, otherwise specifications are at T SYMBOL PARAMETER LTC6903 (Notes Serial Port Clock Frequency SCK t Min Clock High Time CKHI t Min Clock Low Time CKLO t Min Setup Time - SDI to SCK ...

Page 4

... Note 3: The LTC6903CMS8, LTC6904CMS8, LTC6903IMS8, and LTC6904IMS8 are guaranteed functional over the operating temperature range of – The LTC6903HMS8 and LTC6904HMS8 are guaranteed functional over the extended operating temperature range of – 125 C. ...

Page 5

... 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 0.1 F capacitor. Additional bypass may be necessary for operation at high 2 C frequency or under larger loads. LTC6903/LTC6904 Output Resistance vs Supply Voltage ...

Page 6

... Higher VCO frequencies and lower output divider settings can result in higher output jitter. Random jitter at the lower U U APPLICATIO S I FOR ATIO Frequency Setting Information The frequency output of the LTC6903/LTC6904 is deter- mined by the following equation: 2078 ( ) Hz OCT f 2 • ...

Page 7

... Adequate bypass capacitor in parallel with a 0.01 F capacitor connected within a few millimeters of the power supply leads. Monotonicity and Linearity The DAC in the LTC6903/LTC6904 is guaranteed to be 10-bit monotonic. Nonlinearity of the DAC is less than 1%. LTC6903/LTC6904 69034fa 7 ...

Page 8

... At frequencies above 1MHz, attention should be paid to minimize the capacitive load on the CLK and CLK pins. The LTC6903/LTC6904 is designed to drive up to 5pF on each output with no degradation in accuracy. 5pF is equivalent to one to two HC series logic inputs. A standard 10x oscilloscope probe usually presents between 10pF and 15pF of capacitive load ...

Page 9

... Frequency Setting Section) CNF[1:0] - Output Configuration - This controls outputs CLK and CLK according to Table 2. LTC6903 SPI Compatible Interface A serial data transfer is composed of sixteen (16) bits of data labeled D15 through D0. D15 is the first bit of data presented in each transaction. All serial port register bits are set LOW on power-up ...

Page 10

... LTC6903/LTC6904 U TYPICAL APPLICATIO S 2 LTC6904 I C Interface The LTC6904 communicates with a host (master) using 2 the standard I C 2-wire interface. The Timing Diagram shows the timing relationship of the signals on the bus. The two bus lines, SDA and SCL, must be high when the bus is not in use ...

Page 11

... BSC 4.90 0.152 DETAIL “A” (.193 .006) 0 – 6 TYP 0.53 0.152 1.10 (.021 .006) (.043) DETAIL “A” MAX SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP LTC6903/LTC6904 0.52 (.0205 REF 3.00 0.102 (.118 .004) (NOTE 0.86 (.034) REF 0.127 0.076 (.005 .003) ...

Page 12

... Wide Range Time Interval Generator (1.97 Seconds to 4 Microseconds) 1 < TRIGGER PULSE WIDTH < OUTPUT PULSE WIDTH f CLK TRIG + GND SDI SDI OE U6 LTC6903 3 6 SCK SCK CLK f CLK 4 5 SEN SEN CLK MUX SELECT ADDRESS LINES S2 RELATED PARTS PART NUMBER DESCRIPTION LTC1799 1kHz to 30MHz ThinSOT™ ...

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