Hi there.
I have a question about AD8604.
http://www.analog.com/static/imported-files/data_sheets/AD8601_8602_8604.pdf
Please tell me how unused pins are treated.
Is the following treatment fine?
+IND: GND
-IND: GND
Vout: OPEN
I checked the datasheet and input voltage range can accept 0V.
So INpins should be GND, I think.
Please give me advice.
Best regards,
Tarzan
Thanks for your answer, Kris.
Let me ask you the following point.
Are there any specifc reasons that unused amplifr are treated in a buffer configration?
When it comes to layout, it's easier to treat like VIN+=GND ,VIN-=GND, Vout=OPEN.
If I configurate unused pins for VIN+=GND ,VIN-=GND, Vout=OPEN, what would happen?
Best regards,
Tarzan.
Tarzan,
You want to connect the unused section as a follower. See:
http://www.analog.com/static/imported-files/tech_articles/MS-2212.pdf
Also, see page 10 of: http://cds.linear.com/docs/en/datasheet/10134fd.pdf
Obviously, we don't check all of our op amps (over 350) to see if there is interaction under
abnormal conditions. Some quads have one biasing network, some have two, and some
have four. If one op amp operates outside of its range, it can affect the bias network which
will affect the other sections and cause them to malfunction.
Harry
Hi Tarzan,
It is recommended that you configure the unused amplifiers in a buffer configuration, that is, -IN is connected to Vout. You can then connect the +IN pin to ground. Actually, the general rule is that +IN can be connected to any voltage within the input voltage range of the amplifier. Since the AD8604 accepts input voltages from 0 to 3V, you are correct that the +IN pin may be connected to GND.
I hope this helps!
Kris