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MC13110A Datasheet(PDF) 36 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 36 Page - Motorola, Inc |
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36 / 68 page  MC13110A/B MC13111A/B 36 MOTOROLA ANALOG IC DEVICE DATA Transmit Audio Path This portion of the audio path goes from “C In” to “Tx Out”. The “C In” pin will be ac–coupled. The audio transmit signal path includes automatic level control (ALC) (also referred to as the Compressor), Tx mute, limiter, filters, and Tx gain adjust. The ALC provides “soft” limiting to the output signal swing as the input voltage slowly increases. With this technique the gain is slightly lowered to help reduce distortion of the audio signal. The limiter section provides hard limiting due to rapidly changing signal levels, or transients. This is accomplished by clipping the signal peaks. The ALC, Tx mute, and limiter functions can be enabled or disabled via the MPU serial interface. The Tx gain adjust can also be remotely controlled to set different desired signal levels. The typical maximum output voltage at “Tx Out” should be approximately 0 dBV @ THD = 5.0%. Figures 82 to 86 represent the transmit audio path filter response. The filter response attenuation, again, is very definite above 3800 Hz. This is the filter cutoff frequency. Inband (audio), wideband, and ripple characteristics are also shown in these graphs. The compressor transfer characteristics, shown in Figure 87, has three different slopes. A typical compressor slope can be found between –55 and –15 dBV. Here the slope is 2.0. At an input level above –15 dBV the automatic level control (ALC) function is activated and prevents hard clipping of the output. The slope below –55 dBV input level is one. This is where the compressor curve ends. Above 5.0 dBV the output actually begins to decrease and distort. This is due to supply voltage limitations. In Figure 88 the ALC function is off. Here the compressor curve continues to increase above –15 dBV up to –4.0 dBV. The limiter begins to clip the output signal at this level and distortion is rapidly rising. Similarly, Figure 68 (ALC and Limiter Off) shows to compressor transfer curve extending all the way up to the maximum output. Finally, Figure 90 through 93 show the Tx Out signal versus several combinations of ALC and Limiter selected. Figure 81 is the noise data measured for the MC13110A/13111A. This data is for 0 dB gain setting and –20 dBV (100 mVrms) audio levels. Figure 81. Tx Path Noise Data Transmit Scrambler Transmit Gain (dB) Amp_Out (dBV) Tx_Out (dBV) off/on muted muted < –95 off –9.0 < –95 –83 off 0 < –95 –74 off 10 < –95 –64 on (MC13110A) –9.0 < –95 –82 on (MC13110A) 0 < –95 –73 on (MC13110A) 10 –< –95 –63 Mic Amp Like the Speaker Amp the Mic Amp is also an inverting rail–to–rail operational amplifier. The noninverting input terminal is connected to the internal VB reference. External resistors and capacitors are used to set the gain and frequency response. The “Tx In” input is ac–coupled. |
Similar Part No. - MC13110A |
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Similar Description - MC13110A |
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