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Linear Technology Electronic Components Datasheet

LTC6908-1 Datasheet

Resistor Set SOT-23 Oscillator

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FEATURES
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+ = 5V, 50kHz)
Frequency Error ≤1.5% Max (TA = 25°C, V+ = 3V)
±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 Profile (1mm) ThinSOT and DFN
(2mm × 3mm) Packages
U
APPLICATIO S
Switching Power Supply Clock Reference
Portable and Battery-Powered Equipment
Precision Programmable Oscillator
Charge Pump Driver
LTC6908-1/LTC6908-2
Resistor Set SOT-23
Oscillator with Spread
Spectrum Modulation
DESCRIPTIO
The LTC®6908 is an easy-to-use precision oscillator that
provides 2-outputs, shifted by either 180° or 90°. The
oscillator frequency is programmed by a single external
resistor (RSET) and spread spectrum frequency modulation
(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:
fOUT =10MHz • 10k/RSET
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 fixed 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 fOUT/16,
fOUT/32 and fOUT/64.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
2.25MHz, 2.5V/8A Step-Down Regulator
VIN
2.8V TO 5.5V
CBYP
0.1µF
V+ OUT1
LTC6908-1
GND OUT2
44.2k
SET MOD
690812 TA01a
fOUT = 10MHz • 10k/RSET
2.2M
1000pF
41.2k
4.99k
SVIN TRACK PVIN
RT SW
LTC3418
PGOOD
RUN/SS PGND
ITH SGND
SYNC/MODE VFB
820pF
4.32k
CIN
100µF
0.2µH
2k
VOUT
2.5V
8A
COUT
100µF
×2
150kHz to 30MHz Output
Frequency Spectrum
(9kHz Res BW)
0
SSFM DISABLED
–10
–20
–30
–40
0
SSFM ENABLED
–10
–20
–30
–40
150kHz
FREQUENCY
30MHz
(FUNDAMENTAL AND HARMONICS SHOWN)
690812 TA01b
690812fa
1


Linear Technology Electronic Components Datasheet

LTC6908-1 Datasheet

Resistor Set SOT-23 Oscillator

No Preview Available !

wwwL.DTataCShe6et49U.c0om8-1/LTC6908-2
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to GND) ...............................6V
Maximum Voltage on any Pin
(GND – 0.3V) ≤ VPIN ≤ (V+ + 0.3V)
Output Short Circuit Duration .......................... Indefinite
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
Specified Temperature Range (Note 3)
LTC6908CS6-1/LTC6908CS6-2................ 0°C to 70°C
LTC6908IS6-1/LTC6908IS6-2 .............. –40°C to 85°C
LTC6908HS6-1/LTC6908HS6-2 ......... –40°C to 125°C
LTC6908CDCB-1/LTC6908CDCB-2 .......... 0°C to 70°C
LTC6908IDCB-1/LTC6908IDCB-2......... –40°C to 85°C
Storage Temperature Range (S6)........... –65°C to 150°C
Storage Temperature Range (DCB) ........ –65°C to 125°C
Lead Temperature (Soldering, 10sec) ................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
654
7
V+ 1
GND 2
SET 3
TOP VIEW
6 OUT1
5 OUT2
4 MOD
123
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 64°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 230°C/W
ORDER PART NUMBER DCB PART MARKING* ORDER PART NUMBER S6 PART MARKING*
LTC6908CDCB-1
LTC6908IDCB-1
LTC6908CDCB-2
LTC6908IDCB-2
LBXZ
LBXZ
LBYB
LBYB
LTC6908CS6-1
LTC6908IS6-1
LTC6908HS6-1
LTC6908CS6-2
LTC6908IS6-2
LTC6908HS6-2
LTBYC
LTBYC
LTBYC
LTBYD
LTBYD
LTBYD
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
690812fa
2


Part Number LTC6908-1
Description Resistor Set SOT-23 Oscillator
Maker Linear Technology
Total Page 16 Pages
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