I might be an OpAmp newbie but... (watch out for PDF viewer problems) - Page 1
Forum section: electronics / projects

author: con-f-use
author_rank: Unknown
timestamp: December 10, 2014, 02:36:38 pm
content: ...100 A quiescent current? Okay, it's an old data sheet but how did this slip by in more than two different locations?

author: Paul Price
author_rank: Super Contributor
timestamp: December 10, 2014, 02:44:08 pm
content: There is a mistake on the data sheet, the "A" is not correct to specity current in Amperes, should be "uA"Reason..ummm..pot has been legalized in many US states? else maybe no "mu" letter on the keyboard?

author: TKt48
author_rank: Newbie
timestamp: December 10, 2014, 02:53:54 pm
content: I see empty space on last image vertical axis label: ( A). It looks like missing font or improper symbol coding. They put the correct symbol, but it is not displaying correctly.

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 10, 2014, 03:00:05 pm
content: Quote from: TKt48 on December 10, 2014, 02:53:54 pmSame in the other 2 images.

author: con-f-use
author_rank: Unknown
timestamp: December 10, 2014, 03:14:24 pm
content: I got it, I just found it strange, that they don't proofread and a little funny. Think of the implications. It's very prominent. Doesn't instil too much confidence.

author: richard.cs
author_rank: Super Contributor
timestamp: December 10, 2014, 03:16:29 pm
content: It probably looks fine on a pdf viewer with the right fonts installed, and presumably that's what they used when proofreading.

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 10, 2014, 03:21:46 pm
content: It's not even uA:But it is here:The Microchip Technology Inc. MCP6001/2/4 family ofoperational amplifiers (op amps) is specificallydesigned for general-purpose applications. This familyhas a 1 MHz gain bandwidth product and 90° phasemargin (typ.). It also maintains 45° phase margin (typ.)with 500 pF capacitive load. This family operates froma single supply voltage as low as 1.8V, while drawing100 ?A (typ.) quiescent current.

author: Zero999
author_rank: Super Contributor
timestamp: December 10, 2014, 03:22:20 pm
content: What PDF viewer are you using?It the mu symbol displays properly for me using Firefox's built-in PDF viewer.http://ww1.microchip.com/downloads/en/DeviceDoc/21733j.pdfTry the online PDF viewer linked below:http://view.samurajdata.se/

author: con-f-use
author_rank: Unknown
timestamp: December 10, 2014, 03:39:55 pm
content: Now it's getting interesting, because we had a version with A, one with mA (PA0PBZ) and the latetest says uA. The A version in my opening post is very old, tough.

author: bktemp
author_rank: Super Contributor
timestamp: December 10, 2014, 03:45:58 pm
content: I can see µA in every datasheet you have attached. The problem ist your PDF viewer.

author: macboy
author_rank: Super Contributor
timestamp: December 10, 2014, 04:18:11 pm
content: confirming that the problem is on your side:

author: con-f-use
author_rank: Unknown
timestamp: December 10, 2014, 07:05:51 pm
content: That explains it, thank you. I've been unhappy with evince for a while, that might just be the last drop. Doesn't explain PA0PBZ's mA, tough.

author: tom66
author_rank: Super Contributor
timestamp: December 10, 2014, 07:15:26 pm
content: Confusingly enough, many PDF viewers will substitute µ with m, and ? with W...This can lead to some odd datasheets!"The 100 W series resistance can cause a 100 mV offset voltage"

author: con-f-use
author_rank: Unknown
timestamp: December 10, 2014, 10:36:22 pm
content: I wonder if the EEVBlog forum will ever support a decent range of unicode characters.

author: c4757p
author_rank: Super Contributor
timestamp: December 10, 2014, 10:39:27 pm
content: Quote from: con-f-use on December 10, 2014, 02:36:38 pmAt first, I thought you were referring to theLM0901A1411090451C...

author: retiredcaps
author_rank: Super Contributor
timestamp: December 10, 2014, 10:42:54 pm
content: Quote from: con-f-use on December 10, 2014, 07:05:51 pmEvince works for me with Lubuntu 14.04.1.

author: tom66
author_rank: Super Contributor
timestamp: December 10, 2014, 11:17:55 pm
content: Quote from: con-f-use on December 10, 2014, 10:36:22 pmHah! That WAS supposed to be an omega symbol.

author: denelec
author_rank: Regular Contributor
timestamp: December 11, 2014, 12:03:22 am
content: Quote from: con-f-use on December 10, 2014, 07:05:51 pmMaybe the problem is font related. An older font that lacks greek letters.If not, you shouldevict"evince".

author: Whales
author_rank: Super Contributor
timestamp: December 11, 2014, 01:38:29 am
content: Evince: random interface redesigns to hide your controls every few months. Viva la gnome 3!The backend (by memory) is the poppler rendering library. A few different viewers probably use this, or have options to use others (like the mupdf backend), so be wary.