LTC6908IDCB-2#TRMPBF Linear Technology, LTC6908IDCB-2#TRMPBF Datasheet

IC OSC PREC LP RES SET 6-DFN

LTC6908IDCB-2#TRMPBF

Manufacturer Part Number
LTC6908IDCB-2#TRMPBF
Description
IC OSC PREC LP RES SET 6-DFN
Manufacturer
Linear Technology
Type
Oscillator, Siliconr
Datasheet

Specifications of LTC6908IDCB-2#TRMPBF

Frequency
10MHz
Voltage - Supply
2.7 V ~ 5.5 V
Current - Supply
1.25mA
Operating Temperature
-40°C ~ 85°C
Package / Case
6-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Count
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC6908IDCB-2#TRMPBFLTC6908IDCB-2
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC6908IDCB-2#TRMPBFLTC6908IDCB-2#PBF
Manufacturer:
LT
Quantity:
2 500
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
2.8V TO 5.5V
LTC6908-1: Complementary Outputs (0°/180°)
LTC6908-2: Quadrature Outputs (0°/90°)
50kHz to 10MHz Frequency Range
One External Resistor Sets the Frequency
Optional Spread Spectrum Frequency Modulation
for Improved EMC Performance
±10% Frequency Spreading
400µA Supply Current Typical (V
Frequency Error ≤1.5% Max (T
±40ppm/°C Temperature Stability
Fast Start-Up Time: 260µs Typical (1MHz)
Outputs Muted Until Stable
Operates from a Single 2.7V to 5.5V Supply
Available in Low Profi le (1mm) ThinSOT and DFN
(2mm × 3mm) Packages
Switching Power Supply Clock Reference
Portable and Battery-Powered Equipment
Precision Programmable Oscillator
Charge Pump Driver
44.2k
V
IN
f
OUT
0.1µF
= 10MHz • 10k/R
C
BYP
V
GND
SET
2.25MHz, 2.5V/8A Step-Down Regulator
U
+
LTC6908-1
SET
690812 TA01a
OUT1
OUT2
MOD
A
U
2.2M
= 25°C, V
+
1000pF
= 5V, 50kHz)
41.2k
4.99k
820pF
+
R
RUN/SS
I
SYNC/MODE V
SV
TH
T
= 3V)
IN
LTC3418
TRACK
PGOOD
PGND
SGND
PV
FB
SW
IN
2k
4.32k
DESCRIPTIO
The LTC
provides 2-outputs, shifted by either 180° or 90°. The
oscillator frequency is programmed by a single external
resistor (R
(SSFM) can be activated for improved electromagnetic
compatibility (EMC) performance.
The LTC6908 operates with a single 2.7V to 5.5V supply
and provides rail-to-rail, 50% duty cycle square wave
outputs. A single resistor from 10k to 2M is used to select
an oscillator frequency from 50kHz to 10MHz (5V supply).
The oscillator can be easily programmed using the simple
formula outlined below:
The LTC6908’s SSFM capability modulates the output
frequency by a pseudorandom noise (PRN) signal to
decrease the peak electromagnetic radiation level and
improve EMC performance. The amount of frequency
spreading is fi xed at ±10% of the center frequency. When
SSFM is enabled, the rate of modulation is selected by the
user. The three possible modulation rates are f
f
All other trademarks are the property of their respective owners.
OUT
C
100µF
IN
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
f
OUT
/32 and f
0.2µH
=10MHz • 10k/R
®
6908 is an easy-to-use precision oscillator that
Oscillator with Spread
Spectrum Modulation
SET
LTC6908-1/LTC6908-2
OUT
) and spread spectrum frequency modulation
V
2.5V
8A
C
100µF
×2
OUT
OUT
/64.
Resistor Set SOT-23
U
SET
–10
–20
–30
–40
–10
–20
–30
–40
150kHz
0
0
(FUNDAMENTAL AND HARMONICS SHOWN)
150kHz to 30MHz Output
Frequency Spectrum
(9kHz Res BW)
FREQUENCY
SSFM DISABLED
SSFM ENABLED
690812 TA01b
OUT
690812fa
30MHz
/16,
1

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LTC6908IDCB-2#TRMPBF Summary of contents

Page 1

... When SSFM is enabled, the rate of modulation is selected by the user. The three possible modulation rates are f f /32 and f OUT , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners 100µF SV ...

