Datasheet LTC6909 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| Pages / Page | 22 / 4 — electricAl chArActeristics Note 4:. Note 9:. Note 5:. Note 6:. Note 7:. … |
| File Format / Size | PDF / 315 Kb |
| Document Language | English |
electricAl chArActeristics Note 4:. Note 9:. Note 5:. Note 6:. Note 7:. Note 8:. typicAl perForMAnce chArActeristics
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LTC6909
electricAl chArActeristics Note 4:
fMASTER is the internal master oscillator frequency. The output
Note 9:
Long term drift on silicon oscillators is primarily due to the frequency is fMASTER/PH. The PH value is determined by the connections movement of ions and impurities within the silicon and is tested at 30°C of the PH0, PH1 and PH2 pins as described in the Applications Information under otherwise nominal operating conditions. Long term drift is specified section. as ppm/√kHr due to the typically nonlinear nature of the drift. To calculate
Note 5:
Frequency accuracy is defined as the deviation from the f drift for a set time period, translate that time into thousands of hours, take OUT equation. f the square root and multiply by the typical drift number. For instance, a MASTER = 20MHz • 10k/RSET, fOUT = 20MHz • 10k/(RSET • PH), PH = 3, 4, 5, 6, 7 or 8. year is 8.77kHr and would yield a drift of 888ppm at 300ppm/√kHr. Drift
Note 6:
Guaranteed by 5V test. 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.
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.
typicAl perForMAnce chArActeristics Frequency Error vs RSET, V+ = 2.7V Frequency Error vs RSET, V+ = 5V Frequency Error vs Temperature
5 5 1.00 TA = 25°C TA = 25°C 4 GUARANTEED MAX 4 OVER TEMPERATURE 0.75 3 3 GUARANTEED MAX 0.50 2 2 OVER TEMPERATURE 1 TYPICAL MAX 1 TYPICAL MAX 0.25 0 0 0 TYPICAL MAX –1 TYPICAL MIN –1 –0.25 –2 –2 GUARANTEED MIN FREQUENCY ERROR (%) FREQUENCY ERROR (%) TYPICAL MIN OVER TEMPERATURE FREQUENCY ERROR (%) –0.50 –3 –3 TYPICAL MIN –4 GUARANTEED MIN –0.75 OVER TEMPERATURE –4 –5 –5 –1.00 10k 100k 1M 10M 10k 100k 1M 10M –40 –20 0 20 40 60 80 RSET (Ω) RSET (Ω) TEMPERATURE (°C) 6909 G01 6909 G02 6909 G03
Supply Current Supply Current Supply Current vs Supply Voltage vs RSET (SSFM Enabled) vs RSET (SSFM Disabled)
1800 3000 3000 PH = 3, SSFM ENABLED CLOAD = 5pF CLOAD = 5pF 1600 CLOAD = 5pF V+ = 5V, PH = 3 RLOAD = 5k V+ = 5V, PH = 3 RLOAD = 5k 2500 2500 1400 RSET = 20k V+ = 5V, PH = 8 1200 2000 2000 V+ = 5V, PH = 8 1000 (µA) (µA) R Y SET = 400k 1500 V+ = 2.7V, PH = 3 Y 1500 800 V+ = 2.7V, PH = 3 Y CURRENT (µA) RSET = 100k I SUPPL I SUPPL 600 1000 1000 SUPPL 400 RSET = 2M 500 500 200 V+ = 2.7V, PH = 8 V+ = 2.7V, PH = 8 0 0 0 2.7 3.2 3.7 4.2 4.7 10k 100k 1M 10M 10k 100k 1M 10M SUPPLY VOLTAGE (V) RSET (Ω) RSET (Ω) 6909 G05 6909 G04 6909 G06 6909fa 4 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
electricAl chArActeristics Note 4:
fMASTER is the internal master oscillator frequency. The output
Note 9:
Long term drift on silicon oscillators is primarily due to the frequency is fMASTER/PH. The PH value is determined by the connections movement of ions and impurities within the silicon and is tested at 30°C of the PH0, PH1 and PH2 pins as described in the Applications Information under otherwise nominal operating conditions. Long term drift is specified section. as ppm/√kHr due to the typically nonlinear nature of the drift. To calculate
Note 5:
Frequency accuracy is defined as the deviation from the f drift for a set time period, translate that time into thousands of hours, take OUT equation. f the square root and multiply by the typical drift number. For instance, a MASTER = 20MHz • 10k/RSET, fOUT = 20MHz • 10k/(RSET • PH), PH = 3, 4, 5, 6, 7 or 8. year is 8.77kHr and would yield a drift of 888ppm at 300ppm/√kHr. Drift
Note 6:
Guaranteed by 5V test. 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.
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.
typicAl perForMAnce chArActeristics Frequency Error vs RSET, V+ = 2.7V Frequency Error vs RSET, V+ = 5V Frequency Error vs Temperature
5 5 1.00 TA = 25°C TA = 25°C 4 GUARANTEED MAX 4 OVER TEMPERATURE 0.75 3 3 GUARANTEED MAX 0.50 2 2 OVER TEMPERATURE 1 TYPICAL MAX 1 TYPICAL MAX 0.25 0 0 0 TYPICAL MAX –1 TYPICAL MIN –1 –0.25 –2 –2 GUARANTEED MIN FREQUENCY ERROR (%) FREQUENCY ERROR (%) TYPICAL MIN OVER TEMPERATURE FREQUENCY ERROR (%) –0.50 –3 –3 TYPICAL MIN –4 GUARANTEED MIN –0.75 OVER TEMPERATURE –4 –5 –5 –1.00 10k 100k 1M 10M 10k 100k 1M 10M –40 –20 0 20 40 60 80 RSET (Ω) RSET (Ω) TEMPERATURE (°C) 6909 G01 6909 G02 6909 G03
Supply Current Supply Current Supply Current vs Supply Voltage vs RSET (SSFM Enabled) vs RSET (SSFM Disabled)
1800 3000 3000 PH = 3, SSFM ENABLED CLOAD = 5pF CLOAD = 5pF 1600 CLOAD = 5pF V+ = 5V, PH = 3 RLOAD = 5k V+ = 5V, PH = 3 RLOAD = 5k 2500 2500 1400 RSET = 20k V+ = 5V, PH = 8 1200 2000 2000 V+ = 5V, PH = 8 1000 (µA) (µA) R Y SET = 400k 1500 V+ = 2.7V, PH = 3 Y 1500 800 V+ = 2.7V, PH = 3 Y CURRENT (µA) RSET = 100k I SUPPL I SUPPL 600 1000 1000 SUPPL 400 RSET = 2M 500 500 200 V+ = 2.7V, PH = 8 V+ = 2.7V, PH = 8 0 0 0 2.7 3.2 3.7 4.2 4.7 10k 100k 1M 10M 10k 100k 1M 10M SUPPLY VOLTAGE (V) RSET (Ω) RSET (Ω) 6909 G05 6909 G04 6909 G06 6909fa 4 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
