TP3070, TP3071, TP3070-XCOMBO® II Programmable PCM CODEC/FilterGeneral Des criptionThe TP3070 and TP3071 are second-generation combinedPCM CODEC and Filter devices optimized for digital switchingapplications on subscriber line and trunk cards. Usingadvanced switched capacitor techniques, COMBO II combinestransmit bandpass and receive lowpass channel filterswith a companding PCM encoder and decoder. The devicesare A-law and μ-law selectable and employ a conventionalserial PCM interface capable of being clocked up to4.096 MHz. A number of programmable functions may becontrolled via a serial control port.Channel gains are programmable over a 25.4 dB range ineach direction, and a programmable filter is included to enableHybrid Balancing to be adjusted to suit a wide range ofloop impedance conditions. Both transformer and activeSLIC interface circuits with real or complex termination impedancescan be balanced by this filter, with cancellation inexcess of 30 dB being readily achievable when measuredacross the passband against standard test termination networks.To enable COMBO II to interface to the SLIC control leads, anumber of programmable latches are included; each may beconfigured as either an input or an output. The TP3070 provides6 latches and the TP3071 5 latches.
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