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部品型式

SSM2166

製品説明
仕様・特性

Microphone Preamplifier with Variable Compression and Noise Gating SSM2166 Data Sheet 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 may 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. FEATURES Complete microphone conditioner in a 14-lead SOIC package Single 5 V operation Adjustable noise gate threshold Compression ratio set by external resistor Automatic limiting feature—prevents ADC overload Adjustable release time Low noise and distortion Power-down feature 20 kHz bandwidth (±1 dB) 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 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. 10 COMP RATIO = 10:1 0 OUTPUT (dBu) –10 GENERAL DESCRIPTION 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 COMP RATIO = 2:1 –20 COMP RATIO = 1:1 –30 –40 –60 –70 –60 –50 –40 –30 INPUT (dBu) –20 –10 0 00357-002 –50 Figure 1. Compression and Gating Characteristics with 10 dB of Fixed Gain (The Gain Adjust Pin Can Be Used to Vary This Fixed Gain Amount) FUNCTIONAL BLOCK DIAGRAM AND TYPICAL SPEECH APPLICATION 10µF + BUF OUT –IN AUDIO +IN 0.1µF VCAIN 3 V+ VCAR 4 2 1kΩ BUFFER GAIN ADJUST 14 2.3kΩ 6 1kΩ 7 VCA OUTPUT 13 9 R2 10kΩ + 1µF 5 LEVEL DETECTOR 11 POWER DOWN 1 GND 8 AVG CAP 17kΩ ROTATION SET 10 + 22µF NOISE GATE SET 500kΩ CONTROL SSM2166 12 V+ 10µF (OPTIONAL) + COMP RATIO SET 25kΩ 00357-001 R1 10kΩ Figure 2. Rev. F Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©1996–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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SSM2142PZ-01 SSM2142PZ-4085C SSM2142PZAD SSM2142PZ-R SSM2142PZ-RL
SSM2142S SSM2142S-14 SSM2142SAD SSM2142-SMD SSM2142S-REEL
SSM2142S-REELADSMD SSM2142SSO16 SSM2142SZ SSM2142SZ-REEL SSM2142SZ-REEL7
SSM2142SZROHS SSM2142XRWC-AO SSM2143 SSM21435 SSM2143-821
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SSM21652SREEL7 SSM21652SZREEL7 SSM2165S SSM2166 SSM2166A
SSM2166AR SSM2166ARZ SSM2166AS SSM2166ASZPBF SSM2166G
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SSM2166SRZ SSM2166S-SMD-R SSM2166SSO14 SSM2166SZ SSM2166SZ-REEL
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SSM2167-1RMZ-R7 SSM2167-1RMZ-REEL SSM21671RMZREEL7 SSM2167ARMZ SSM-21T-P14
SSM-21T-P14LFSN

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