National Semiconductor TP3070 TP3071 TP3070-X Manual
TP3070, TP3071, TP3070-X COMBO® II Programmable PCM CODEC/Filter is a second-generation combined PCM CODEC and Filter device optimized for digital switching applications on subscriber line and trunk cards. Using advanced switched capacitor techniques, COMBO II combines transmit bandpass and receive lowpass channel filters with a companding PCM encoder and decoder. The devices are A-law and µ-law selectable and employ a conventional serial PCM interface capable of being clocked up to 4.096 MHz. A number of programmable functions may be controlled via a serial control port. Channel gains are programmable over a 25.4 dB range in each direction, and a programmable filter is included to enable Hybrid Balancing to be adjusted to suit a wide range of loop impedance conditions. Both transformer and active SLIC interface circuits with real or complex termination impedances can be balanced by this filter, with cancellation in excess of 30 dB being readily achievable when measured across the passband against standard test termination networks. To enable COMBO II to interface to the SLIC control leads, a number of programmable latches are included; each may be configured as either an input or an output. The TP3070 provides 6 latches and the TP3071 5 latches.
Brand: National
File format: PDF
Size: 402 KB
MD5 Checksum: D89783ED78F3D6E8F18724E0A2409EE7
Publication date: 15 February, 2012
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PDF Link: National Semiconductor TP3070 TP3071 TP3070-X Manual PDF