SSM2166

Complete Microphone Conditioner with Variable Compression & Noise Gating
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Product Details

The SSM2166 integrates a complete and flexible solution for conditioning microphone inputs in computer audio systems. It is also excellent for improving vocal clarity in communications and public address systems. A low noise, voltage-controlled amplifier (VCA) provides a gain that is dynamically adjusted by a control loop to maintain a set compression characteristic. The compression ratio is set by a single resistor and can be varied from 1:1 to over 15:1 relative to a user-defined rotation point; signals above the rotation point are limited to prevent overload and to eliminate popping. In the 1:1 compression setting, the SSM2166 can be programmed with a fixed gain of up to 20 dB; this gain is in addition to the variable gain in other compression settings. The input buffer can also be configured for front-end gains of 0 dB to 20 dB. A downward expander (noise gate) prevents amplification of noise or hum. This results in optimized signal levels prior to digitization, thereby eliminating the need for additional gain or attenuation in the digital domain that could add noise or impair accuracy of speech recognition algorithms. The compression ratio and time constants are set externally. A high degree of flexibility is provided by the VCA gain, rotation point, and noise gate adjustment pins.

The SSM2166 is an ideal companion product for audio codecs used in computer systems. The SSM2166 is available in a 14-lead SOIC package and is guaranteed for operation over the extended industrial temperature range of −40°C to +85°C.

Applications

  • Microphone preamplifiers/processors
  • Computer sound cards
  • Public address/paging systems
  • Communication headsets
  • Telephone conferencing
  • Guitar sustain effects generators
  • Computerized voice recognition
  • Surveillance systems
  • Karaoke and DJ mixers

Product Lifecycle

checked Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Reference Materials

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Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

SSM2166 Material Declaration
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Overview

11 Reviews
11 out of 11 (100%) customers recommend this product.
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Most Helpful Review

by DFM
The microphone preamplifier performs well, but I had an issue with some random, spark or pop sonding noise using the standard configuration as described in Fig. 26 of the datasheet. After quite some tests and one chip killed in action, I solved the issue adding a resistor of 330 kOhm between the preamplifier inputs (pins six and seven). On the contrary, a resistor from pin seven (audio +in) to ground made the problem worse.

Most Recent Review

by Anonymous
Using it in a Contract mic pre-amp and it seems like this little silicon-spider fits the need (noise gating and compression). The downside is, i had many other applications in mind but the low headroom does not leave much space for higher voltages (say +/-12V signals).

All Reviews

by Anonymous, 15 Jan 15
Very versatile
Using it in a Contract mic pre-amp and it seems like this little silicon-spider fits the need (noise gating and compression). The downside is, i had many other applications in mind but the low headroom does not leave much space for higher voltages (say +/-12V signals).
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by Devilll, 11 Jun 14
SSM2166
Excellent product. Easy to use, the features are nice, and sounds great!
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by Théophile, 17 Apr 14
A pro product
Very good product. It need a buffer at its input to accept all signals. I recommand it in studio project, or guitar/bass effects
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by JDoe, 17 Apr 14
ssm2166 has wide range of applications...
I used it for guitar effect and I was pleasantly surprised how good it is, It'd be excellent if there was a feature like j-fet preamp buffer (turned on/off by logic level on a pin). But it's a snag - the chip is really good.
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by cristian, 18 Feb 14
excelent performance
i was very impressed about easy integration of software that I have dowbloaded and your dsp products. very easy way to program an dsp. also the quality of the products is very good
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by jottees, 13 Feb 14
this product can be used on different ways
this integrated circuit was used as intended to his functions, will be used also near at hand in completely other function.
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by AudioNisse, 14 Nov 13
Good Performance after some corrections
We have tried several units of SSM2166 from different deliveries. The problem we have faced is a disturbing click when picking up low level sound. Different layouts have been tried, but the clicking sound each few seconds remained. Fortunately we noticed the review by "DFM" posted in July 2013. Adding a resistor between pins 6 (-IN) and 7 (+IN) solved the problem. Not only on the latest prototype, but also on all older versions. Great and simple solution. Maybe this option could be included into future datasheet editions of SSM2166.
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by ja1pwk, 7 Nov 13
threshhold level need more adjustablity...
The generaly speekings, the mssm2166a works great, but sometime a noise gate on level is bigger than a controled output levels. so when start speakings top tunes saund bigger then little bit smoll sound follows. That is the only disappointment.
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by DFM, 29 Jul 13
Good functionality, although some unexpected problems
The microphone preamplifier performs well, but I had an issue with some random, spark or pop sonding noise using the standard configuration as described in Fig. 26 of the datasheet. After quite some tests and one chip killed in action, I solved the issue adding a resistor of 330 kOhm between the preamplifier inputs (pins six and seven). On the contrary, a resistor from pin seven (audio +in) to ground made the problem worse.
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by Anonymous, 4 Feb 13
Great device. I hope it has a future.
I work in the pro audio field, mostly musical instruments. I would like to design in more SSM parts but with the future of these in some question, I have to work on a batch by batch basis rather than committing them in larger projects. Whilst I understand you have to play a volume game, out here in the audio world it is a quality game. More emphasis is being put on analog processing and I am under more pressure to do it. THe SSM parts make this task easier. I would like to implore you continue the SSM range. The 2146 for instance is a great device from its flexibility and quality and is hard to beat with other products.
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by Anonymous, 4 Feb 13
This audio analog product should be expanded..
This is a great product unparalleled so far.. Like the SSM 2164 that has a 'Last Time buy' status... Too sad that such a great product that is so popular in the design & development area will be extinguished soon.. Very sad. My feedback is PLEASE KEEP THE SSM FAMILY PRODUCTS AVAILABLE FOR PEOPLE LIKE ME THAT DON'T FIND ANY SUBSTITUTE IN THE MARKET FOR THEM. THESE PRODUCTS DELIVER !!!! AT LEAST KEEP THE SSM2164 AVAILABLE..
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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