LTC6930-X.XX
32.768kHz to 8.192MHz
Precision µPower Oscillators
FEATURES
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DESCRIPTION
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 ultra-low power operation while maintain-
ing 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 and LTM 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.
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Frequency Error <0.09% Max at 25°C
Startup 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: 7.373800MHz ÷ 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
APPLICATIONS
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Digitally Controlled Oscillator
Microprocessor Clock
Power Supply Clock
Portable and Battery Operated Devices
TYPICAL APPLICATION
4MHz Micropower Clock Generator
V
+
= 1.7V TO 5.5V
I
S
= 325μA AT 3V
DC
Typical Frequency Error Distribution
70
T
A
= 25°C
V
+
= 3V
60 DIV = 0
1045 UNITS
50
UNITS
40
30
20
10
0
–0.10
0.1μF
V
+
V
+
DIVA
OUT
LTC6930-8.00
DIVB
DIVC
GND
GND
4MHz
6930 TA01a
–0.05
0
0.05
FREQUENCY ERROR (%)
0.10
6930 TA01b
6930fa
1
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 .......................................... –40°C to 125°C
Specified Temperature Range (Note 3)
LTC6930C ................................................ 0°C to 70°C
LTC6930I.............................................. –40°C to 85°C
LTC6930H .......................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
V
+
1
GND 2
DIVA 3
DIVB 4
9
8 V
+
7 OUT
6 GND
5 DIVC
TOP VIEW
V
+
1
GND 2
DIVA 3
DIVB 4
8
7
6
5
V
+
OUT
GND
DIVC
DCB PACKAGE
8-LEAD (2mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 64°C/W
EXPOSED PAD (PIN 9) IS V
–
, MUST BE SOLDERED TO PCB
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 300°C/W
(SINGLE-LAYER BOARD)
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI)
LTC6930CDCB-4.19#TRMPBF
LTC6930IDCB-4.19#TRMPBF
LTC6930CDCB-5.00#TRMPBF
LTC6930IDCB-5.00#TRMPBF
LTC6930CDCB-7.37#TRMPBF
LTC6930IDCB-7.37#TRMPBF
LTC6930CDCB-8.00#TRMPBF
LTC6930IDCB-8.00#TRMPBF
LTC6930CDCB-8.19#TRMPBF
LTC6930IDCB-8.19#TRMPBF
TRM = 500 pieces.
6930fa
TAPE AND REEL
LTC6930IDCB-4.19#TRPBF
PART MARKING* PACKAGE DESCRIPTION
LCKT
TEMPERATURE RANGE
LTC6930CDCB-4.19#TRPBF LCKT
8-Lead (2mm
×
3mm) Plastic DFN 0°C to 70°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 85°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 125°C
8-Lead (2mm
×
3mm) Plastic DFN 0°C to 70°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 85°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 125°C
8-Lead (2mm
×
3mm) Plastic DFN 0°C to 70°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 85°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 125°C
8-Lead (2mm
×
3mm) Plastic DFN 0°C to 70°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 85°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 125°C
8-Lead (2mm
×
3mm) Plastic DFN 0°C to 70°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 85°C
