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SSM2165-2S 데이터시트(PDF) 9 Page - Analog Devices |
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SSM2165-2S 데이터시트(HTML) 9 Page - Analog Devices |
9 / 10 page REV. A SSM2165 –9– rms detector averaging time, and the decay time of the gate. Both compression ratio and decay time are usually determined by critical listening to the intended audio input. STEP 7. Record Values With the power removed from the test fixture, measure and record the values of the RCOMP and CAVG. 300 45 COMPRESSION REGION LIMITING REGION NOISE GATING REGION 0.5 2 30 40 INPUT – mV Figure 18. Transfer Characteristic SUMMARY We have implemented the transfer characteristic of Figure 18. For inputs below the 500 µV noise gate threshold, circuit and background noise will be downward expanded (gain-reduced) at a ratio of approximately 1:3. That is, a –1 dB change in the noise will result in –3 dB decrease at the output. Above thresh- old, the signal will increase at a rate of 1 dB for each 2 dB input increase, until the rotation point is reached at an input of approximately 40 mV. In the limiting region, the compression ratio increases to approximately 15:1. That is, a 15 dB increase in input will produce a 1 dB increase at the output, so there will be little further increase for higher level inputs. Other Versions The SSM2165 is an 8-lead version of the 14-lead SSM2166 which is recommended for applications requiring more versatil- ity. The SSM2166 allows selection of noise gate threshold and rotation point, and allows the buffer to provide up to 20 dB of gain. Power-down and mute functions are also built in. Custom- ized versions of the SSM2165 are available for large volume users. The wide dynamic range of the SSM2165 makes it useful in many applications other than microphone signal conditioning such as a sustain generator for guitars. For further information, contact your Analog Devices representative. |
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