LTC6909
4
6909fa
Frequency Error vs RSET, V+ = 2.7V
Frequency Error vs RSET, V+ = 5V
Frequency Error vs Temperature
Supply Current vs Supply Voltage
Supply Current
vs RSET (SSFM Enabled)
Supply Current
vs RSET (SSFM Disabled)
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.
electricAl chArActeristics
typicAl perForMAnce chArActeristics
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.
SUPPLY VOLTAGE (V)
2.7
0
SUPPL
YCURRENT
(A)
200
600
800
1000
3.7
4.7
1800
6909 G04
400
3.2
4.2
1200
1400
1600
RSET = 2M
RSET = 20k
RSET = 100k
RSET = 400k
PH = 3, SSFM ENABLED
CLOAD = 5pF
RLOAD = 5k
RSET ()
10k
0
I SUPPL
Y(A)
1000
2000
3000
500
1500
2500
100k
1M
10M
6909 G05
CLOAD = 5pF
V+ = 5V, PH = 3
V+ = 5V, PH = 8
V+ = 2.7V, PH = 3
V+ = 2.7V, PH = 8
RSET ()
10k
0
I SUPPL
Y(A)
1000
2000
3000
500
1500
2500
100k
1M
10M
6909 G06
CLOAD = 5pF
RLOAD = 5k
V+ = 5V, PH = 3
V+ = 5V, PH = 8
V+ = 2.7V, PH = 3
V+ = 2.7V, PH = 8
RSET ()
10k
FREQUENCY
ERROR
(%)
5
4
3
2
1
0
–1
–2
–3
–4
–5
100k
1M
10M
6909 G01
TA = 25°C
TYPICAL MAX
GUARANTEED MIN
OVER TEMPERATURE
TYPICAL MIN
GUARANTEED MAX
OVER TEMPERATURE
RSET ()
10k
FREQUENCY
ERROR
(%)
5
4
3
2
1
0
–1
–2
–3
–4
–5
100k
1M
10M
6909 G02
TA = 25°C
TYPICAL MAX
GUARANTEED MAX
OVER TEMPERATURE
GUARANTEED MIN
OVER TEMPERATURE
TYPICAL MIN
TEMPERATURE (°C)
–40
FREQUENCY
ERROR
(%)
20
60
6909 G03
–20
0
40
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
80
TYPICAL MAX
TYPICAL MIN