8-Lead (2mm
×
3mm) Plastic DFN –40°C to 125°C
LTC6930HDCB-4.19#TRMPBF LTC6930HDCB-4.19#TRPBF LCKT
LTC6930CDCB-5.00#TRPBF LCKV
LTC6930IDCB-5.00#TRPBF
LCKV
LTC6930HDCB-5.00#TRMPBF LTC6930HDCB-5.00#TRPBF LCKV
LTC6930CDCB-7.37#TRPBF LCKW
LTC6930IDCB-7.37#TRPBF
LCKW
LTC6930HDCB-7.37#TRMPBF LTC6930HDCB-7.37#TRPBF LCKW
LTC6930CDCB-8.00#TRPBF LCKX
LTC6930IDCB-8.00#TRPBF
LCKX
LTC6930HDCB-8.00#TRMPBF LTC6930HDCB-8.00#TRPBF LCKX
LTC6930CDCB-8.19#TRPBF LCKY
LTC6930IDCB-8.19#TRPBF
LCKY
LTC6930HDCB-8.19#TRMPBF LTC6930HDCB-8.19#TRPBF LCKY
2
LTC6930-X.XX
ORDER INFORMATION
LEAD FREE FINISH
LTC6930IMS8-4.19#PBF
LTC6930HMS8-4.19#PBF
LTC6930CMS8-5.00#PBF
LTC6930IMS8-5.00#PBF
LTC6930HMS8-5.00#PBF
LTC6930CMS8-7.37#PBF
LTC6930IMS8-7.37#PBF
LTC6930HMS8-7.37#PBF
LTC6930CMS8-8.00#PBF
LTC6930IMS8-8.00#PBF
LTC6930HMS8-8.00#PBF
LTC6930CMS8-8.19#PBF
LTC6930IMS8-8.19#PBF
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
LTC6930IMS8-4.19#TRPBF LTCKZ
LTC6930HMS8-4.19#TRPBF LTCKZ
LTC6930CMS8-5.00#TRPBF LTCLB
LTC6930IMS8-5.00#TRPBF LTCLB
LTC6930HMS8-5.00#TRPBF LTCLB
LTC6930CMS8-7.37#TRPBF LTCLC
LTC6930IMS8-7.37#TRPBF LTCLC
LTC6930HMS8-7.37#TRPBF LTCLC
LTC6930CMS8-8.00#TRPBF LTCLD
LTC6930IMS8-8.00#TRPBF LTCLD
LTC6930HMS8-8.00#TRPBF LTCLD
LTC6930CMS8-8.19#TRPBF LTCLF
LTC6930IMS8-8.19#TRPBF LTCLF
LTC6930HMS8-8.19#PBF
LTC6930HMS8-8.19#TRPBF LTCLF
8-Lead Plastic MSOP
*Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
AC ELECTRICAL CHARACTERISTICS
SYMBOL
Δfi
Δf
PARAMETER
Initial Frequency Accuracy
Frequency Accuracy
(Note 4)
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 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 C
LOAD
= 5pF R
LOAD
= ∞.
,
MIN
TYP
0.08
l
l
l
l
l
l
l
l
l
l
l
l
l
MAX
0.09
±0.45
±0.65
±1
±0.52
±0.65
±1.1
±0.8
±0.95
±1.3
UNITS
%
%
%
%
%
%
%
%
%
%
%/°C
%/°C
%/V
ppm/√kHr
DIVA = DIVB = DIVC = 0, T
A
= 25°C, V
+
= 3V
V
+
= 3V – 3.6V
LTC6930C
LTC6930I
LTC6930H
V
+
= 2V – 3.6V
LTC6930C
LTC6930I
LTC6930H
V
+
= 1.7V – 5.5V
LTC6930C
LTC6930I
LTC6930H
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
0.0001
0.001
0.07
30
Δf/ΔT
Δf/ΔV
Frequency Drift Over Temperature
Frequency Drift Over Supply
Long-Term Frequency Stability
MS8 Package
DCB Package
(Note 5)
6930fa
3
LTC6930-X.XX
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
RMS Period Jitter
CONDITIONS
DIVA = DIVB = DIVC = 0, V
+
= 3V
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 specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 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 C
LOAD
= 5pF R
LOAD
= ∞.
,
MIN
TYP
320
1.7
225
1.2
180
0.97
130
0.8
130
0.8
MAX
UNITS
ps RMS
ns
P-P
ps RMS
ns
P-P
ps RMS
ns
P-P
ps RMS
ns
P-P
ps RMS
ns
P-P
DC ELECTRICAL CHARACTERISTICS
SYMBOL
V
S
I
S,DC
PARAMETER
Supply Voltage Applied Between
V
+
and GND
V
+
Combined Supply Current
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 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 C
LOAD
= 5pF R
LOAD
= ∞.
