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TEA1085T датащи(PDF) 9 Page - NXP Semiconductors |
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TEA1085T датащи(HTML) 9 Page - NXP Semiconductors |
9 / 32 page March 1992 9 Philips Semiconductors Preliminary specification Listening-in circuit for line-powered telephone sets TEA1085; TEA1085A Dynamic limiter (DLC) pin 23 To prevent distortion of the signal at the loudspeaker outputs the gain of the amplifier is reduced rapidly when: • the peaks of the signal at the loudspeaker outputs exceed an internally determined threshold (voltage limiter) • the DC current into SUP is insufficient (current limiter) • the voltage at VBB decreases below an internally determined threshold, typically 2.9 V (VBB limiter) The time in which the gain reduction is effected is the 'attack time'; this is very short in the first and third instance and relatively long in the second instance. The circuit will remain in the gain-reduced condition until the peaks of the output signal remain below the threshold level. The gain will then return to a nominal level after a time determined by the capacitor connected to DLC (release time). MUTE input (MUTE) pin 20; TEA1085A This MUTE is provided with a logic input to operate with a microcontroller for instance. The loudspeaker amplifier is disabled when the MUTE input is LOW (connected to VSS or open input). A HIGH level at the MUTE input enables the amplifier in the listening-in mode. MUTE input (MUTE) pin 20; TEA1085 The MUTE function is provided with a toggle input and is designed to switch between the standby condition and the listening-in condition on the rising edge of the input MUTE signal (see Fig.6). In the basic application the MUTE input must be LOW (connected to VSS). A simple push-button can be used to operate the MUTE toggle (see Fig.7). Debouncing can be realized by means of a small capacitor connected between MUTE and VSS. An internal start circuit ensures that the circuit always starts up in the standby condition. Fig.6 Mute toggle function of the TEA1085. handbook, full pagewidth MGR036 LSI1 QLS1 MUTE standby standby listening-in Fig.7 Mute switch alternatives with the TEA1085. handbook, full pagewidth MLA055 MUTE MUTE VBB 10 k Ω (a) Break contact. (b) Make contact. |
Аналогичный номер детали - TEA1085T |
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Аналогичное описание - TEA1085T |
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