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TEA1064B датащи(PDF) 11 Page - NXP Semiconductors |
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TEA1064B датащи(HTML) 11 Page - NXP Semiconductors |
11 / 32 page March 1994 11 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting TEA1064B Dynamic limiter (microphone) pin DLS/MMUTE A low level at the DLS/MMUTE pin inhibits the microphone inputs MIC + and MIC− but has no influence on the receiving and DTMF amplifiers. Removing the low level at the DLS/MMUTE pin provides the normal function of the microphone amplifier after a short time determined by the capacitor connected to DLS/MMUTE pin. The microphone mute function can be realised by a simple switch as shown in Fig.11. To prevent distortion of the transmitted signal, the gain of the sending amplifier is reduced rapidly when peaks of the signal on the line exceed an internally-determined threshold. The time in which gain reduction is effected (attack time) is very short. The circuit stays in the gain-reduced condition until the peaks of the sending signal remain below the threshold level. The sending gain then returns to normal after a a time determined by the capacitor connected to DLS/MMUTE (release time). The internal threshold adapts automatically to the DC voltage setting of the circuit (VLN-SLPE). This means that the maximum output swing on the line will be higher if the DC voltage dropped across the circuit is increased. Fig.12 shows the maximum possible output swing on the line as a function of the DC voltage drop (VLN-SLPE) with Iline − Ip as a parameter. The internal threshold level is lowered automatically if the DC current in the transmit output stage is insufficient. This prevents distortion of the sending signal in applications using parallel-connected telephones or telephones operating over long lines, for example. Dynamic limiting also considerably improves sidetone performance in over-drive conditions (less distortion; limited sidetone level). Fig.11 Microphone-mute function. handbook, halfpage MBA440 R17 3.3 k Ω 7 11 DLS/MMUTE VEE1 Fig.12 Typical output swing on line as a function of the DC voltage drop VLN-SLPE with Iline − Ip as a parameter. R16 = 392 Ω. 5.5 10 0 3 3.5 4 4.5 5 2 4 6 8 VLN(p-p) (V) VLN-VSLPE (V) Iline-Ip (mA) MBA464 25 23 21 19 17 15 13 11 |
Аналогичный номер детали - TEA1064B |
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Аналогичное описание - TEA1064B |
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