,
l
MIN
1.7
TYP
MAX
5.5
UNITS
V
LTC6930-4.19
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
LTC6930-5.00
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
170
260
490
80
105
130
201
307
579
95
124
154
296
453
853
139
183
226
321
491
926
151
198
246
310
500
880
150
190
210
1.25
290
420
750
160
190
355
430
570
960
176
212
375
480
660
1310
220
273
440
520
740
1380
240
295
475
490
760
1400
270
325
540
1.4
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
V
6930fa
I
S,DC
V
+
Combined Supply Current
LTC6930-7.37
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
LTC6930-8.00
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
LTC6930-8.19
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
V
IH
Minimum High Level Input Voltage,
All Digital Input Pins
4
LTC6930-X.XX
DC ELECTRICAL CHARACTERISTICS
SYMBOL
V
IL
I
IN
R
OUT
V
OH
PARAMETER
Maximum Low Level Input Voltage,
All Digital Input Pins
Digital Input Leakage Current, All
Digital Input Pins
Output Resistance
High Level Output Voltage
CONDITIONS
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 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 C
LOAD
= 5pF R
LOAD
= ∞.
,
MIN
0.7
TYP
1.25
MAX
UNITS
V
μA
Ω
V
V
V
V
V
V
V
V
0.1
0.1
0.1
V
V
V
V
V
V
V
V
0 < V
IN
< V
+
OUT Pin, V
+
= 3V
DIVA = DIVB = DIVC = 0, No Load
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
DIVA = DIVB = DIVC = 0, 1kΩ Load to GND
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
DIVA = DIVB = DIVC = 0, No Load
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
DIVA = DIVB = DIVC = 0, 1kΩ Load to V
+
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
l
±1
40
l
l
l
5.4
2.9
1.8
5.5
3
2
1.7
5.2
2.7
1.6
1.5
0
0
0
0
0.3
0.3
0.3
0.3
l
l
l
5
2.6
1.5
V
OL
Low Level Output Voltage
l
l
l
l
l
l
0.7
0.5
0.35
TIMING CHARACTERISTICS
SYMBOL
t
rf
DCY
PARAMETER
Duty Cycle
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 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 f
OUT
= 32.768kHz to 8.192MHz with C
LOAD
= 5pF R
LOAD
= ∞.
,
CONDITIONS
DIVA = DIVB = DIVC = 0; V
+
= 2V to 5.5V
DIVA = DIVB = DIVC = 0
DIVA or DIVB or DIVC ≠ 0
Edge of DIV Signal to 1st Accurate Output Cycle
V
+
> 1.7V to 1st Accurate Output Cycle
l
l
l
l
MIN
35
35
48
TYP
3
50
50
50
1
MAX
65
70
52
110
UNITS
ns
%
%
%
Cycle
μs
Output Rise/Fall Time (10% to 90%) V
+
= 3V
D
DIV
D
PON
DIV to F
OUT
Delay
Power On Delay
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:
LTC6930C is guaranteed functional over the operating range of
–40°C to 85°C.
Note 3:
The LTC6930C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6930C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LTC6930I is guaranteed to meet
specified performance from –40°C to 85°C. The LTC6930H is guaranteed
to meet specified performance from –40°C to 125°C.
Note 4:
Frequency accuracy and frequency drift are defined as deviation
from the nominal frequency or the nominal frequency divided by the
integer set through the DIV pins for each part. The nominal frequency for
the LTC6930 family of parts are defined as follows:
LTC6930-4.19
f
NOM
= 4.194304MHz
LTC6930-5.00
f
NOM
= 5.000000MHz
LTC6930-7.37
f
NOM
= 7.372800MHz
LTC6930-8.00
f
NOM
= 8.000000MHz
LTC6930-8.19
f
NOM
= 8.192000MHz
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 specified
as ppm/√kHr due to the typically non-linear nature of the drift. To calculate
drift for a set time period, translate that time into thousands of hours,
take the square root and multiply by the typical drift number. For instance,
a year is 8.77kHr and would yield a drift of 89ppm at 30ppm/√kHr. Drift
without power applied to the device may be approximated as 1/10th of the
drift with power, or 3ppm/√kHr for a 30ppm/√kHr device.
6930fa
5
51单片机
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