Analog Front End Chip or/and Analog-SoC | Suggestions?

[lorth]

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 like R820T or AD9364...) but I haven't had much luck finding anything.

So, what I'm looking for is on the line of the Analog part of the  PSoC5LP, or a Anadigm's FPAA. It does not need to be an "analog FPGA" ie, reconfigurable, but it would be nice, though.

Any suggestions?
Thank you!

[Scrts]

Did you check AFEs at Analog Devices? Not sure if they can do from DC, but maybe you will find something.

[tszaboo]

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.

[Howardlong]

What kind of sampling rate and bandwidth are you after?

[danadak]

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.

[autobot]

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.

[lorth]

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.

[tszaboo]

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.

I 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.

[danadak]

Here is a mostly complete list of the modules you can instantiate in a PSOC (not ALL
at once, chip is limited by total amount of logic, but its big enough with multiple
resources to do most applications w/o external stuff) -

Regards, Dana.

[timb]

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.

You 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...

[splin]

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.

You 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...

Eh? Apart from <1% accuracy, PSoC5LP doesn't appear to meet any of 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.

[tszaboo]

Eh? Apart from <1% accuracy, PSoC5LP doesn't appear to meet any of 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.

Ask 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.

[Marco]

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...

Those 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.