2
Lucent Technologies Inc.
T7570 Programmable PCM Codec
with Hybrid-Balance Filter
Data Sheet
October 1996
Table of Contents
Content
Page
Features ...................................................................................................................................................................1
Description ...............................................................................................................................................................1
Pin Information .........................................................................................................................................................3
Functional Description ..............................................................................................................................................5
Powerup Initialization ............................................................................................................................................5
Powerdown State ..................................................................................................................................................5
Transmit Filter and Encoder ..................................................................................................................................5
Decoder and Receive Filter ..................................................................................................................................6
PCM Interface .......................................................................................................................................................6
Serial Control Port ................................................................................................................................................6
Programmable Functions ......................................................................................................................................7
Hybrid-Balance Filter ..........................................................................................................................................11
Programming the Filter .......................................................................................................................................12
Absolute Maximum Ratings ....................................................................................................................................13
Handling Precautions .............................................................................................................................................13
Electrical Characteristics ........................................................................................................................................14
dc Characteristics ...............................................................................................................................................14
Transmission Characteristics ..................................................................................................................................15
Timing Characteristics ............................................................................................................................................20
Applications ............................................................................................................................................................25
Outline Diagrams ....................................................................................................................................................26
28-Pin PLCC .......................................................................................................................................................26
Ordering Information ...............................................................................................................................................27