LTC6909 查看數據表（PDF） - Linear Technology
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LTC6909
Linear Technology
LTC6909 Datasheet PDF : 20 Pages
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LTC6909
ELECTRICAL CHARACTERISTICS
Note 4: fMASTER is the internal master oscillator frequency. The output
frequency is fMASTER/PH. The PH value is determined by the connections
of the PH0, PH1 and PH2 pins as described in the Applications Information
section.
Note 5: Frequency accuracy is defined as the deviation from the fOUT
equation. fMASTER = 20MHz • 10k/RSET, fOUT = 20MHz • 10k/(RSET • PH),
PH = 3, 4, 5, 6, 7 or 8.
Note 6: Guaranteed by 5V test.
Note 7: To conform to the Logic IC Standard, current out of a pin is
defined as a negative value.
Note 8: 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 9: 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 nonlinear 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. Drift
without power applied to the device (aging) may be approximated as
1/10th of the drift with power, or 30ppm/√kHr for a 300ppm/√kHr device.
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Error vs RSET, V+ = 2.7V
5
4 GUARANTEED MAX
OVER TEMPERATURE
3
TA = 25°C
2
1
TYPICAL MAX
0
–1
TYPICAL MIN
–2
–3
–4
GUARANTEED MIN
OVER TEMPERATURE
–5
10k
100k
1M
RSET (Ω)
10M
6909 G01
Supply Current vs Supply Voltage
1800
1600
1400
1200
PH = 3, SSFM ENABLED
CLOAD = 5pF
RLOAD = 5k
RSET = 20k
1000
800
600
RSET = 100k
RSET = 400k
400
RSET = 2M
200
0
2.7
3.2
3.7
4.2
SUPPLY VOLTAGE (V)
4.7
6909 G04
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
6909 G02
Supply Current
vs RSET (SSFM Enabled)
3000
2500
V+ = 5V, PH = 3
CLOAD = 5pF
V+ = 5V, PH = 8
2000
1500
V+ = 2.7V, PH = 3
1000
500
V+ = 2.7V, PH = 8
0
10k
100k
1M
RSET (Ω)
10M
6909 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)
6909 G03
Supply Current
vs RSET (SSFM Disabled)
3000
2500
V+ = 5V, PH = 3
CLOAD = 5pF
RLOAD = 5k
2000
V+ = 5V, PH = 8
1500
1000
V+ = 2.7V, PH = 3
500
V+ = 2.7V, PH = 8
0
10k
100k
1M
RSET (Ω)
10M
6909 G06
6909f
4
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