The MC145506, MC145507, and MC145508 are per channel codec–filter PCM mono–circuits. These devices perform the voice digitization and reconstruction, as well as the band limiting and smoothing required for PCM systems. These devices have HCMOS compatible digital outputs and otherwise supplement the MC145500 – MC145505 series of PCM codec–filters.

MC145506 (22–Pin Package, HCMOS Output Version of MC145502)

? Selectable Peak Overload Voltages (2.5 V, 3.15 V, 3.78 V)

? Push–Pull Analog Output with Gain Adjust

? 64 kHz to 4.1 MHz Transmit and/or Receive Data Clock Rate

? All the Features of the MC145507 Listed Below

MC145507 (16–Pin Package, HCMOS Output Version of MC145503)

? Transmit Bandpass and Receive Low–Pass Filters on Chip

? Pin Selectable Mu/A Law Companding with Corresponding Data Format

? On–Chip Precision Reference Voltage (3.15 V)

? Power Dissipation of 50 mW, Power Down of 0.1 mW at ±5 V

? Three Terminal Transmit Input Operational Amplifier

? Automatic Prescaler Accepts 128 kHz, 1.536 MHz, 1.544 MHz, 2.048 MHz, and 2.56 MHz for Internal Sequencing

? Separate Transmit and Receive Data Clocks

MC145508 (16–Pin Package, HCMOS Output Version of MC145505) Same as MC145507 Except:

? Common 64 kHz to 4.1 MHz Transmit/Receive Data Clock

? Separate CCI Pin with Automatic Prescaler Accepts 128 kHz, 1.536 MHz, 1.544 MHz, 2.048 MHz, and 2.56 MHz for Internal Sequencing