LTC6991 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.25V to 5.5V, RST = 0V, DIVCODE = 0 to 15(NDIV = 1 to 221), RSET = 50k to 800k, RLOAD = 5k, CLOAD = 5pF unless otherwise noted.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS tOUT Output Clock Period 1.024m 34,360 Seconds fOUT Output Frequency 29.1µ 977 Hz ∆fOUT Frequency Accuracy (Note 4) 29.1µHz ≤ fOUT ≤ 977Hz ±0.8 ±1.5 % l ±2.2 % ∆fOUT/∆T Frequency Drift Over Temperature l ±0.005 %/°C ∆fOUT/∆V+ Frequency Drift Over Supply V+ = 4.5V to 5.5V l 0.23 0.55 %/V V+ = 2.25V to 4.5V l 0.06 0.16 %/V Long-Term Frequency Stability (Note 11) 90 ppm/√kHr Period Jitter (Note 10) NDIV = 1 15 ppmRMS NDIV = 8 7 ppmRMS BW Frequency Modulation Bandwidth 0.4 • fOUT Hz tS Frequency Change Settling Time (Note 9) 1 Cycle Analog Inputs VSET Voltage at SET Pin l 0.97 1.00 1.03 V ∆VSET/∆T VSET Drift Over Temperature l ±75 µV/°C RSET Frequency-Setting Resistor l 50 800 kΩ VDIV DIV Pin Voltage l 0 V+ V ∆VDIV/∆V+ DIV Pin Valid Code Range (Note 5) Deviation from Ideal l ±1.5 % VDIV/V+ = (DIVCODE + 0.5)/16 DIV Pin Input Current l ±10 nA Power Supply V+ Operating Supply Voltage Range l 2.25 5.5 V Power-On Reset Voltage l 1.95 V IS Supply Current RL = ∞, RSET = 50k V+ = 5.5V l 135 170 µA V+ = 2.25V l 105 135 µA RL = ∞, RSET = 100k V+ = 5.5V l 100 130 µA V+ = 2.25V l 80 105 µA RL = ∞, RSET = 800k V+ = 5.5V l 65 100 µA V+ = 2.25V l 55 85 µA 6991fc For more information www.linear.com/LTC6991 3 Document Outline Features Applications Typical Application Description 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
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