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MC13110A Datasheet(PDF) 33 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 33 Page - Motorola, Inc |
33 / 68 page ![]() MC13110A/B MC13111A/B 33 MOTOROLA ANALOG IC DEVICE DATA Receive Audio Path The Rx Audio signal path begins at “Rx Audio In” and goes through the IC to “E Out”. The “Rx Audio In”, “Scr Out”, and “E In” pins are all ac–coupled. This signal path consists of filters; programmable Rx gain adjust, Rx mute, and volume control, and finally the expander. The typical maximum output voltage at “E Out” should be approximately 0 dBV @ THD = 5.0% . Figures 71 to 73 represent the receive audio path filter response. The filter response attenuation is very sharp above 3900 Hz, which is the cutoff frequency. Inband (audio), out–of–band, and ripple characteristics are also shown in these graphs. The group delay (Figure 75) has a peak around 6.5 kHz. This spike is formed by rapid change in the phase at the frequency. In practice this does not cause a problem since the signal is attenuated by at least 50 dB. The output capability at “Scr Out” and “E Out” are shown in Figures 76, 77, and 78. The results were obtained by increasing the input level for 2.0% distortion at the outputs. In Figure 70, noise data for the Rx audio path is shown. At Scr Out, the noise level clearly rises when the scrambler is enabled. However, assuming a nominal output level of –20 dBV (100 mVrms) at the 0 dB gain setting, the noise floor is more than 56 dB below the audio signal. However, the noise data at E Out and SA Out is much more improved. Speaker Amp The Speaker Amp is an inverting rail–to–rail operational amplifier. The noninverting input is connected to the internal VB reference. External resistors and capacitors are used to set the gain and frequency response. The “SA In” input pin must be ac–coupled. The typical output voltage at “SA Out” is 2.6 Vpp with a 130 Ω load. The speaker amp response is shown in Figures 79 and 80. Data Amp Comparator The data amp comparator is an inverting hysteresis comparator. Its open collector output has an internal 100 k Ω pull–up resistor. A band pass filter is connected between the “Det Out” pin and the “DA In” pin with component values as shown in the Application Circuit schematic. The “DA In” input signal needs to be ac–coupled, too. Figure 70. Rx Path Noise Data Receive Scrambler Receive Gain (dB) Volume (dB) SCR_Out (dBV) E_Out (dBV) SA_Out (dBV) off/on muted muted < –95 < –95 < –95 off –9.0 –14 –92 < –95 < –95 off 0 0 –85 < –95 < –95 off 1.0 16 –76 < –95 < –95 on (MC13110A/B) –9.0 –14 –85 < –95 < –95 on (MC13110A/B) 0 0 –77 < –95 < –95 on (MC13110A/B) 10 16 –66 < –95 < –95 |
Similar Part No. - MC13110A |
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Similar Description - MC13110A |
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