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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TEA1069N 데이터시트(PDF) 8 Page - NXP Semiconductors |
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TEA1069N 데이터시트(HTML) 8 Page - NXP Semiconductors |
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8 / 44 page  1998 Jan 08 8 Philips Semiconductors Product specification Versatile speech/dialler/ringer with music-on-hold TEA1069; TEA1069A Fig.4 Supply arrangement. handbook, full pagewidth MBH197 SLPE STAB REG LN AC DC peripheral circuits C1 0.5 mA Rline Rexch Vexch Iline Ip R1 ICC VCC VEE ISLPE + 0.5 mA ISLPE C3 R5 R9 TEA1069 TEA1069A Thus, the regulated voltage on the line terminal (VLN) can be calculated as: , where Vref is the internally generated temperature compensated reference voltage of 3.7 V and R9 is an external resistor connected between SLPE and VEE. The circuit has an internal current stabilizer operating at a level determined by resistor R5 connected between STAB and VEE. In normal use the value of R5 would be 3.6 k Ω and the value of R9 would be 20 Ω. Changing the value of R5 or R9 will affect microphone gain, DTMF gain, gain control characteristics, sidetone level, maximum output swing on LN and the DC characteristics (especially at low line current). At line currents below 9 mA the internal reference voltage is automatically adjusted to a lower value (typically 1.6 V V LN V ref I SLPE R9 × + = I SLPE I line I CC I p 0.5 10 3 – A × ++ – = at 1 mA). This means that more sets can be operated in parallel with DC line voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.6 V. At line currents below 9 mA the circuit has limited sending and receiving levels. Under normal conditions, when ISLPE >> ICC + 0.5 mA + Ip, the static behaviour of the circuit is that of a 3.7 V regulator diode (Vref) with an internal resistance equal to that of R9. In the audio frequency range the dynamic impedance is largely determined by R1. Figure 5 shows the equivalent impedance of the circuit. Current (Ip) available from VCC for the dialler part and peripheral circuits depends on the external components used. Figure 6 shows this current for VCC > 2.2 V. When MUTE is HIGH i.e. when the receiving amplifier (supplied from VCC) is driven, the available current is further reduced. Current availability can be increased by connecting the supply IC TEA1081 in parallel with R1, or by increasing the DC line voltage by means of an external resistor (RVA = R60) connected between REG and SLPE. |
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