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Burr-Brown Corporation 4082/03 General Purpose Comparator
Electrical Specifications: see picture gallery
- Relay and lamp driving capability up to 100mA load
- Transient Protection to 400mA
- Response time and hysteresis adjust
The Model 4082/03 is a low cost hybrid integrated circuit comparator in a dual-in-line package. It combines a low-cost differential input comparator with an open collector transistor output stage capable of sinking I00 mA. With transient protection of 400mA, this unit is an excellent choice to drive lamps, relays, and other devices with high transient requirements. In addition, the open collector output wilIaccept up to + 30VDC making the 4082/03 compatible with MOS circuitry and high noise immunity logic as well as TTL and DTL devices. The 4082/03 operates from ±15VDC power. Additional outputs are provided for response time control and hysteresis response.
Model 4082/03 will function when power is applied and the output IQad is connected between Pin 9 and Pin 13. The load may be resistor; lamp, or relay. A simplified diagram in .shown in Figure 1. Either input may be connected to common or to some reference voltage. Whenever the (+In) input is positive with respect to the (-In) input, the output transistor is switched ON. The load power (+ V It) may be any voltage up to + 30VDC.
Hysteresis may be added by means of positive response as shown in Figure 2. The amount of hysteresis is approximately: Hysteresis ... 26V Ro/Rr + Ro, Rf~ 10kn Adding hysteresis provides better noise immunity, but at the price of decreased switching resolution.
Response time can be decreased if desired by adding capacitance between Pin 11 and Pin 12 (common). This will limit the rise and fall times of the output voltage, which in turn limits turn-on surge currents when driving lamps. .