MC145484
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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5 V PCM Codec-Filter
The MC145484 is a general purpose per channel PCM Codec- Filter with pin selectable Mu- Law or A- Law panding, and is offered in 20- pin SOG and SSOP packages. This device performs the voice digitization and reconstruction as well as the band limiting and smoothing required for PCM systems. This device is designed to operate in both synchronous and asynchronous applications and contains an on- chip precision reference voltage. This device has an input operational amplifier whose output is the input to the encoder section. The encoder section immediately low- pass filters the analog signal with an active R- C filter to eliminate very high frequency noise from being modulated down to the passband by the switched capacitor filter. From the active R- C filter, the analog signal is converted to a differential signal. From this point, all analog signal processing is done...
