The MC145483 is a 13–bit linear PCM Codec–Filter with 2s complement data format, 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 the voice coding in digital communication systems. This device is designed to operate in both synchronous and asynchronous applications and contains an on–chip precision reference voltage.

• Single 3 V Power Supply

• 13–Bit Linear ADC/DAC Conversions with 2s Complement Data Format

• Typical Power Dissipation of 8 mW, Power–Down of 0.01 mW

• Fully–Differential Analog Circuit Design for Lowest Noise

• Transmit Band–Pass and Receive Low–Pass Filters On–Chip

• Transmit High–Pass Filter May be Bypassed by Pin Selection

• Active R–C Pre–Filtering and Post–Filtering

• On–Chip Precision Reference Voltage of 0.886 V for a – 5 dBm TLP@ 600 Ω

• 3–Terminal Input Op Amp Can be Used, or a 2–Channel Input Multiplexer

• Receive Gain Control from 0 dB to – 21 dB in 3 dB Steps in Synchronous Operation

• Push–Pull 300 Ω Power Drivers with External Gain Adjust