The Spark Gap Podcast - Episode 33

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Show Synopsis

Karl and Corey explore the analog world a bit by discussing Analog to Digital and Digital to Analog Converters.

Part of the Podcast

Karl’s Part of the Podcast:

Supertex HV5623: http://www.microchip.com/wwwproducts/Devices.aspx?product=HV5623 Just for the curious; The traditional Nixie tube driver chips: http://neonixie.com/ic/index.html

Corey’s Part:

Texas Instrument’s INA226: http://www.ti.com/product/ina226

ADCS

Here is what you should read regarding ADCs: http://www.analog.com/library/analogDialogue/archives/43-09/EDCh%206%20Converter.pdf

Ti also put out a really nice pocket reference book, but it is behind sign-in wall. Lame!: http://www.ti.com/lsds/ti/amplifiers-linear/precision-amplifier-pocket-reference-e-book.page?DCMP=pocketref&HQS=hpa-pa-opamp-pocketref-univ-bti-ebook-en

Types of ADCs

Good document explaining the different types of ADCs: http://www.onmyphd.com/?p=analog.digital.converter

Help choosing the correct type of ADC: http://www.analog.com/library/analogdialogue/archives/39-06/architecture.html

SAR ADCs

Understanding ADCs app-note from Maxim: http://www.maximintegrated.com/en/app-notes/index.mvp/id/1080

I like this app note just for it’s picture. It shows ADCs as what they are, a big bank of little capacitors: http://www.ti.com.cn/cn/lit/an/slyt176/slyt176.pdf

Types of ADC Inputs

This 2 page pdf does a much better job then me expalining ADC Input types. I have now bookmarked it. You should too: http://cds.linear.com/docs/en/product-selector-card/2PB_sarinputtypesfb.pdf

ADC Errors

Here is an excellent ADC from Atmel. Read this one first: http://www.atmel.com/Images/Atmel-8456-8-and-32-bit-AVR-Microcontrollers-AVR127-Understanding-ADC-Parameters_Application-Note.pdf

This is not the same as TI’s pocket guide, but just as good as it relates to ADC errors: http://www.ti.com/lit/an/slaa013/slaa013.pdf

Another good PDF on ADC errors. Simple pictures explaining INL and DNL: http://www.cypress.com/?docID=32695

Here is the ADC that I was comparing against the Atmega328p’s ADC: http://www.analog.com/en/products/analog-to-digital-converters/ad-converters/ad7685.html

Driving ADCs

I believe this all from the same handbook from Analog, but it is really well written so I link it in again; Using Opamps with ADCs: http://www.analog.com/library/analogDialogue/archives/39-05/Web_Ch3_final.pdf

This is a great companion to the Analog Devices handbook. It is a huge collection of ADC driver circuits and explanations of why you would use each different type: http://www.ti.com/lit/an/sloa098/sloa098.pdf

Grounding ADCs

Just one man’s opinion on splitting ADC’s ground planes: http://www.hottconsultants.com/pdf_files/june2001pcd_mixedsignal.pdf

A good collection of the thoughts of the internet concerning ADC grounding: http://techref.massmind.org/techref/noises.htm#unsplit_ground

DACs

Here is the only thing you need to read regarding DACs. Good stuff: http://www.analog.com/library/analogDialogue/archives/43-09/EDCh%206%20Converter.pdf