TS258

3-6

2005/02 rev. A

Circuit Description

The TS258 made using two internally compensated, two-stage operational amplifiers. The first stage performs not

only the first stage gain function but also performs the level shifting and transconductance reduction functions. By

reducing the transconductance, a smaller compensation capacitor (only 5.0pF) can be employed, thus saving chip

area. Another feature of this input stage is that the input common mode range can include the negative supply or

ground, in single supply operation, without saturating either the input devices or the differential to single-ended

converter. The second stage consists of a standard current source load amplifier stage.

Each amplifier is biased from an internal-voltage regulator, and which has a low temperature coefficient thus giving

each amplifier good temperature characteristics as well as excellent power supply rejection.