TP3210

The TP3210 is a complete electronic SLIC and PCM COMBO CODEC/filter module intended to interface the analog subscriber line to a PCM highway. It is designed to meet the requirements for U.S. central office and remote switching applications. When used in conjunction with a simple, non-critical, external protection network, two resistors and a ring relay, the TP3210 forms a complete line circuit, handling all the BORSCHT functions.The TP3210 module consists of a line driver, a line receiver,a line impedance control circuit, a hybrid balance circuit, a line supervision circuit, a ring supervision circuit, three posttive relay drivers, a TP3054 -Law COMBO GODEC/filter and a serial control interface. Any changes in the status of the subscriber loop generate an interrupt, allowing the device to be used in either polled or interrupt driven applications.

Features of the TP3210 are:(1)complete COMBO CODECIFilter and SLIC functions; (2)exceeds LSSGR central office specifications; (3)in-band on-hook transmission capability; (4)resistive loop feed with current limit; (5)power denial mode; (6)compatible with loop start and ground start signalling; (7)automatic ring trip compatible with all U.S ringing conditions; (8)four selectable hybrid balance networks; (9)three relay drivers; (10)thermal overload protection; (11)compatible with inexpensive protection networks; (12)withstands 500V RTN to GND surge; (13)compatible with standard PCM highway; (14)small physical sae and minimal external components.

The absolute maximum ratings of the TP3210 can be summarized as:(1)Vcc to GND:-0.5 to 7V;(2)Vbb or GNDD:0.5 to -7V;(3)Vbat to RTN:0.5 to -70V;(4)storage temperature:-65 to 150;(5)voltage at any analog input or output:Vcc+0.3 to GND-0.3V;(6)lead temperature:300;(7)operating temperature:-25 to 125.The loop supervision circuit operates in the normal (non-ringing) state. At normal battery polarity, off-hook is indicated when loop current exceeds nominally 8.5 mA and on-hook  indicated  when the  current falls below nominally 6.5 mA, providing a 2 mA hysteresis. The Loop Supervision has been designed to maintain the dial pulse make interval greater than 25 ms regardless of the distortion introduced by the loop characteristics. At reversed battery polarity, off-hook is detected when loop current exceeds nominally 12 mA and on-hook indicated when current falls below nom-finally 10 mA. A logic "1" at status bit S7 indicates on-hook, while a logic "0" indicates off-hook. For Ground Start signalling, TIP is opened with an external relay. Qff-hook is indicated when the current from RING to ground exceeds nominally 17 mA and on-hook when the current falls below nominally 13 mA.