ltc6930-8.00 Linear Technology Corporation, ltc6930-8.00 Datasheet

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ltc6930-8.00

Manufacturer Part Number
ltc6930-8.00
Description
32.768khz To 8.192mhz Precision ?power Oscillators
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
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
490μA Typical Supply Current at 8MHz, V
Typical RMS Period Jitter <0.15% at V
No External Components to Set Frequency
5 Options Cover 32.768kHz to 8.192MHz:
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
LTC6930-4.19: 4.194304MHz ÷ N
LTC6930-5.00: 5.000000MHz ÷ N
LTC6930-7.37: 7.373800MHz ÷ N
LTC6930-8.00: 8.000000MHz ÷ N
LTC6930-8.19: 8.192000MHz ÷ N
4MHz Micropower Clock Generator
DIVA
DIVB
DIVC
GND
LTC6930-8.00
V
+
I
S
V
+
= 325μA AT 3V
= 1.7V TO 5.5V
GND
V
+
OUT
0.1μF
6930 TA01a
DC
4MHz
+
= 3V
+
+
= 3V
= 3V
Precision µPower Oscillators
DESCRIPTION
The LTC
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 fi xed
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 specifi cations. 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 of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6342817, 6614313.
®
6930 series is a family of very low power precision
32.768kHz to 8.192MHz
70
60
50
40
30
20
10
–0.10
0
Typical Frequency Error Distribution
T
V
DIV = 0
1045 UNITS
A
+
= 25°C
= 3V
–0.05
FREQUENCY ERROR (%)
0
LTC6930-X.XX
0.05
6930 TA01b
0.10
6930fb
1

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ltc6930-8.00 Summary of contents

Page 1

... No External Components to Set Frequency n 5 Options Cover 32.768kHz to 8.192MHz: LTC6930-4.19: 4.194304MHz ÷ N LTC6930-5.00: 5.000000MHz ÷ N LTC6930-7.37: 7.373800MHz ÷ N LTC6930-8.00: 8.000000MHz ÷ N LTC6930-8.19: 8.192000MHz ÷ N Where 16, 32, 64, 128 (N Determined by State of DIVA, DIVB, DIVC Pins) n –40°C to 125°C Operating Temperature Range Tiny 2mm × ...

Page 2

... LTC6930IDCB-8.19#TRMPBF LTC6930IDCB-8.19#TRPBF LTC6930HDCB-8.19#TRMPBF LTC6930HDCB-8.19#TRPBF LCKY TRM = 500 pieces. 2 Specifi ed Temperature Range (Note 3) LTC6930C ................................................ 0°C to 70°C LTC6930I.............................................. –40°C to 85° 0.3V LTC6930H .......................................... –40°C to 125°C Storage Temperature Range ................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C ...

Page 3

... LTC6930HMS8-4.19#TRPBF LTCKZ LTC6930CMS8-5.00#PBF LTC6930CMS8-5.00#TRPBF LTCLB LTC6930IMS8-5.00#PBF LTC6930IMS8-5.00#TRPBF LTCLB LTC6930HMS8-5.00#PBF LTC6930HMS8-5.00#TRPBF LTCLB LTC6930CMS8-7.37#PBF LTC6930CMS8-7.37#TRPBF LTCLC LTC6930IMS8-7.37#PBF LTC6930IMS8-7.37#TRPBF LTCLC LTC6930HMS8-7.37#PBF LTC6930HMS8-7.37#TRPBF LTCLC LTC6930CMS8-8.00#PBF LTC6930CMS8-8.00#TRPBF LTCLD LTC6930IMS8-8.00#PBF LTC6930IMS8-8.00#TRPBF LTCLD LTC6930HMS8-8 ...

Page 4

... DIV settings with C CONDITIONS + DIVA = DIVB = DIVC = LTC6930-4.19 (4.194304MHz) LTC6930-5.00 (5.000000MHz) LTC6930-7.37 (7.372800MHz) LTC6930-8.00 (8.000000MHz) LTC6930-8.19 (8.192000MHz) The l denotes the specifi cations which apply over the full operating = 25°C. Unless otherwise noted, specifi cations apply over the full range ...

Page 5

... LTC6930 family of parts are defi ned as follows: LTC6930-4.19 LTC6930-5.00 LTC6930-7.37 LTC6930-8.00 LTC6930-8.19 Note 5: Long-term drift of silicon oscillators is primarily due to the movement of ions and impurities within the silicon and is tested at 30°C under otherwise nominal operating conditions. Long-term drift is specifi ppm/√ ...

Page 6

... Typical Supply Current vs Supply Voltage 1000 DIVIDE = 1 900 T = 25°C A 800 8.192MHz 700 600 500 4.194MHz 400 300 200 100 0 60 1.7 2.2 2.7 3.2 3.7 4.2 4.7 SUPPLY VOLTAGE (V) Typical Output Waveform, 8MHz 0.45V/DIV 40ns/DIV LTC6930-8. 12pF LOAD 115 125 4216 G03 5.2 4216 G06 6930 G09 6930fb ...

Page 7

... T = 30°C 400 A 300 200 100 0 –100 –200 –300 –400 –500 200 0 500 1000 1500 2000 2500 TIME (HOURS) LTC6930-X.XX Typical Jitter vs Divider Setting 0. 25°C 0.14 0.12 0.10 0.08 0.06 8.192MHz 0.04 0.02 0 300 450 1 10 DIV SETTING (LOG) 4216 G11 Typical Output Duty Cycle vs Supply and Divide Ratio ...

Page 8

... Especially at high frequencies, the capacitive loading of the output of the LTC6930 may cause the majority of the power supply dissipation of the part. The LTC6930 supply current is specifi output load of 5pF , which is equivalent to two standard HC logic inputs ...

Page 9

... 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: ...

Page 10

... LTC6930-4.19 4.194304MHz 2.097152MHz 1.048576MHz LTC6930-5.00 5.000MHz 2.500MHz LTC6930-7.37 7.3728MHz 3.6864MHz LTC6930-8.00 8.000MHz 4.000MHz LTC6930-8.19 8.192MHz 4.096MHz 10 Setting the Frequency The output frequency of the LTC6930 is chosen from the values in Table 1 and set using the DIV pins, as noted in the table. Master oscillator frequency is preset in the factory, and the DIV pins select an internal binary divider 128 ...

Page 11

... LTC DWG # 05-08-1660 Rev F) DETAIL “A” 0.254 (.010) 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE LTC6930-X. 0.115 0.40 ± 0.10 TYP TYP 1.35 ±0.10 1.65 ± 0.10 PIN 1 NOTCH R = 0.20 OR 0.25 × 45° CHAMFER ...

Page 12

... GND 2k 1μF LTC1569-7 4 – V DIV/CLK 0.1μF 2 GND 3 DIVA DIVA LTC6930-8.192 4 DIVB DIVB DIVC DIVC, DIVB, DIVA f 256kHz CUTOFF RELATED PARTS PART NUMBER DESCRIPTION LTC1799 1kHz to 33MHz ThinSOT Oscillator, Resistor Set LTC6900 1kHz to 20MHz ThinSOT Oscillator, Resistor Set LTC6902 ...

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