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TEA1083A 데이터시트(PDF) 5 Page - NXP Semiconductors |
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TEA1083A 데이터시트(HTML) 5 Page - NXP Semiconductors |
5 / 20 page March 1994 5 Philips Semiconductors Product specification Call progress monitor for line powered telephone sets TEA1083; TEA1083A Table 1 Comparison of the TEA108X family. PRODUCT CONDITIONS TEA1083 TEA1083A TEA1085/85A Application area note 1 call progress monitoring listening-in PD facility − XX MUTE or LSE facility note 2 X X X Dynamic limiter −− X Howling limiter −− X VBB setting −− X SEL note 3 X X X BTL note 3 −− X Number of pins note 4 8 16 24 Notes 1. A call progress monitor is recommended by the European Telecommunications Standards Institute (ETSI) for telephone sets with automatic on-hook dialling facilities so that audible, or visual, progress of a call attempt can be monitored. In accordance with the ETSI (at a frequency of 440 Hz and a line level of 20 dBm (600 Ω)), a minimum level of 50 dBA shall be guaranteed at a distance of 50 cm from the set. This corresponds to a minimum level of approximately 100 mV (RMS) (PO ≥ 0.2 mW) across a loudspeaker; Philips type AD2071/Z50. A listening-in set has to offer the user more facilities e.g. howling limiting to reduce annoying loudspeaker and line signals. Dynamic limiting of the loudspeaker signal, with respect to supply conditions, can also be required. Acoustic output levels for listening-in sets are approximately 70 to 75 dBA. This corresponds to a loudspeaker level of approximately 1 mV (RMS) (PO ≈ 20 mW). 2. The MUTE function of the TEA1085A has a logic input; the MUTE function of the TEA1085 has a toggle input. 3. SEL: loudspeaker connected in a single-ended-load configuration BTL: loudspeaker connected in a bridge-tied-load configuration 4. Consult the product specification for the package outline/s. FUNCTIONAL DESCRIPTION The TEA1083/83A is normally used in conjunction with a transmission circuit of the TEA1060 family. The circuit must be connected between the positive line terminal (pin 2) and pin SLPE of the transmission IC. The transmission characteristics (impedance, gain settings, etc.) are not affected. An interconnection between the TEA1083/83A and a member of the TEA1060 family is illustrated in Fig.5. Supplies SUP, SREF, VBB and VSS In Fig.6 the line current is divided into ITR for the transmission IC and ISUP for the monitoring circuit TEA1083/83A. ITR is constant: ITR =Vint / R20 ISUP =Iline − ICC − ITR Where: • Vint is an internal temperature compensated reference voltage of 500 mV (typ) between pins SUP and SREF • R20 is a resistor connected between SUP and SREF • ICC is the internal current consumption of the TEA106X (approximately 1 mA). A practical value for resistor R20 is 150 Ω; this produces a current of approximately 3.3 mA (typ) for ITR and ISUP is approximately equal to Iline − 4.3 mA. |
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