The MC145481 is a general purpose per channel PCM Codec–Filter with pin selectable Mu–Law or A–Law companding, 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.
   
• Single 2.7 to 5.25 V Power Supply
• Typical Power Dissipation of 8 mW @ 3 V, Power–Down of 0.01 mW
• Fully–Differential Analog Circuit Design for Lowest Noise
• Transmit Band–Pass and Receive Low–Pass Filters On–Chip
• Active R–C Pre–Filtering and Post–Filtering
• Mu–Law and A–Law Companding by Pin Selection
• On–Chip Precision Reference Voltage of 0.886 V for a – 5 dBm TLP
    @ 600 Ω
• Push–Pull 300 Ω Power Drivers with External Gain Adjust