LTC6909 Linear Dimensions Semiconductor, LTC6909 Datasheet - Page 4

• Manufacturer Part Number: LTC6909
• Description: Multiphase Silicon Oscillator
• Manufacturer: Linear Dimensions Semiconductor

www.DataSheet4U.com
LTC6909
ELECTRICAL CHARACTERISTICS
Note 4: f
frequency is f
of the PH0, PH1 and PH2 pins as described in the Applications Information
section.
Note 5: Frequency accuracy is defi ned as the deviation from the f
equation. f
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
defi ned 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 specifi cations are
based on characterization.
TYPICAL PERFORMANCE CHARACTERISTICS
4
1800
1600
1400
1200
1000
800
400
600
200
–1
–2
–3
–4
–5
0
5
4
3
2
1
0
2.7
10k
Frequency Error vs R
Supply Current vs Supply Voltage
MASTER
GUARANTEED MAX
OVER TEMPERATURE
PH = 3, SSFM ENABLED
C
R
GUARANTEED MIN
OVER TEMPERATURE
R
LOAD
MASTER
LOAD
SET
MASTER
= 20k
= 5pF
= 5k
3.2
is the internal master oscillator frequency. The output
R
SET
= 20MHz • 10k/R
SUPPLY VOLTAGE (V)
100k
/PH. The PH value is determined by the connections
= 100k
TYPICAL MAX
TYPICAL MIN
R
3.7
SET
(Ω)
R
R
SET
1M
SET
4.2
SET
SET
, V
= 400k
= 2M
, f
T
+
OUT
A
= 25°C
= 2.7V
4.7
6909 G04
6909 G01
= 20MHz • 10k/(R
10M
3000
2500
2000
1500
1000
500
–1
–2
–3
–4
–5
5
4
3
2
1
0
0
10k
10k
Frequency Error vs R
Supply Current
vs R
SET
TYPICAL MAX
TYPICAL MIN
V
OUT
• PH),
+
SET
V
+
= 2.7V, PH = 8
V
= 5V, PH = 3
+
(SSFM Enabled)
V
= 5V, PH = 8
+
100k
100k
= 2.7V, PH = 3
R
R
SET
SET
GUARANTEED MAX
OVER TEMPERATURE
GUARANTEED MIN
OVER TEMPERATURE
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 specifi ed
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.
(Ω)
(Ω)
SET
1M
1M
, V
C
LOAD
T
+
A
= 25°C
= 5V
= 5pF
6909 G02
6909 G05
10M
10M
–0.25
–0.50
–0.75
–1.00
3000
2500
2000
1500
1000
1.00
0.75
0.50
0.25
500
0
0
–40
10k
Frequency Error vs Temperature
Supply Current
vs R
V
–20
+
SET
V
= 2.7V, PH = 8
+
V
= 5V, PH = 3
+
V
(SSFM Disabled)
+
= 5V, PH = 8
TEMPERATURE (°C)
= 2.7V, PH = 3
100k
0
R
SET
20
(Ω)
40
1M
TYPICAL MAX
TYPICAL MIN
C
R
LOAD
LOAD
60
= 5pF
= 5k
6909 G03
6909 G06
80
6909f
10M