Analog Front End Chip or/and Analog-SoC | Suggestions? - Page 1
Forum section: electronics / general

author: lorth
author_rank: Contributor
timestamp: March 11, 2016, 02:12:48 am
content: Hey all!So I've been looking for an "Analog Front End" chip, that would include a bunch of OPamps, with multiple topologies (fixed or not), voltage references, current sources, mixers filters...These components, should work from DC (<10KHz, so no SDR frontends likeR820TorAD9364...) but I haven't had much luck finding anything.So, what I'm looking for is on the line of the Analog part of thePSoC5LP, or aAnadigm's FPAA. It does not need to be an "analog FPGA" ie, reconfigurable, but it would be nice, though.Any suggestions?Thank you!

author: Scrts
author_rank: Frequent Contributor
timestamp: March 11, 2016, 02:18:03 pm
content: Did you check AFEs at Analog Devices? Not sure if they can do from DC, but maybe you will find something.

author: tszaboo
author_rank: Super Contributor
timestamp: March 11, 2016, 02:26:03 pm
content: I did a search for these kind of parts in the past, but they are either unobtanium, the performance is pathetic, expensive or application specific.If you like general purpose analog stuff, check the AD5592R.

author: Howardlong
author_rank: Super Contributor
timestamp: March 11, 2016, 03:31:50 pm
content: What kind of sampling rate and bandwidth are you after?

author: danadak
author_rank: Super Contributor
timestamp: March 12, 2016, 01:39:12 pm
content: PSOC comes with a .1% reference, costs have dropped substantially,software gui based drag and drop, has ohmmeter tool for routing evalu-ation. SAR to 12 bits, DelSig to 20 bits.What resolution, accuracy, common mode, precision are you seeking ?Regards, Dana.

author: autobot
author_rank: Regular Contributor
timestamp: March 13, 2016, 01:14:53 am
content: I think renesas have some programmable AFE's. If you use them, please share your experiences , because there's not a lot of info about them.

author: lorth
author_rank: Contributor
timestamp: March 14, 2016, 02:28:24 am
content: Thanks for your replies!As for performance, i'm looking at BW <10MHz, >10b of DACs/ADCs, components with <1%Accu, low Is (<10pA) and Vos (<1mV) for the Opamps (decent GBW >20MHz), possibility for filters...I will check Renesas and let you know.

author: tszaboo
author_rank: Super Contributor
timestamp: March 14, 2016, 01:54:26 pm
content: Quote from: autobot on March 13, 2016, 01:14:53 amI would not hold my breath for Renesas. Usually they are the NDA guys, who will not be talking to you unless six digit orders. And then you dont need to ask, because you are told to use them.

author: danadak
author_rank: Super Contributor
timestamp: March 14, 2016, 10:48:26 pm
content: Here is a mostly complete list of the modules you can instantiate in a PSOC (not ALLat once, chip is limited by total amount of logic, but its big enough with multipleresources to do most applications w/o external stuff) -Regards, Dana.

author: timb
author_rank: Super Contributor
timestamp: March 15, 2016, 12:05:09 am
content: Quote from: lorth on March 14, 2016, 02:28:24 amYou can do all that with a PSoC5LP. It's insanely flexible! It has a highly configurable series of internal analog busses that are completely separate from the digital section of the chip.The only analog limitation I've run into is the inputs only support unipolar levels (0-5V), so you can't process bipolar signals without an external opamp for level shifting. (Well, I guess you could use -2.5V for VSSA and 2.5V for VDDA and then level shift the digital I/O or perhaps you could use GND for VSSD and 2.5V for VCCD? Hmmm, I might have to try that...

author: splin
author_rank: Frequent Contributor
timestamp: March 18, 2016, 07:01:14 pm
content: Quote from: timb on March 15, 2016, 12:05:09 amEh? Apart from <1% accuracy, PSoC5LP doesn't appear to meetanyof the requirements with 12 bit ADC limited to 192kSPS (you need 20MSPS minimum per channel). The opamp's Ib is specified at 10pA typical so perhaps 10nA max (not specified), GPW only 3MHz min and Vos 2mV. I seriously doubt you will find anything to meet your requirements if I haven't misunderstood your need for high speed ADCs and/or DACs.

author: tszaboo
author_rank: Super Contributor
timestamp: March 18, 2016, 07:51:21 pm
content: Quote from: splin on March 18, 2016, 07:01:14 pmAsk anyone, they will tell you that the Psoc is good for EVERYTHING. I seriously doubt I've ever seen so many fanboys, PIC guys included. Because Psoc has some 10 cent opamps integrated.

author: Marco
author_rank: Super Contributor
timestamp: March 18, 2016, 08:52:27 pm
content: Quote from: lorth on March 14, 2016, 02:28:24 amThose are some pretty aggressive specs even for individual opamps ... good luck.Do you really need continuous input? If you can occasionally ground it then Vos is irrelevant.