Page 2

... Output Short Circuit Duration .......................... Indefi nite Operating Temperature Range (Note 2) LTC6908CS6-1/LTC6908CS6-2 ............ –40°C to 85°C LTC6908IS6-1/LTC6908IS6-2 .............. –40°C to 85°C LTC6908HS6-1/LTC6908HS6-2 ......... –40°C to 125°C LTC6908CDCB-1/LTC6908CDCB-2 ...... –40°C to 85°C LTC6908IDCB-1/LTC6908IDCB-2 ......... –40°C to 85°C U PACKAGE/ORDER I FOR ATIO TOP VIEW 6 5 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T noted. The modulation is turned off (MOD is connected to OUT2) unless otherwise specifi ed from the SET pin to the V pin. SYMBOL PARAMETER Δf Frequency Accuracy ...

Page 4

LTC6908-1/LTC6908-2 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: LTC6908C and ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Output Resistance vs Supply Voltage 500 T = 25°C A 450 400 OUTPUT SOURCING CURRENT 350 300 250 200 150 OUTPUT SINKING CURRENT 100 50 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 ...

Page 6

LTC6908-1/LTC6908 CTIO S (DCB Package/S6 Package) SET (Pin 1/Pin 3): Frequency-Setting Resistor Input. The value of the resistor connected between this pin and V determines the oscillator frequency. The voltage on this pin is held ...

Page 7

U OPERATIO As shown in the Block Diagram, the LTC6908’s master oscillator is controlled by the ratio of the voltage between + the V and SET pins and the current entering the SET pin (I ). When the spread spectrum ...

Page 8

LTC6908-1/LTC6908-2 U OPERATIO in conducted EMI results due to the reduced levels of input and output ripple currents. The LTC6908-1 is ideal for use with two single output switching regulators. The quadrature outputs of the LTC6908-2, together with two dual ...

Page 9

U U APPLICATIO S I FOR ATIO SELECTING THE FREQUENCY-SETTING RESISTOR The LTC6908 has an output frequency range spanning 50kHz to 10MHz. However, accuracy may suffer if the oscillator is operated at a frequency greater than 5MHz with a supply ...

Page 10

... SYNC, PLLIN, SYNC/MODE, SHDN, EXTCLK, FCB and S/S (shorthand for SYNC/SHDN) are examples of clock input pin names used with Linear Technology ICs. For the best EMC performance, the LTC6908 should be run with the MOD pin tied to ground (SSFM enabled, modulation rate set to f /16) ...

Page 11

U U APPLICATIO S I FOR ATIO and load response are maintained while peak electromag- netic radiation (or conduction) is reduced. Output ripple may be somewhat increased, but its behavior is very much like noise and its system impact is ...

Page 12

LTC6908-1/LTC6908-2 U TYPICAL APPLICATIO 3.3V C IN1 100µF × SVIN1 SVIN1 1µF 100Ω X7R V IN 2.8V TO 5.5V C BYP + V OUT1 LTC6908-1 0.1µF GND OUT2 90.9k SET MOD f = 10MHz • ...

Page 13

U TYPICAL APPLICATIO S 150kHz FREQUENCY (3MHz/DIV) Figure 8b. Output Frequency Spectrum of Two-Phase Regulator, Figure 8a, with SSFM Disabled 150kHz FREQUENCY (3MHz/DIV) Figure 8c. Output Frequency Spectrum of Two-Phase Regulator, Figure 8a, with SSFM Enabled LTC6908-1/LTC6908-2 RES BW = ...

Page 14

LTC6908-1/LTC6908-2 PACKAGE DESCRIPTIO 1.65 ±0.05 3.55 ±0.05 (2 SIDES) 2.15 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 BAR TOP MARK (SEE NOTE 6) 0.200 REF 14 U DCB Package 6-Lead Plastic DFN (2mm × 3mm) (Reference LTC DWG ...

Page 15

... 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. U ...

Page 16

... High Frequency, 100µs Startup, 7ps RMS Jitter No Trim Components Required 10kHz to 1MHz or 40kHz to 4MHz, 36µA at 400kHz ● www.linear.com Doubling the Output Frequency + V OUT1 LTC6908-2 GND OUT2 NC7SZ86 SET MOD 690812 TA05b SPI Interface LT 0506 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2006 OUT 690812fa ...

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