Author Topic: AD4630-24 new SAR ADC from Analog Devices  (Read 1294 times)

0 Members and 1 Guest are viewing this topic.

Offline KT88

  • Regular Contributor
  • *
  • Posts: 184
  • Country: de
AD4630-24 new SAR ADC from Analog Devices
« on: September 26, 2021, 04:34:26 pm »
There is a new SAR ADC in pre-release from Analog Devices:2MSPS, 24bits, +/-0.9ppm max INL...
https://www.analog.com/en/products/ad4630-24.html#product-overview

Cheers

Andreas
 
The following users thanked this post: 3roomlab

Offline antintedo

  • Contributor
  • Posts: 41
  • Country: pl
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #1 on: September 26, 2021, 06:06:11 pm »
What is even more impressive, the typical INL is just 0.1ppm, even for a single ended input.
Noise seems a bit high in comparison to the best SD and SAR ADCs.
 

Offline KT88

  • Regular Contributor
  • *
  • Posts: 184
  • Country: de
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #2 on: September 26, 2021, 06:26:36 pm »
Noise at full bandwidth can't be compared directly. A comparison at 1Hz (NSD: −166 dBFS/Hz typical) would be a meaningfull comparison / FoM. Combining the two ADCs would score additional 3dB...
 

Offline Kleinstein

  • Super Contributor
  • ***
  • Posts: 9974
  • Country: de
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #3 on: September 26, 2021, 06:36:06 pm »
The higher frequency noise looks good. For the lower frequency one would have to see in real life. There may of may no be sifnificant extra /1f noise at the reference input and maybe correlation.

For the linearity don't forget the input buffer. It is not that easy to find a buffer with so little INL.

Another impressive point is the power it needs. Just from the ADC power it would fit battery operation.
 

Offline KT88

  • Regular Contributor
  • *
  • Posts: 184
  • Country: de
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #4 on: September 26, 2021, 06:46:58 pm »
No dedicated driver needeed in many cases - it takes only 600nA input bias current at DC.
 

Offline Echo88

  • Frequent Contributor
  • **
  • Posts: 678
  • Country: de
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #5 on: September 26, 2021, 08:39:52 pm »
Very impressive INL, but the package...  :-\
 

Online jbb

  • Frequent Contributor
  • **
  • Posts: 958
  • Country: nz
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #6 on: September 26, 2021, 09:13:36 pm »
Yowza!
Dynamic range at full sample rate is allegedly 106dB, ie around 17 bits.

Package is 0.8mm pitch BGA, which is a bit inconvenient but not terrible. I suspect it could be broken out on a 4 layer PCB without going to fancy PCB processes.

(I did a design in my last job with a 0.4mm pitch part and that was really annoying to prototype.)
 

Online coppercone2

  • Super Contributor
  • ***
  • Posts: 5742
  • Country: us
  • $
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #7 on: September 26, 2021, 09:25:31 pm »
lol, they need to make a grid on top of the chip so you can solder it upsidedown if you wanted to with direct connections between the pads so you can probe them, the whole BGA thing is ridiculous

like if the chip connection package was 3d metal printed with a good sintering machine or whatever after the die was made. then I would hate them less if you can probe them with fine needles or even put parts ontop of the chip deadbug style
The technican is really being screwed over hard by like 0.5cm^2 of copper sheet conductors
« Last Edit: September 26, 2021, 09:27:40 pm by coppercone2 »
 

Offline KT88

  • Regular Contributor
  • *
  • Posts: 184
  • Country: de
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #8 on: September 26, 2021, 09:47:58 pm »
The pinout isn't all that bad...the inputs are situated at an outer row (1) surrounded by GND-pins. The interface pins are also 1st and second row (7+8) to the edge. Placing some test points close to the package still gets you closeer to the die than in any other 64-pin package.
To get to such specs a more traditional package would possibly result in slightly inferiour specs...
 

Offline chickenHeadKnob

  • Frequent Contributor
  • **
  • Posts: 959
  • Country: ca
  • doofus programus semi-retiredae
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #9 on: September 27, 2021, 12:43:37 am »
The pinout isn't all that bad...the inputs are situated at an outer row (1) surrounded by GND-pins. The interface pins are also 1st and second row (7+8) to the edge. Placing some test points close to the package still gets you closeer to the die than in any other 64-pin package.
To get to such specs a more traditional package would possibly result in slightly inferiour specs...

QFN64 with .5mm pitch would be much better for us hobby peeps, and it can't be all that bad for lead inductance. I wish they offered in both package styles so we could see the performance difference (if any).
 

Offline arcnet

  • Contributor
  • Posts: 5
  • Country: de
Re: AD4630-24 new SAR ADC from Analog Devices
« Reply #10 on: September 27, 2021, 12:53:29 am »
The pinout isn't all that bad...the inputs are situated at an outer row (1) surrounded by GND-pins. The interface pins are also 1st and second row (7+8) to the edge. Placing some test points close to the package still gets you closeer to the die than in any other 64-pin package.
To get to such specs a more traditional package would possibly result in slightly inferiour specs...

And this ADC has even the capacitors integrated... 2 uF for the reference, 1 uF for VDD5 and VDD1_8 and 0.2 uF for VDDIO.
IOGND and GND are shared. Many (prototype) pcb manufacturers have 0.1 mm width and spacing nowadays as standard so no problem and for prototyping one might get even away with simple vias as pads (0.2 mm drill and 0.1 mm annular ring) and solder them from the bottom.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf