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TEA1093T Folha de dados(PDF) 9 Page - NXP Semiconductors |
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TEA1093T Folha de dados(HTML) 9 Page - NXP Semiconductors |
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9 / 28 page  1996 Feb 09 9 Philips Semiconductors Product specification Hands-free IC TEA1093 Fig.7 Loudspeaker channel. handbook, full pagewidth MGD222 V I −1 I V RGAR GAR LSP1 LSP2 DLC/MUTER CDLC CLSP1 1 4 6 5 to/from voice switch to envelope detector to logic RIN2 RIN1 2 3 11 from TEA106X VOL VOLUME CONTROL DYNAMIC LIMITER from voltage stabilizer RVOL Loudspeaker channel LOUDSPEAKER AMPLIFIER: PINS RIN1, RIN2, GAR, LSP1 AND LSP2 The TEA1093 has symmetrical inputs for the loudspeaker amplifier with an input resistance of 40 k Ω between RIN1 and RIN2 (2 × 20 kΩ). The input stage can accommodate signals up to 390 mV (RMS) at room temperature for 2% of total harmonic distortion (THD). The gain of the input stage varies according to the mode of the TEA1093. In the receive mode, the gain is at its maximum; in the transmit mode, it is at its minimum and in the idle mode, it is halfway between maximum and minimum. Switch-over from one mode to the other is smooth and click-free. The rail-to-rail output stage is designed to power a loudspeaker which is connected as a single-ended load (between LSP1 and GND) or as a bridge-tied load (between LSP1 and LSP2). In the receive mode, the overall gain of the loudspeaker amplifier can be adjusted from 3 dB up to 39 dB to suit specific application requirements. The gain from RIN1 or RIN2 to LSP1 is proportional to the value of RGAR and equals 18 dB with RGAR = 66.5 kΩ. The second output LSP2 is in opposite phase with LSP1. Therefore, in the basic application, the gain between RIN1-RIN2 to LSP1-LSP2 equals 24 dB typical with RGAR = 66.5 kΩ. A capacitor connected in parallel with RGAR can be used to provide a first-order low-pass filter. VOLUME CONTROL: PIN VOL The loudspeaker amplifier gain can be adjusted with the potentiometer RVOL. A linear potentiometer can be used to obtain logarithmic control of the gain at the loudspeaker amplifier. Each 950 Ω increase of RVOL results in a gain loss of 3 dB. The maximum gain reduction with the volume control is internally limited to the switching range. DYNAMIC LIMITER: PIN DLC/MUTER The dynamic limiter of the TEA1093 prevents clipping of the loudspeaker output stages and protects the operation of the circuit when the supply condition falls below a certain level. Hard clipping of the loudspeaker output stages is prevented by rapidly reducing the gain when the output stages start to saturate. The time in which gain reduction is effected (clipping attack time) is approximately a few milliseconds. The circuit stays in the reduced gain mode until the peaks of the loudspeaker signals no longer cause saturation. The gain of the loudspeaker amplifier then returns to its normal value within the clipping release time (typical 250 ms). Both attack and release times are proportional to the value of the capacitor CDLC. The total harmonic distortion of the loudspeaker output stages, in reduced gain mode, stays below 5% up to 10 dB (minimum) of input voltage overdrive [providing VRIN is below 390 mV (RMS)]. |
Nº de peça semelhante - TEA1093T |
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Descrição semelhante - TEA1093T |
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