Window Comparator With Independent Adjustments Corporation

The window Comparator shown in Figure 1 circumvents these problems with independent trip and window adjust- ments. The HA2841 op amp (selected because it has high speed and low input currents) adds the input signal to the trip voltage developed by RT. The window width voltage RW is summed into the output of the op amp as an offset volt- age. The op amp has two feedback loops each of which con- tains a steering Diode D1 or D2. The high open loop gain of the op amp insures that one Diode will always be forward biased unless RW supplies the feedback current, thus when the sum of the input voltages (closed loop gain is one) and IRW passes through zero the current ow switches from one Diode to the other. The output Comparator senses the polar- ity Switch across the Diodes and the Comparator output volt- age changes. The HA4905 Comparator has inputs that CAN work from the 15V supplies, thus the input voltage swing is matched to the op amps output voltage swing. Even though the input sec- tion of the HA4905 is connected to 15V, the output section CAN be connected from +5V to ground, thus offering a TTL compatible output voltage. By Intersil Corporation
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HA2841 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
HA2841 circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

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