LTC1799 Linear Technology Corporation, LTC1799 Datasheet
LTC1799
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LTC1799 Summary of contents
Page 1
... SET operation (≤1.5% frequency error) without the need for external trim components. The LTC1799 operates with a single 2.7V to 5.5V power supply and provides a rail-to-rail, 50% duty cycle square wave output. The CMOS output driver ensures fast rise/fall times and rail-to-rail switching. The frequency-setting ...
Page 2
... LTC1799C 5kHz ≤ f ≤ 20MHz, LTC1799I/H 1kHz ≤ f ≤ 5kHz 20MHz ≤ f ≤ 33MHz + 5kHz ≤ f ≤ 10MHz 5kHz ≤ f ≤ 10MHz, LTC1799C 5kHz ≤ f ≤ 10MHz, LTC1799I/H 1kHz ≤ f ≤ 5kHz 10MHz ≤ f ≤ 20MHz + < 1. ∆ ...
Page 3
... I = – 1mA OH LTC1799H I = – 4mA 5V 1mA OL LTC1799C 4mA 5V 1mA OL LTC1799H I = 4mA 3V 1mA OL LTC1799C 4mA 3V 1mA OL LTC1799H I = 4mA Pin Floating ∞ L Pin ∞ Pin Floating ∞ L Pin ∞ ...
Page 4
... 5pF ÷1 (5V) ÷10 (5V) ÷100 (5V) ÷100 (3V) ÷10 (3V) ÷1 (3V) 1k 10k 100k 1M 10M 100M OUTPUT FREQUENCY, f (Hz) OUT 1799 G04 LTC1799 Output Operating at 10MHz 3V 10k 10pF SET L 1V/DIV 1799 G06 25ns/DIV 1799 G07 sn1799 1799fbs ...
Page 5
... SET (Pin 3): Frequency-Setting Resistor Input. The value of the resistor connected between this pin and V mines the oscillator frequency. The voltage on this pin is held by the LTC1799 to approximately 1.13V below the V voltage. For best performance, use a precision metal film resistor with a value between 10k and 200k and limit the capacitance on this pin to less than 10pF ...
Page 6
... MO R ⎝ ⎠ SET The LTC1799 is optimized for use with resistors between 10k and 200k, corresponding to master oscillator fre- quencies between 0.5MHz and 10MHz. Accurate frequen- cies up to 20MHz (R = 5k) are attainable if the supply SET voltage is greater than 4V. ...
Page 7
... DIV (Pin ÷100 ⇒ master oscillator frequencies greater than 10MHz (R LTC1799 may suffer reduced accuracy with a supply voltage less than 4V. After choosing the proper divider setting, determine the correct frequency-setting resistor. Because of the linear correspondence between oscillation period and resis- tance, a simple equation relates resistance with frequency. ⎧ ...
Page 8
... If a switching power supply is used to power up the LTC1799, and if the ripple of the power supply is more than a few tens of millivolts, make sure the switching frequency and its harmonics are not related to the output frequency of the LTC1799 ...
Page 9
... SET Block Diagram. This loss of accuracy will become notice- able when the magnitude of I PROG The frequency variation of the LTC1799 is still monotonic. Figure 9 shows how to implement the concept shown in Figure 8 by connecting a second resistor, R SET pin and a ground referenced voltage source, V ...
Page 10
... This lower limit U TYPICAL APPLICATIO S Low Power 80Hz to 8kHz Sine Wave Generator ( OSC OUT 3V LTC1799 SET 3V 100 0.1µF GND SW1 OPEN SET DIV ...
Page 11
... U S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.95 REF 1.22 REF 1.50 – 1.75 2.80 BSC 1.4 MIN (NOTE 4) PIN ONE 0.95 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LTC1799 2.90 BSC (NOTE 4) 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S5 TSOT-23 0302 sn1799 1799fbs 11 ...
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... GND THERMISTOR 3 4 SET DIV 1799 TA03 R : YSI 44011 800 765-4974 T Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Shutting Down the LTC1799 5V 74AC04 1 + ON/SHDN V OUT C1 LTC1799 R1 0.1µF 2 GND 10k 3 SET 1799 TA08 ...