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TEA1098A Arkusz danych(PDF) 10 Page - NXP Semiconductors |
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TEA1098A Arkusz danych(HTML) 10 Page - NXP Semiconductors |
10 / 40 page 2000 Mar 21 10 Philips Semiconductors Preliminary specification Speech and handsfree IC TEA1098A Fig.6 Current consumption on VDD. handbook, full pagewidth 1.0 IDD (A) 1.5 2.5 3.0 VDD (V) 2.0 100.0u 10.0u 100.0n 10.0n 1.0u 10.0p 1.0n 100.0p MGL438 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 2.0 V; it can source a 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 becomes lower than 2.7 V, the VBB detector of the receive dynamic limiter on pin LSAO acts continuously, discharging the capacitor connected to pin DLC. In the DC condition, the loudspeaker is then automatically disabled below this voltage. When VBB goes below 2.5 V, the TEA1098A is forced into 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 typically equal to 300 µA. POWER-DOWN MODE (PIN PD) To reduce consumption during dialling or register recall (flash), the TEA1098A is provided with a power-down input (PD). When the voltage on pin PD is LOW, the current consumption from VBB and VDD is reduced to 460 µA typically. Therefore a capacitor of 470 µF on VBB is sufficient to power the TEA1098A during pulse dialling or flash. The PD input has a pull-up structure. In this mode, the capacitor CREG is internally disconnected. |
Podobny numer części - TEA1098A |
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Podobny opis - TEA1098A |
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