SSM2040: Difference between revisions

The '''SSM2040''' IC is a [[Filters|4-pole filter]] from [[Solid State Micro Technology Forfor Music]] (SSM). Regarded as one of the best sounding filters, because of the way resonance and small amounts of soft distortion when overdriven, can add harmonics to the original signal.<ref name="jg">''[https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit]'', by James Gideon, 2006</ref>

Designed by [[Dave Rossum]] of [[E-mu Systems]] and used in the first 2 versions of the [[Sequential Circuits Prophet 5]]. Early SSM chips were often defective, and having to pay royalties led Sequential to switch to [[OnChip Systems|Curtis]] ICs in later versions of the Prophet 5.<ref name="msl">[https://web.archive.org/web/20141015041238/http://www.siliconbreakdown.com/msl/ssm2040History.html SSM2040 Voltage Controlled Filter Chip History], Mad Science Lab 2008</ref><ref>[https://web.archive.org/web/20141015041311/http://www.siliconbreakdown.com/msl/ssm2040manual.html SSM2040 VCF with LFO], Mad Science Lab 2008</ref>

The device's cutoff frequency can be [[Exponential|exponentiallyexponential]]ly [[voltage controlled]] over a 10,000 to 1 range. It is an extremely flexible circuit building block which can be used in virtually any active filter design including low-pass, high-pass, band-pass and notch. Roll-off characteristics can be selected to be Butterworth, Chebyshev, Cauer, Bessel or any other filter type.<ref name="data">[httphttps://www.sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM2044 data sheet]</ref>

* [https://web.archive.org/web/20160811193937/http://analogue.bytenoise.co.uk/message/70a13992bd45f021330686a0f3795f991885e041 discrete SSM2040-style filter] by [[Jürgen Haible]], 1997.

* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit], by James Gideon, 2006

* [https://web.archive.org/web/20160211063850/http://www.amsynths.co.uk:80/mysynths/filter-bank/am8040-e-mu-systems-low-pass-filter/ AMSynths AM8040]

* [https://web.archive.org/web/20160620213600/http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2]

* [https://web.archive.org/web/20190613230500/http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B], based on the SSM2040 designed by [[Jim Patchell]]

* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.

* [https://web.archive.org/web/20150425232001/http://www.tiptopaudio.com/z2040.php Tiptop Audio Z2040]

* [https://web.archive.org/web/20130512191822/http://hammer.ampage.org/files/Device1-6.PDF VCF/Phase Shifter] by Craig Anderton, AMS-100 guitar processor, Device 6, 1979

* [https://web.archive.org/web/20130626235303/http://vedicscapes.bandcamp.com/track/model-2040 Vedic Scapes Model 2040], uses the HM2040

* [https://web.archive.org/web/20100706170531/http://hammer.ampage.org/files/Device1-4.PDF Voltage Controlled Phase Shifter module] by Craig Anderton, AMS-100 guitar processor, Device 4, 1979

* [httphttps://www.sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM2044 data sheet]

* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, {{ISBN |0-8306830-275362755-3}}, Chapter 6: ''A four-pole lowpass VCF – SSM2040''

* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982,ISBN {{ISBN|0-672-21833-X}}, pages 125-126, 135-137, 141

* ''Two ICs For Electronic Music – SSM2020 And SSM2040'' by Dave Rossum, [[Electronotes]] 78, Volume 9, 1977, p. &nbsp;15

* ''Reader's Circuits – VCF With SSM2040'' by Rich Ryan, Electronotes 84, Volume 9, 1977, p. &nbsp;17

* ''A Fourth Order State-Variable Filter'' by Bob Chidlaw, Electronotes 99, Volume 11, 1979, p. &nbsp;3

* ''Musical Applications of Microprocessors'' by [[Hal Chamberlin]], Hayden, 1985 {{ISBN |0-8104-5768-7}}, pages 218-220, 599, 603

* ''The Smooth Phaser'' by Thomas Henry, Electronic Musician, June 1988, pp. &nbsp;78, 80-83.

* SSM2040 data sheet at [https://web.archive.org/web/20150924171345/http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon] or [http://www.digisound80.co.uk/digisound/other_documents/brochure_files/SSM2040.pdf Digisound80.co.uk]

* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM2040 Integrated Circuit], by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible.

* ''[https://web.archive.org/web/20190613230522/http://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. &nbsp;5

* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.

* ''[https://driveweb.googlearchive.comorg/fileweb/d20190613221410/0Bx5_5krPS9HMcThRRHRObjRwMUkhttps://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Build the PGS Lowpass Voltage Controlled Filter]'', Common Mode, January 1983, Number 1, pp. 10-15&nbsp;10–15

* ''[https://driveweb.googlearchive.comorg/fileweb/d20190613221410/0Bx5_5krPS9HMcThRRHRObjRwMUkhttps://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Synthesizer Phase Shifter]'' by Thomas Henry, Polyphony, October 1984, pp. 14-17&nbsp;14–17.