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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TEA1099 датащи(PDF) 11 Page - NXP Semiconductors |
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TEA1099 датащи(HTML) 11 Page - NXP Semiconductors |
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11 / 40 page  1999 Apr 08 11 Philips Semiconductors Product specification Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer TEA1099H EARPIECE AMPLIFIER (PINS GARX AND QR) The earpiece amplifier is an operational amplifier having its output (QR) and its inverting input (GARX) available. Its input signal comes, via a decoupling capacitor, from the receive RECO output. It is used in combination with two resistors to get the required gain or attenuation compared to the receive gain. It can be chosen between −3 and +15 dB. Two external capacitors CGAR (connected between GARX and QR) and CGARS (connected between GARX and GND) ensure stability. The CGAR capacitor provides a 1st-order low-pass filter. The cut-off frequency corresponds to the time constant CGAR × Re2. The relationship CGARS ≥ 10 × CGAR must be fulfilled. The earpiece amplifier has a rail-to-rail output QR, biased at two diodes voltage. It is designed for use with low ohmic (real) loads (150 Ω) or capacitive loads (100 nF in series with 100 Ω). AUXILIARY RECEIVE AMPLIFIER (PINS RAUX AND RECO) The auxiliary receive amplifier has an asymmetrical input RAUX; it uses the RECO output. Its input impedance between pins RAUX and GND is typically equal to 20 k Ω. The voltage gain between pins RAUX and RECO is equal to −2.4 dB. Without any limitation from the output, the input stage can accommodate signals up to 0.95 V (RMS) at room temperature for 2% of THD. This auxiliary amplifier has a rail-to-rail output RECO, which is designed for use with high ohmic (real) loads (larger than 5 k Ω). This output is biased at two diodes voltage. The automatic gain control has no effect on this channel. Auxiliary amplifiers using AUXO (pins MIC+, MIC −, HFTX, IR and AUXO) The TEA1099H has an auxiliary output AUXO, biased at two diodes voltage. This output stage is a rail-to-rail one, designed for use with high ohmic (real) loads (larger than 5k Ω). The AUXO output amplifier is used in three different channels, two transmit channels and one receive channel. AUXILIARY AMPLIFIERS USING THE MICROPHONE INPUTS (PINS MIC+, MIC − AND AUXO) The auxiliary transmit amplifier using the microphone MIC+ and MIC − inputs has a gain of 25.5 dB referenced to AUXO. Without limitation from the output, the input stage can accommodate signals up to 16 mV (RMS) at room temperature for 2% of THD. The automatic gain control has no effect on this channel. AUXILIARY AMPLIFIERS USING HFTX (PINS HFTX AND AUXO) The auxiliary transmit amplifier using the HFTX input has a gain of 15.2 dB referenced to AUXO. The automatic gain control has no effect on this channel. RX AMPLIFIER USING IR (PINS IR AND AUXO) The auxiliary receive amplifier uses pin IR as input. The input is referred to LN and the DC biasing between these two pins is one diode voltage. The voltage gain between the input IR (referenced to LN) and the output AUXO is typically equal to 32.8 dB, which compensates typically the attenuation provided by the anti-sidetone network. Automatic gain control is provided for line loss compensation. AGC (pin AGC) The TEA1099H performs automatic line loss compensation, which fits well with the true line attenuation. The automatic gain control varies the gain of some transmit and receive amplifiers in accordance with the DC line current. The control range is 6.45 dB for Gv(MIC-LN), Gv(IR-RECO) and Gv(IR-AUXO) and 6.8 dB for the other affected channels, which corresponds approximately to a line length of 5.5 km for a 0.5 mm twisted-pair copper cable. To enable this gain control, the AGC pin must be shorted to pin LN. The start current for compensation corresponds to a line current equal to typically 23 mA and the stop current to 57 mA. The start current can be increased by connecting an external resistor between pins AGC and LN. It can be increased up to 40 mA (using a resistor typically equal to 80 k Ω). The start and stop current will be maintained in a ratio equal to 2.5. By leaving the AGC pin open-circuit, the gain control is disabled and no line loss compensation is performed. |
Аналогичный номер детали - TEA1099 |
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Аналогичное описание - TEA1099 |
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