Datasheet
LTC6909
4
6909fa
Frequency Error vs R
SET
, V
+
= 2.7V Frequency Error vs R
SET
, V
+
= 5V
Frequency Error vs Temperature
Supply Current vs Supply Voltage
Supply Current
vs R
SET
(SSFM Enabled)
Supply Current
vs R
SET
(SSFM Disabled)
Note 4: f
MASTER
is the internal master oscillator frequency. The output
frequency is f
MASTER
/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 f
OUT
equation. f
MASTER
= 20MHz • 10k/R
SET
, f
OUT
= 20MHz • 10k/(R
SET
• 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
SUPPLY CURRENT (µA)
200
600
800
1000
3.7
4.7
1800
6909 G04
400
3.2 4.2
1200
1400
1600
R
SET
= 2M
R
SET
= 20k
R
SET
= 100k
R
SET
= 400k
PH = 3, SSFM ENABLED
C
LOAD
= 5pF
R
LOAD
= 5k
R
SET
(Ω)
10k
0
I
SUPPLY
(µA)
1000
2000
3000
500
1500
2500
100k 1M 10M
6909 G05
C
LOAD
= 5pF
V
+
= 5V, PH = 3
V
+
= 5V, PH = 8
V
+
= 2.7V, PH = 3
V
+
= 2.7V, PH = 8
R
SET
(Ω)
10k
0
I
SUPPLY
(µA)
1000
2000
3000
500
1500
2500
100k 1M 10M
6909 G06
C
LOAD
= 5pF
R
LOAD
= 5k
V
+
= 5V, PH = 3
V
+
= 5V, PH = 8
V
+
= 2.7V, PH = 3
V
+
= 2.7V, PH = 8
R
SET
(Ω)
10k
FREQUENCY ERROR (%)
5
4
3
2
1
0
–1
–2
–3
–4
–5
100k 1M 10M
6909 G01
T
A
= 25°C
TYPICAL MAX
GUARANTEED MIN
OVER TEMPERATURE
TYPICAL MIN
GUARANTEED MAX
OVER TEMPERATURE
R
SET
(Ω)
10k
FREQUENCY ERROR (%)
5
4
3
2
1
0
–1
–2
–3
–4
–5
100k 1M 10M
6909 G02
T
A
= 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