LTC6900CS5 Linear Technology, LTC6900CS5 Datasheet

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LTC6900CS5

Manufacturer Part Number
LTC6900CS5
Description
Manufacturer
Linear Technology
Type
Silicon Oscillatorr
Datasheet

Specifications of LTC6900CS5

Mounting Style
Surface Mount
Screening Level
Industrial
Product Length (mm)
2.9mm
Product Depth (mm)
1.75mm
Product Height (mm)
0.9mm
Package / Case
TSOT-23
Lead Free Status / RoHS Status
Not Compliant

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APPLICATIO S
FEATURES
TYPICAL APPLICATIO
Portable and Battery-Powered Equipment
PDAs
Cell Phones
Low Cost Precision Oscillator
Charge Pump Driver
Switching Power Supply Clock Reference
Clocking Switched Capacitor Filters
Fixed Crystal Oscillator Replacement
Ceramic Oscillator Replacement
One External Resistor Sets the Frequency
1kHz to 20MHz Frequency Range
500 A Typical Supply Current, V
Frequency Error 1.5% Max, 5kHz to 10MHz
(T
Frequency Error 2% Max, 5kHz to 10MHz
(T
0.04%/V Supply Stability
50% 1% Duty Cycle 1kHz to 2MHz
50% 5% Duty Cycle 2MHz to 10MHz
Fast Start-Up Time: 50 s to 1.5ms
100 CMOS Output Driver
Operates from a Single 2.7V to 5.5V Supply
Low Profile (1mm) ThinSOT
40ppm/ C Temperature Stability
A
A
10k R
= 25 C)
= 0 C to 70 C)
SET
2M
5V
f
OSC
0.1 F
= 10MHz •
U
Clock Generator
N • R
1
2
3
20k
V
GND
SET
LTC6900
+
SET
TM
OUT
DIV
Package
U
5
4
1kHz f
S
N = 1
= 3V, 3MHz
5V, N = 100
OSC
20MHz
OPEN, N = 10
6900 TA01
Resistor Set SOT-23 Oscillator
DESCRIPTIO
The LTC
easy to use and occupies very little PC board space. The
oscillator frequency is programmed by a single external
resistor (R
accuracy operation ( 1.5% frequency error) without the
need for external trim components.
The LTC6900 operates with a single 2.7V to 5.5V power
supply and provides a rail-to-rail, 50% duty cycle square
wave output. The CMOS output driver ensures fast rise/fall
times and rail-to-rail switching. The frequency-setting
resistor can vary from 10k to 2M to select a master
oscillator frequency between 100kHz and 20MHz (5V
supply). The three-state DIV input determines whether the
master clock is divided by 1, 10 or 100 before driving the
output, providing three frequency ranges spanning 1kHz
to 20MHz (5V supply). The LTC6900 features a proprietary
feedback loop that linearizes the relationship between
R
calculate frequency. The oscillator can be easily pro-
grammed using the simple formula outlined below:
ThinSOT is a trademark of Linear Technology Corporation.
f
Low Power, 1kHz to 20MHz
OSC
SET
, LTC and LT are registered trademarks of Linear Technology Corporation.
and frequency, eliminating the need for tables to
10
®
6900 is a precision, low power oscillator that is
MHz
SET
10000
1000
100
10
1
). The LTC6900 has been designed for high
R
1k
SET
DESIRED OUTPUT FREQUENCY (Hz)
N R
vs Desired Output Frequency
10k
100
U
20
k
SET
100k
10
,
N
1M
1
10M
100
10
1
,
,
6900 F02
,
LTC6900
100M
DIV Pin V
DIV Pin
DIV Pin GND
Open
1
6900f

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LTC6900CS5 Summary of contents

Page 1

... SET calculate frequency. The oscillator can be easily pro- grammed using the simple formula outlined below OSC , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. 1kHz f 20MHz OSC 5 5V 100 ...

Page 2

... OSC + R = 20k, Pin SET 10MHz OSC + + Pin Pin ORDER PART NUMBER LTC6900CS5 5 OUT LTC6900IS5 4 DIV S5 PART MARKING LTZM = 256 C 5pF, Pin unless otherwise noted. L MIN TYP MAX UNITS 0.5 1.5 2.0 2 0.5 1.5 2.0 2 400 20 400 0.004 0.04 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T All voltages are with respect to GND. SYMBOL PARAMETER V High Level Output Voltage (Note Low Level Output Voltage (Note OUT Rise Time r (Note ...

Page 4

LTC6900 W U TYPICAL PERFOR A CE CHARACTERISTICS Frequency Variation vs R SET GUARANTEED LIMITS APPLY OVER 20k R 400k SET 2 TYPICAL HIGH 1 0 –1 TYPICAL LOW –2 –3 –4 1k ...

Page 5

CTIO (Pin 1): Voltage Supply (2.7V V must be kept free from noise and ripple. It should be bypassed directly to a ground plane with a 0.1 F capacitor. GND (Pin 2): ...

Page 6

LTC6900 THEORY OF OPERATIO As shown in the Block Diagram, the LTC6900’s master oscillator is controlled by the ratio of the voltage between + the V and SET pins and the current (I SET pin. The voltage on the SET ...

Page 7

U U APPLICATIO S I FOR ATIO SELECTING THE DIVIDER SETTING AND RESISTOR The LTC6900’s master oscillator has a frequency range spanning 0.1MHz to 20MHz. However, accuracy may suffer if the master oscillator is operated at greater than 10MHz with ...

Page 8

LTC6900 U U APPLICATIO S I FOR ATIO POWER SUPPLY REJECTION Low Frequency Supply Rejection (Voltage Coefficient) Figure 5 shows the output frequency sensitivity to power supply voltage at several different temperatures. The LTC6900 has a guaranteed voltage coefficient of ...

Page 9

U U APPLICATIO S I FOR ATIO OUT OR LTC6900 SET1 GND f 100 R SET2 SET DIV 1 6900 F07 Figure 7 A ...

Page 10

LTC6900 U U APPLICATIO S I FOR ATIO Once known, calculate R IN SET 10 MHz • • SET N f OSC MAX ( ) MAX ( ) ...

Page 11

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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. W ...

Page 12

... YSI 44011 800 765-4974 T Output Frequency vs Temperature 1400 MAX TYP 1200 MIN 1000 800 600 400 200 0 –20 – TEMPERATURE ( C) 6900 TA03 COMMENTS Identical Pinout, Higher Frequency Operation www.linear.com 10MHz 20k = • LT/TP 0902 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2002 6900f ...

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