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My new AD1851 DAC
My new AD1851 DAC
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Old 31st March 2007, 11:06 AM   #1
Kochkurov Maxim is offline Kochkurov Maxim  Russian Federation
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Join Date: Dec 2003
Location: Russia
Smile My new AD1851 DAC

It's my new DAC builded on AD1851N-J DAC and DF1700 digital filter. This DAC has 4 SPDIF inputs and 1 I2S (TTL) input with 16.344MHz or 11.2896 MCLK output for CD transport synchronisation. The DAC uses ultra low jitter oscillator (typical jitter about 5-7 ps RMS) and reclock unit, which may work in 3 modes: SYNCHRONOUS, when used synchronous interface as I2S or synchronous SPDIF, ASYNCHRONOUS, when used SPDIF, or BYPASS.

Supported chips:

DAC: AD1851,AD1861,AD766,AD1856,PCM56,PCM61.

DF: PMD100, SM5813, DF1700, DF1704, DF1706(with 3.3V supply), SM5842 (only in 18 bit output mode )

Assembled DAC photos are here
Schematic, partlist and assembly are here
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Old 20th February 2016, 12:53 PM   #2
hollowman is offline hollowman  United States
Join Date: Jan 2007
Location: Los Angeles, California
This DAC (and its superior 18-bit brother AD1861) are still in production at $5.00/each:
AD1851 Datasheet and Product Info | Analog Devices
They are mono DACs with supposedly classic R2R multibit topology, no built-in digital filtering, and current (I) out. The nomenclature AD1861 is similar to the highly-touted AD1862 (cousin). Yet I see almost no activity with this DAC in DIY or manuf. circles.
Not sure why it's unpopular given its AD/R2R "heritage" -- was it only recently put back into production?
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Old 20th February 2016, 01:37 PM   #3
jean-paul is offline jean-paul  Netherlands
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You react to a post dating from 2007 ......
It's only audio. Member of the non modular PCB design committee
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Old 21st February 2016, 05:17 AM   #4
hollowman is offline hollowman  United States
Join Date: Jan 2007
Location: Los Angeles, California
Default DIY R2R fanboyz missed out?

Originally Posted by jean-paul View Post
You react to a post dating from 2007 ......
I thought all MAJOR manufs. of audio DAC ICs went Delta-Sigma even before this. Since R2R/multibit seems popular in DIY (i.e., new-old-stock), the fact that the above AD is still in production -- but never paid any audiophile attn. to -- is strange.
Why no enthusiasm for this DAC when subpar new-old-stockers (TDA1387/1545A/1543) are touted? TDA1541A is fine, but the higher grades are way overpriced.
I bet if someone started a Kickstarter campaign -- call it "modern R2R multi-bit" -- made it pretty with nice layout on the PCB with that AD1861, marketed it right, it'd go "Pono".
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Old 6th April 2016, 11:01 AM   #5
kASD is offline kASD
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Your concern is valid, even I am also surprised to see no mentioning of these R2R chips anywhere in DIY circles.
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Old 30th August 2016, 12:25 AM   #6
vizion is offline vizion  United States
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I think the DevilSound DAC has these chips
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