Reference Design using the HC55185 and the IDT821054/64 Programmable Quad PCM CODEC
The purpose of this application note is to provide a reference design for the HC55185 and IDT821054/64 Programmable Quad PCM CODECs.
The network requirements of many countries require the analog subscriber line circuit (SLIC) to terminate the subscriber line with an impedance for voiceband frequencies which is complex, rather than resistive (e.g.). The HC55185 accomplishes this impedance matching with a single network connected between the VTX pin and the -IN pin.
The IDT821054/64 Quad PCM CODECs uses an intergrated programmable DSP to realize AC Impedance Matching, Transhybrid Balance, Frequency Response Correction and Gain Setting functions.
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Reference Design using the HC55185 and the IDT821068 Programmable Octal PCM CODEC
The purpose of this application note is to provide a reference design for the HC55185 and IDT821068 Programmable Octal PCM cODEC.
The network requirements of many countries require the analog subscriber line circuit (SLIC) to terminate the subscriber line with an impedance for voiceband frequencies which is complex, rather than resistive (e.g.). The HC55185 accomplishes this impedance matching with a single network connected between the VTX pin and the -IN pin.
The IDT821068 Octal PCM CODEC uses an integrated programmable DSP to realize AC Impedance Matching, Transhybrid Balance, Frequency Response Correction and Gain Setting functions.
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Reference Design using the HC55185 and the AK2306/2306LV Dual PCM CODEC
The purpose of this application note is to provide a reference design for the HC55185 and AK2306/2306LV Dual PCM CODEC.
The network requirements of many countries require the analog subscriber line circuit (SLIC) to terminate the subscriber line with an impedance for voiceband frequencies which is complex, rather than resistive (e.g.). The HC55185 accomplishes this impedance matching with a single network (RS Figure 1) connected between the VTX pin and the -IN pin.
The AK2306/2306LV Dual PCM CODEC includes Selectable A-law/law function, Internal Gain Adjustment from +6dB to -18dB by 1dB steps control and a selectable 16Hz/20Hz Ring Tone Generator.
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Reference Design using the HC5503PRC SLIC and the Texas Instruments TP3057A Combined PCM CODEC and Filter
The network requirements of many countries require the Analog Subscriber Line Circuit (SLIC) to terminate the subscriber line with an impedance for voiceband frequencies which is complex, rather than resistive (e.g.). This requires that the physical resistance that is situated between the SLIC and the subscriber line, comprised of protection and/or sensing resistors, and the output resistance of the SLIC itself, be adapted to present an impedance to the subscriber line that varies with frequency. This is accomplished using feedback around the SLIC.
The purpose of this application note is to show a means of accomplishing this task for the HC5503PRC and Texas Instruments TP3057A Combo.
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Reference Design using the HC5503PRC SLIC and the Texas Instruments TCM38C17 Quad Combo
The network requirements of many countries require the analog subscriber line circuit (SLIC) to terminate the subscriber line with an impedance for voiceband frequencies which is complex, rather than resistive (e.g., 600W). This requires that the physical resistance that is situated between the SLIC and the subscriber line, comprised of protection and/or sensing resistors, and the output resistance of the SLIC itself, be adapted to present an impedance to the subscriber line that varies with frequency. This is accomplished using feedback around the SLIC.
The purpose of this application note is to show a means of accomplishing this task for the HC5503PRC and Texas Instruments TCM38C17 Quad Combo.
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