LTC6908-1 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC6908-1' PDF : 16 Pages View PDF
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 LTC6908I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 3: LTC6908C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6908C 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 LTC6908I is guaranteed to meet
the specified performance limits from –40°C to 85°C. The LTC6908H is
guaranteed to meet the specified performance limits from –40°C to 125°C.
Note 4: Frequency accuracy is defined as the deviation from the fOUT
equation.
Note 5: Guaranteed by 5V test
Note 6: To conform to the Logic IC Standard, current out of a pin is
arbitrarily given a negative value.
Note 7: Output rise and fall times are measured between the 10% and the
90% power supply levels with no output loading. These specifications are
based on characterization.
Note 8: Long term drift on 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 888ppm at 300ppm/√kHr. Ten
years is 87.7kHr and would yield a drift of 2,809 ppm at 300 ppm/√kHr.
Drift without power applied to the device may be approximated as 1/10th
of the drift with power, or 30ppm/√kHr for a 300ppm/√kHr device.
TYPICAL PERFOR A CE CHARACTERISTICS
Frequency Error vs RSET,
V+ = 3V
5
4 GUARANTEED MAX
3 OVER TEMPERATURE
TA = 25°C
2
1
TYPICAL MAX
0
–1
TYPICAL MIN
–2
–3 GUARANTEED MIN
–4 OVER TEMPERATURE
–5
10k
100k
1M
RSET (Ω)
10M
690812 G01
Peak to Peak Jitter vs Output
Frequency
1.0
0.9
0.8
0.7
5V
0.6
0.5
3V
0.4
0.3
0.2
0.1
0
10k
100k
1M
FREQUENCY (Hz)
10M
690812 G04
4
Frequency Error vs RSET,
V+ = 5V
5
TA = 25°C
4
3
2
1 TYPICAL MAX
GUARANTEED MAX
OVER TEMPERATURE
0
–1
–2 TYPICAL MIN
–3
GUARANTEED MIN
OVER TEMPERATURE
–4
–5
10k
100k
1M
RSET (Ω)
10M
690812 G02
Supply Current vs Output
Frequency
2.0
1.5
5V SSFM ENABLED
1.0
3V SSFM ENABLED
0.5
0
10k
3V SSFM DISABLED
5V SSFM DISABLED
100k
1M
FREQUENCY (Hz)
10M
690812 G05
Frequency Error vs Temperature
1.00
0.75
0.50
0.25
0
TYPICAL MAX
–0.25
–0.50
–0.75
TYPICAL MIN
–1.00
–40 –20 0
20 40 60 80
TEMPERATURE (°C)
690812 G03
Supply Current vs Temperature
800
CL 5pF ON BOTH OUTPUTS
750 FREQUENCY = 1MHz
SSFM DISABLED
700
650
V+ = 5V
600
550
500
V+ = 3V
450
400
–40 –20 0
20 40 60 80
TEMPERATURE (°C)
690812 G06
690812fa
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