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TEA1097H датащи(PDF) 10 Page - NXP Semiconductors |
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TEA1097H датащи(HTML) 10 Page - NXP Semiconductors |
10 / 36 page 1999 Apr 08 10 Philips Semiconductors Product specification Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer TEA1097 Fig.6 Current consumption on VDD. handbook, full pagewidth 1.0 IDD (pA) 1.5 2.5 3.0 VDD (V) 2.0 108 107 106 105 104 103 102 10 FCA050 SUPPLY FOR MICROPHONE (PINS MICS AND GNDTX) The MICS output can be used as a supply for an electret microphone. Its voltage is equal to 2 V; it can source current up to 1 mA and has an output impedance equal to 200 Ω. LOW VOLTAGE BEHAVIOUR For line currents below 9 mA, the reference voltage is automatically adjusted to a lower value; the VBB voltage follows the SLPE voltage with 250 mV difference. The excess current available for other purposes than DC biasing of the IC becomes small. In this low voltage area, the IC has limited performances. When the VBB voltage reaches 2.7 V, the VBB detector of the receive dynamic limiter on pin LSAO acts continuously, discharging the capacitor at pin DLC. In the DC condition, the loudspeaker is automatically disabled below this voltage. When VBB becomes lower than 2.5 V, the TEA1097 is forced in a low voltage mode whatever the levels on the logic inputs are. It is a speech mode with reduced performances only enabling the microphone channel (between the MIC inputs and LN) and the earpiece amplifier. These two channels are able to deliver signals for line currents as small as 3 mA. The HFC input is tied to GND sinking a current equal to 300 µA (typ.). POWER-DOWN MODE (PINS PD AND AUXC) To reduce current consumption during dialling or register recall (flash), the TEA1097 is provided with a power-down input (PD). When the voltage on pins PD and AUXC is LOW, the current consumption from VBB and VDD is reduced to 460 µA (typ.). Therefore a capacitor of 470 µF connected to pin VBB is sufficient to power the TEA1097 during pulse dialling or flash. The PD input has a pull-up structure, while AUXC has a pull-down structure. In this mode, the capacitor CREG is internally disconnected. |
Аналогичный номер детали - TEA1097H |
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Аналогичное описание - TEA1097H |
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