Datasheet LTC6908-1, LTC6908-2 (Analog Devices) - 3

LTC6908-1/LTC6908-2
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.7V to 5.5V, RL = 5k, CL = 5pF unless otherwise noted. The modulation is turned off (MOD is connected to OUT2) unless otherwise specified. RSET is defined as the resistor connected from the SET pin to the V+ pin. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ΔfOUT Frequency Accuracy (Note 4) V+ = 2.7V 250kHz ≤ fOUT ≤ 5MHz ±0.5 ±1.5 % 250kHz ≤ fOUT ≤ 5MHz l ±2 ±2.5 % 50kHz ≤ fOUT < 250kHz l ±2.5 ±3.5 % V+ = 5V 250kHz ≤ fOUT ≤ 5MHz ±1 ±2 % 250kHz ≤ fOUT ≤ 5MHz l ±2.5 ±3 % 50kHz ≤ fOUT < 250kHz l ±3 ±4 % 5MHz < fOUT ≤ 10MHz l ±3.5 ±4.5 % RSET Frequency Setting Resistor Range V+ = 2.7V | ΔfOUT | ≤ 1.5% 20 400 k | ΔfOUT | ≤ 2.5% l 20 400 k | ΔfOUT | ≤ 3.5% l 400 2000 k V+ = 5V | ΔfOUT | ≤ 2% 20 400 k | ΔfOUT | ≤ 3% l 20 400 k | ΔfOUT | ≤ 4% l 400 2000 k | ΔfOUT | ≤ 4.5% l 10 20 k ΔfOUT/ΔT Frequency Drift Over Temperature RSET = 100k l ±0.004 %/°C ΔfOUT/ΔV+ Frequency Drift Over Supply (Note 4) V+ = 2.7V to 3.6V, RSET = 100k l 0.04 0.25 %/V V+ = 4.5V to 5.5V, RSET = 100k l 0.4 0.9 %/V Period Variation RSET = 100k, MOD Pin = V+, GND or OPEN l ±7.5 ±10 ±12.5 % (Frequency Spreading) Long-Term Stability of Output 300 ppm/√kHr Frequency (Note 8) Duty Cycle (Note 5) No Modulation, 250kHz ≤ fOUT ≤ 1MHz l 45 50 55 % V+ Operating Supply Range l 2.7 5.5 V IS Power Supply Current RSET = 2000k, RL = ∞, fOUT = 50kHz, MOD Pin = V+ V+ = 5V l 0.4 0.65 mA V+ = 2.7V l 0.4 0.6 mA RSET = 20k, RL = ∞, fOUT = 5MHz, MOD Pin = GND V+ = 5V l 1.25 1.7 mA V+ = 2.7V l 0.9 1.3 mA VIH_MOD High Level MOD Input Voltage l V+ – 0.4 V VIL_MOD Low Level MOD Input Voltage l 0.4 V IMOD MOD Pin Input Current (Note 6) MOD Pin = V+, V+ = 5V l 2 4 µA MOD Pin = GND, V+ = 5V l –4 –2 µA VOH High Level Output Voltage (Note 6) V+ = 5V IOH = –0.3mA l 4.75 4.9 V (OUT1, OUT2) IOH = –1.2mA l 4.4 4.7 V V+ = 2.7V IOH = –0.3mA l 2.35 2.6 V IOH = –0.8mA l 1.85 2.2 V VOL Low Level Output Voltage (Note 6) V+ = 5V IOL = 0.3mA l 0.05 0.15 V IOL = 1.2mA l 0.2 0.5 V V+ = 2.7V IOL = 0.3mA l 0.1 0.3 V IOL = 0.8mA l 0.4 0.7 V tr Output Rise Time (Note 7) V+ = 5V 6 ns V+ = 2.7V 11 ns tf Output Fall Time (Note 7) V+ = 5V 5 ns V+ = 2.7V 9 ns Rev B For more information www.analog.com 3 Document Outline Features Applications Description Absolute Maximum Ratings Electrical Characteristics Pin Functions Operation Applications Information Typical Applications Package Description Typical Application