Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLTC6930IMS8-4.19#PBF

LTC6930-X.XX

6930fd

–0.10 0.10

6930 TA01b

–0.05 0.050

FREQUENCY ERROR (%)

UNITS

= 25°C

= 3V

DIV = 0

1045 UNITS

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

32.768kHz to 8.192MHz

Precision µPower Oscillators

The LTC

6930 series is a family of very low power precision

silicon oscillators with a frequency error less than 0.09%.

For each oscillator, the user can select one of 8 frequen-

cies between 32.768kHz and 8.192MHz. Based on a fixed

master oscillator frequency, internal frequency dividers

between 1 and 128 provide the 8 different frequencies.

The LTC6930 requires no external components other than

power supply bypass capacitors. Requiring only a single

1.7V to 5.5V supply enables operation from a single Li-Ion

cell or 2 AA alkaline cells.

The LTC6930 features a proprietary control architecture

that allows for ultralow power operation while maintaining

industry leading accuracy and jitter specifications. The

exceptionally fast start-up time, combined with the low

power consumption, is ideal for battery operated applica-

tions with frequent power-up cycles.

Any frequency from 32.768kHz to 8.192MHz can be pro-

vided by the factory. Minimum order sizes apply for custom

frequencies. Please consult LTC Marketing for details.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners. Protected by U.S. Patents, including 6342817, 6614313.

4MHz Micropower Clock Generator

Frequency Error <0.09% Max at 25°C

Start-Up Time <110µs at All Frequencies

1.7V to 5.5V Single Supply Operation

105µA Typical Supply Current at 32kHz, V

= 3V

490µA Typical Supply Current at 8MHz, V

= 3V

Typical RMS Period Jitter <0.15% at V

= 3V

No External Components to Set Frequency

5 Options Cover 32.768kHz to 8.192MHz:

LTC6930-4.19: 4.194304MHz ÷ N

LTC6930-5.00: 5.000000MHz ÷ N

LTC6930-7.37: 7.372800MHz ÷ N

LTC6930-8.00: 8.000000MHz ÷ N

LTC6930-8.19: 8.192000MHz ÷ N

Where N = 1, 2, 4, 8, 16, 32, 64, 128

(N Determined by State of DIVA, DIVB, DIVC Pins)

–40°C to 125°C Operating Temperature Range

Tiny 2mm × 3mm DFN or MS8 Package

Digitally Controlled Oscillator

Microprocessor Clock

Power Supply Clock

Portable and Battery Operated Devices

Typical Frequency Error Distribution

4MHz

0.1µF

6930 TA01a

= 1.7V TO 5.5V

= 325µA AT 3V

GNDGND

OUT

DIVB

DIVA

DIVC

LTC6930-8.00

Summary of content (14 pages)

