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OP490 Datasheet(PDF) 10 Page - Analog Devices |
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OP490 Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page OP490 Rev. E | Page 10 of 16 INPUT VOLTAGE PROTECTION The OP490 uses a PNP input stage with protection resistors in series with the inverting and noninverting inputs. The high breakdown of the PNP transistors coupled with the protection resistors provides a large amount of input protection, allowing the inputs to be taken 20 V beyond either supply without damaging the amplifier. MICROPOWER VOLTAGE-CONTROLLED OSCILLATOR An OP490 in combination with an inexpensive quad CMOS switch comprise the precision VCO of Figure 22. This circuit provides triangle and square wave outputs and draws only 75 μA from a 5 V supply. A acts as an integrator; S1 switches the charging current symmetrically to yield positive and negative ramps. The integrator is bounded by B, which acts as a Schmitt trigger with a precise hysteresis of 1.67 V, set by Resistors R5, R6, and R7, and the associated CMOS switches. The resulting output of A is a triangle wave with upper and lower levels of 3.33 V and 1.67 V. The output of B is a square wave with almost rail-to-rail swing. With the components shown, frequency of operation is given by the equation fOUT = VCONTROL (Volts) × 10 Hz/V but this is easily changed by varying C1. The circuit operates well up to a few hundred hertz. VCONTROL 1/4 OP490 A 1/4 OP490 B SQUARE OUT IN/OUT IN/OUT IN/OUT IN/OUT CONT CONT CONT CONT VSS VDD OUT/IN OUT/IN OUT/IN OUT/IN C1 75nF TRIANGLE OUT R5 200k Ω R6 200k Ω +15V 7 6 5 R1 200k Ω R2 200k Ω +15V R4 200k Ω 1 4 11 2 3 R3 100k Ω S1 S2 S3 S4 R8 200k Ω +5V +5V +5V R7 200k Ω 114 213 312 411 510 69 78 Figure 22. Micropower Voltage Controlled Oscillator |
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