Analog Devices has announced an opamp with *100V* rating and otherwise decent specs.
http://www.analog.com/en/precision-op-amps/high-supply-voltage-amplifiers/ada4700-1/products/product.html
http://www.analog.com/static/imported-files/data_sheets/ADA4700-1.pdf
Caveats:
* SOIC only. (Of course.)
* >$3 in lots of 100. No stock yet at the usual distributors.
The 100V rail-rail limit suggests things like a driver for ~~100W loudspeaker amp, grid-drivers for quite large vacuum-tube amps, general-purpose bench buffer/booster for overdriving systems under test (a simple 24VAC PT and this chip will give the 25Vrms level we formerly need an H-P 200AB to get).
And... regulator for Phantom Power.
Output swings within 2V of either rail; input within 3V. Claims no phase-flop on input overdrive.
Output current is 30mA rated, >60mA limit. If also working with +/-45V rails, you are as likely to hit the thermal limit (85 deg C junction max, 45 deg C/W) as the current limit.
Slew/Speed and Hiss are not spectacular, though useful. Hiss is really quite low considering the front-end is filthy with emitter-followers. So is the back-end. Really just one voltage-gain stage, which is why the phase line is quite mellow.
http://www.analog.com/en/precision-op-amps/high-supply-voltage-amplifiers/ada4700-1/products/product.html
http://www.analog.com/static/imported-files/data_sheets/ADA4700-1.pdf
Caveats:
* SOIC only. (Of course.)
* >$3 in lots of 100. No stock yet at the usual distributors.
The 100V rail-rail limit suggests things like a driver for ~~100W loudspeaker amp, grid-drivers for quite large vacuum-tube amps, general-purpose bench buffer/booster for overdriving systems under test (a simple 24VAC PT and this chip will give the 25Vrms level we formerly need an H-P 200AB to get).
And... regulator for Phantom Power.
Output swings within 2V of either rail; input within 3V. Claims no phase-flop on input overdrive.
Output current is 30mA rated, >60mA limit. If also working with +/-45V rails, you are as likely to hit the thermal limit (85 deg C junction max, 45 deg C/W) as the current limit.
Slew/Speed and Hiss are not spectacular, though useful. Hiss is really quite low considering the front-end is filthy with emitter-followers. So is the back-end. Really just one voltage-gain stage, which is why the phase line is quite mellow.
