MC14400

The MC14400 PCM mono-circuit is a PCM codes-filter intended for standard word interleaved synchronous or asynchronous applications. The TbC pin on MC14400 is the input to both the TDC and CCI functions in the pin description.Consequently, for MSI=8 kHz, TDC can be one of five discrete frequencies. These are 128 kHz (40 to 60% duty)1.536, 1.544, 2.048 or 2.56 MHz. (For other data clock frequencies see MC14402 or MC14405).The internal reference is sot for 3.15 volts peak full scale, and the full scale input level at Txl and output level at Rx0 is 6.3 volts peak-to-peak.This is the +3 d8m0 level of the PCM mono-circuit. All other functions of MC14400 are described in the pin description.

The MC14400 has the following features including:(1)output drive capability for 600 and 900 Ohm Loads of + 12dBm; (2)synchronous and asynchronous operation; (3)on-chip attendent interrupt conferencing; (4)transmit bandpass and receive low-pass filters on chip.An analog test mode is activated by connecting MSI and CCI to 128kHz.In this mode, the input of the codec (the output of the Tx filter) is available on the PDI pin.This input is a DC auto zeroed access to the A/D side of tha codec.

The absolute maximum ratings of the MC14400 are:(1)operating temperature range:-40 to 85; (2)storage temperature range:-85 to 150; (3)DC supply voltage:-0.5 to 13V; (4)DC current drain per pin:10mA.The RSI input allows the selection of three anrerem overload or full scale voltages independent of the internal or external reference mode. The selection of maximum signed level is made by connecting RSI to Vpp, VAG or VSS.The various modes of operation are summarized in the table below. The internal reference is designed to give internal gains equal to those obtained with an external 2.5 volt reference.

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