AD 707 Opamp - Any Good ??

[arupg]

Hello:

Recently, I happen to come across a fairly highend digital processor - the Theta Pro Gen V. Looking into its analog board, I find PMI made AD707 Opamps.

Are they any good ? The Theta unit used to cost $6k some 10 yrs back and wonder whether this opamp is at par with say today's OPA627 etc.

Feedback will be most appreciated.

 

[Mooly]

Hi,
Look here www.analog.com/UploadedFiles/Data_Sheets/AD707.pdf
Depends how and for what it is used as.

 

[jan.didden]

Read the data sheet. This is a DC opamp, the AC performance is pathetic. Probably used as a servo amp for DC precision.

Jan Didden

 

[NJantonioItaly]

I found that a blown AD707JN (-15 V on the output) in my Theta Gen Va created a cascade of events that resulted in several blown transistors, burned resistors and melted polystyrene capacitors.. Would it be a good idea to pro actively substitute all of them with newer ones or some other substitute?

 

[Mooly]

Melted polystyrene caps suggests far more of a problem than a blown opamp. It sounds more like some extreme high voltage event occurred that understandably would cause masses of damage.

 

[NJantonioItaly]

Thanks for the advice! I substituted all blown components except the AD707 and nothing is melting, although I have a +20V on the output. Hopefully, replacing the AD707 will fix that...

 

[peranders]

You can search for an opamp with slew rate less than 10 V/us, +-15 V supply voltage (check how high voltage you have), offset voltage 100 uV or less, noise less than 10nV/hz. DIL08 package or SO08 with an adapter. You have lots of options.