TP3020

The TP3020 is monolithic PCM CODEC implemented with double-poly CMOS technology.The TP3020 intended for -law applications and contains logic for law sianaling insertion and extraction.Each device contains separate D/A and A/D circuitry, all  necessary sample and hold capacitors, a precision voltage reference and internal auto-zero circuit. A serial control port allows an external controller to individually assign the PCM input and output ports to one of up to 32 time slots or to place the CODEC into a power-down mode.Alternately, the TP3020 may be operated in a fixed time slot mode.Both devices are intended to be used with the TP3040 monolithic PCM filter which provides the input anti-aliasing funcnon for the encoder and smoothes the output of the decoder and corrects for the sin x/x distortion introduced by the decoder sample and hold output.

Features of the TP3020 are:(1)low operation power---45 mW typical; (2)low standby power----1 mW typical; (3)±5V operation; (4)TTL compatible digital interface; (5)time slot assignment or alternate fixed time slot modes; (6)internal precision reference; (7)internal sample and hold capacitors; (8)internal auto-zero circuit; (9)TP3020----law coding with signaling capabilities; (10)synchronous or asynchronous operation.

The absolute maximum ratings of the TP3020 can be summarized as:(1)Vcc with respect to GND:7V;(2)Vbb with respect to GND:-7V;(3)lead temperature range:300;(4)storage temperature:-65 to 150;(5)voltage at any analog input or output:Vbb-0.3 to Vcc+0.3V;(6)voltage at any analog input or output:GND-0.3 to Vcc+0.3V;(7)operating temperature:-25 to 125.The desired action will take place upon the occurrence of the second frame syno pulse following the first pulse of CLKc.Assigning a tithe slot to either the encoder or decoder will automatically power-up the entire CODEC circuit. The DX output and Dp input, however, will be inhibited for one additional frame to allow the analog circuitry time to stabilize.If separate time slots are to be assigned to the encoder and the decoder, the encoder time slot should be assigned first. This is necessary because up to four frames are required to assign both time slots separately, but only three frames are necessary to activate the DX output. If the encode time slot has not been updated the PCM data will be outputted during the previously assigned time slot which may now be assigned to another CODEC.