Datenblatt-Suchmaschine für elektronische Bauteile |
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TP3070J Datenblatt(PDF) 1 Page - National Semiconductor (TI) |
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TP3070J Datenblatt(HTML) 1 Page - National Semiconductor (TI) |
1 / 26 page TP3070, TP3071, TP3070-X COMBO® II Programmable PCM CODEC/Filter General Description The TP3070 and TP3071 are second-generation combined PCM CODEC and Filter devices optimized for digital switch- ing applications on subscriber line and trunk cards. Using advanced switched capacitor techniques, COMBO II com- bines 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 en- able 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 im- pedances 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 net- works. 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 pro- vides 6 latches and the TP3071 5 latches. Features n Complete CODEC and FILTER system including: — Transmit and receive PCM channel filters — µ-law or A-law companding encoder and decoder — Receive power amplifier drives 300 Ω — 4.096 MHz serial PCM data (max) n Programmable Functions: — Transmit gain: 25.4 dB range, 0.1 dB steps — Receive gain: 25.4 dB range, 0.1 dB steps — Hybrid balance cancellation filter — Time-slot assignment; up to 64 slots/frame — 2 port assignment (TP3070) — 6 interface latches (TP3070) — A or µ-law — Analog loopback — Digital loopback n Direct interface to solid-state SLICs n Simplifies transformer SLIC; single winding secondary n Standard serial control interface n 80 mW operating power (typ) n 1.5 mW standby power (typ) n Designed for CCITT and LSSGR applications n TTL and CMOS compatible digital interfaces n Extended temperature versions available for −40˚C to +85˚C (TP3070V-X) Note: See also AN-614, COMBO II application guide. COMBO® and TRI-STATE® are registered trademarks of National Semiconductor Corporation. April 1994 © 1999 National Semiconductor Corporation DS008635 www.national.com |
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