PAGE 1
LTC6930-X.XX 32.768kHz to 8.192MHz Precision µPower Oscillators FEATURES n n n n n n n n n n DESCRIPTION Frequency Error <0.09% Max at 25°C Start-Up Time <110µs at All Frequencies 1.7V to 5.5V Single Supply Operation 105µA Typical Supply Current at 32kHz, V+ = 3V 490µA Typical Supply Current at 8MHz, V+ = 3V Typical RMS Period Jitter <0.15% at V+ = 3V No External Components to Set Frequency 5 Options Cover 32.768kHz to 8.192MHz: LTC6930-4.19: 4.194304MHz ÷ N LTC6930-5.00: 5.000000MHz ÷ N LTC6930-7.37: 7.
PAGE 2
LTC6930-X.XX ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V+ to GND).............................................. –0.3V to 6V Any Input Pin to GND (DIV Pins).......................................–0.3V to V+ + 0.3V Operating Temperature Range (Note 2) LTC6930C............................................. –40°C to 85°C LTC6930I.............................................. –40°C to 85°C LTC6930H...........................................
PAGE 3
LTC6930-X.XX ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC6930CMS8-4.19#PBF LTC6930CMS8-4.19#TRPBF LTCKZ 8-Lead Plastic MSOP 0°C to 70°C LTC6930IMS8-4.19#PBF LTC6930IMS8-4.19#TRPBF LTCKZ 8-Lead Plastic MSOP –40°C to 85°C LTC6930HMS8-4.19#PBF LTC6930HMS8-4.19#TRPBF LTCKZ 8-Lead Plastic MSOP –40°C to 125°C LTC6930CMS8-5.00#PBF LTC6930CMS8-5.00#TRPBF LTCLB 8-Lead Plastic MSOP 0°C to 70°C LTC6930IMS8-5.00#PBF LTC6930IMS8-5.
PAGE 4
LTC6930-X.XX AC ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Unless otherwise noted, specifications apply over the full range of operating supply voltage and frequency output: V+ = 1.7V to 5.5V and all DIV settings with CLOAD = 5pF, RLOAD = ∞. SYMBOL PARAMETER CONDITIONS RMS Period Jitter DIVA = DIVB = DIVC = 0, V+ = 3V LTC6930-4.19 (4.194304MHz) MIN TYP MAX 320 1.7 225 1.2 180 0.
PAGE 5
LTC6930-X.XX DC ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Unless otherwise noted, specifications apply over the full range of operating supply voltage and frequency output: V+ = 1.7V to 5.5V and all DIV settings with CLOAD = 5pF, RLOAD = ∞.
PAGE 6
LTC6930-X.XX TYPICAL PERFORMANCE CHARACTERISTICS Frequency Error vs Temperature, MS8 Package 0.25 0.60 TA = 25°C 0.20 Frequency Error vs Temperature, DFN Package 0.60 V+ = 3V 8.19MHz 0.10 0.05 4.19MHz 0 –0.05 –0.10 –0.15 V+ = 3V 0.40 FREQUENCY ERROR (%) 0.40 0.15 FREQUENCY ERROR (%) 0.20 0 –0.20 –0.40 0.20 0 –0.20 –0.40 –0.20 –0.25 1.7 –0.60 –45 –25 –5 2.7 3.7 4.7 SUPPLY VOLTAGE (V) 15 35 55 75 TEMPERATURE (°C) 95 115 125 4216 G01 2000 TA = 25°C 8.192MHz, 1.7V 8.
PAGE 7
LTC6930-X.XX TYPICAL PERFORMANCE CHARACTERISTICS Typical Jitter vs Supply in Divide by 1 Mode 0.30 Typical Period Jitter Histogram 400 TA = 25°C LTC6930-8.19 0.25 0.12 8.192MHz JITTER (% RMS) 0.15 200 0.10 100 2.2 2.7 3.2 3.7 4.2 4.7 SUPPLY VOLTAGE (V) 0 –450 5.2 –300 –150 0 150 PERIOD ERROR (ps) 300 4.194MHz 0.06 8.192MHz Typical Output Rise/Fall Time vs Supply Typical Output Resistance vs Supply Voltage 100 CLOAD = 5pF TA = 25°C 4.0 OUTPUT RESISTANCE (Ω) 3.5 RISE TIME 3.0 2.5 2.
PAGE 8
LTC6930-X.XX PIN FUNCTIONS V+ (Pins 1, 8): Positive Supply Pins. Each supply pin should be bypassed directly to the neighboring GND pin with a 0.1µF ceramic capacitor, and must be externally connected to the other V+ pin (see recommended layout). GND (Pins 2, 6): Ground Pins. Each should be connected to a low inductance ground plane and must be connected to the other GND pin and on the DFN package, Pin 9. DIVA, DIVB, DIVC (Pins 3, 4, 5): Output Prescaler.
PAGE 9
LTC6930-X.XX APPLICATIONS INFORMATION state. The 2ns rise and fall times of the LTC6930 mean that the instantaneous power supply current required during the rise and fall portions of the waveform is much greater than the average. The instantaneous power supply current may be calculated by a similar formula: 1 IPEAK = CLOAD • VSWING • tr f where trf is the rise/fall time of the signal. In this case, 14mA spikes are generated by driving 5.5V into a 5pF load.
PAGE 10
LTC6930-X.XX APPLICATIONS INFORMATION 5 years is not 5 times the drift for one year. A sample calculation for drift over 5 years at 30ppm/√kHr is as follows: 5 years • 365.25 days/year • 24 hours/day = 43,830 hours = 43.830kHr √43.830kHr = 6.62√kHr 6.62√kHr • 30ppm/√kHr = 0.0198% over 5 years. Drift calculations assume that the part is in continuous operation during the entire time period of the calculation.
PAGE 11
LTC6930-X.XX PACKAGE DESCRIPTION DCB Package 8-Lead Plastic DFN (2mm × 3mm) (Reference LTC DWG # 05-08-1718 Rev A) 0.70 ±0.05 1.35 ±0.05 3.50 ±0.05 1.65 ± 0.05 2.10 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.45 BSC 1.35 REF RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 2.00 ±0.10 (2 SIDES) R = 0.05 TYP R = 0.115 TYP 5 0.40 ± 0.10 8 1.35 ±0.10 1.65 ± 0.10 3.00 ±0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.
PAGE 12
LTC6930-X.XX PACKAGE DESCRIPTION MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev F) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 0.254 (.010) 7 6 5 0.52 (.0205) REF 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 3.20 – 3.45 (.126 – .136) 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.42 ± 0.038 (.0165 ± .0015) TYP 8 0.65 (.0256) BSC 1 1.10 (.043) MAX 2 3 4 0.86 (.034) REF 0.18 (.
PAGE 13
LTC6930-X.XX REVISION HISTORY (Revision history begins at Rev C) REV DATE DESCRIPTION PAGE NUMBER C 1/11 Revised the option for LTC6930-7.37 under Features. 1 D 2/11 Added LTC6930CMS8-4.19 to the Order Information section. 3 6930fd Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 14
LTC6930-X.XX TYPICAL APPLICATION Dual, Matched, Digitally Programmable, Lowpass Filter, 2kHz to 256kHz VIN1 3.48k IN+ OUT 2 IN– V+ 3 2k 5V 1 1µF VIN2 3.48k 2k 4 DIVA DIVB V – DIV/CLK IN+ OUT 2 IN– V+ 4 1 0.1µF RX LTC1569-7 1 3 1µF GND 2 3 4 GND RX LTC1569-7 V– DIV/CLK V+ V+ GND OUT DIVA GND LTC6930-8.192 DIVB DIVC 8 7 VOUT1 5V 0.1µF 6 Amplitude Response 5 8 7 0 5V 0.1µF 6 5 8 fCUTOFF 32kHz 128kHz –60 –100 fOSC 7 –40 fCUTOFF = 8kHz –80 5V 0.